Cell and Tissue Biology

Objects

All labeled objects are listed alphabetically. Click the appropriate letter below and then on an object name...

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Object names starting with "P":

Object Name # of Images Description
Pacinian corpuscle 1 Encapsulated sensory receptor. Composed of several layers of concentric fibroblasts and a centrally-located unmyelinated nerve ending. Believed to sense vibration and pressure.
Pacinian corpuscle 1 Encapsulated sensory receptor. Composed of several layers of concentric fibroblasts and a centrally-located unmyelinated nerve ending. Believed to sense vibration and pressure.
Pacinian corpuscles 1 Encapsulated sensory receptors. Composed of several layers of concentric fibroblasts and a centrally-located unmyelinated nerve ending. Believed to sense vibration and pressure.
Pacinian corpuscles 1 Encapsulated sensory receptors. Composed of several layers of concentric fibroblasts and a centrally-located unmyelinated nerve ending. Believed to sense vibration and pressure.
Palpebral conjunctiva 1 Conjunctiva lining the inside of the eyelid. Composed of nonkeratinized epithelium.
Pancreatic acinus 1 Composed of exocrine pancreatic cells. A supracellular unit of organization.
Pancreatic polypeptide-producin 1 (Self-explanatory)
Papilla (connective tissue) 1 In this case, connective tissue core of a hair follicle.
Papilla (connective tissue) 1 In this case, connective tissue core of a hair follicle.
Papillary muscle 1 Cardiac muscle attached to mitral and tricuspid valves of the heart via chordae tendinae. Prevents valves from turning inside-out.
Parathyroid cells 1 Chief cells of the parathyroid gland. Produce PTH which prevents hypocalcemia.
Parathyroid gland 1 Four glands located at the posterior surface of the thyroid, or, like this view, embedded in it. Essential for life.
Parathyroid tissue 1 Chief cells of the parathyroid gland. Produce PTH which prevents hypocalcemia.
Parathyroid tissue 1 Chief cells of the parathyroid gland. Produce PTH which prevents hypocalcemia.
Parietal cell 1 Cell producing HCl and intrinsic factor in the fundic stomach. Large eosinophilic cell. Contains many mitochondria and an intracellular canaliculus. Stimulated by ACh, gastrin, and histamine. Inhibited by somatostatin. Also called oxyntic cell.
Parietal cell 1 Cell producing HCl and intrinsic factor in the fundic stomach. Large eosinophilic cell. Contains many mitochondria and an intracellular canaliculus. Stimulated by ACh, gastrin, and histamine. Inhibited by somatostatin. Also called oxyntic cell.
Parietal cells 1 Cells producing HCl and intrinsic factor in the fundic stomach. Large eosinophilic cells. Contain many mitochondria and an intracellular canaliculus. Stimulated by ACh, gastrin, and histamine. Inhibited by somatostatin. Also called oxyntic cells.
Parietal cells 1 Cells producing HCl and intrinsic factor in the fundic stomach. Large eosinophilic cells. Contain many mitochondria and an intracellular canaliculus. Stimulated by ACh, gastrin, and histamine. Inhibited by somatostatin. Also called oxyntic cells.
Parietal cells 3 Cells producing HCl and intrinsic factor in the fundic stomach. Large eosinophilic cells. Contain many mitochondria and an intracellular canaliculus. Stimulated by ACh, gastrin, and histamine. Inhibited by somatostatin. Also called oxyntic cells.
Pars intermedia 2 Intermediate lobe of the hypophysis. Rudimentary in adult humans, but probably stimulates the adrenal cortex in the fetus. Well-developed in rodents.
Pars intermedia 1 Intermediate lobe of the hypophysis. Rudimentary in adult humans, but probably stimulates the adrenal cortex in the fetus. Well-developed in rodents.
Pars tuberalis (hypophysis) 1 This is a part of the anterior (adeno-) hypophysis. Surrounds the pituitary stalk of the neurohypophysis.
Pepsinogen-secreting cell 1 Also called chief cell. Basophilic cell (plenty of RER) located at the base of the fundic gland in the stomach. Produces zymogen giving rise to pepsin upon cleavage by HCl in the stomach.
Pericardial epithelium 1 Simple squamous epithelium with microvilli. Lines the pericardium.
Pericardium 1 Composed of simple squamous epithelium and connective tissue. Delimits the heart. The pericardium has two layers, epicardium, which covers the myocardium, and the pericardial sac.
Pericardium 1 Composed of simple squamous epithelium and connective tissue. Delimits the heart. The pericardium has two layers, epicardium, which covers the myocardium, and the pericardial sac.
Pericardium 1 Composed of simple squamous epithelium and connective tissue. Delimits the heart. The pericardium has two layers, epicardium, which covers the myocardium, and the pericardial sac.
Pericardium 1 Composed of simple squamous epithelium and connective tissue. Delimits the heart. The pericardium has two layers, epicardium, which covers the myocardium, and the pericardial sac.
Perichondrium 2 Surrounds the cartilage like a capsule. Contains chondrogenic cells.
Perichondrium 1 Surrounds the cartilage like a capsule. Contains chondrogenic cells.
Perichondrium 1 Surrounds the cartilage like a capsule. Contains chondrogenic cells.
Perichondrium 3 Surrounds the cartilage like a capsule. Contains chondrogenic cells.
Pericyte 1 A pluripotential cell surrounding blood vessels, particularly numerous around post-capillary venules.
Pericyte 1 A pluripotential cell surrounding blood vessels, particularly numerous around post-capillary venules.
Pericyte 1 A pluripotential cell surrounding blood vessels, particularly numerous around post-capillary venules.
Pericyte foot process 1 A process of a pluripotential cell surrounding blood vessels, particularly numerous around post-capillary venules.
Pericyte nucleus 2 Prominent membrane-bounded organelle in a eukaryotic cell containing DNA. Site of synthesis of various RNA's.
Pericyte nucleus 1 Prominent membrane-bounded organelle in a eukaryotic cell containing DNA. Site of synthesis of various RNA's.
Pericytes 1 Pluripotential cells surrounding blood vessels, particularly numerous around post-capillary venules.
Pericytes 1 Pluripotential cells surrounding blood vessels, particularly numerous around post-capillary venules.
Pericytes, venule 1 Pluripotential cells surrounding blood vessels, particularly numerous around post-capillary venules.
Perikarya of Sertoli cells 1 Sertoli cells are large cells extending from the basal lamina to the lumen of seminiferous tubules. Because the cell processes are so thin, they may not appear in the LM and only the cytoplasm surrounding their nuclei is seen.
Perikaryon 1 Usually refers to neurons. The nucleus and the cytoplasm surrounding it.
Perineurium 1 A connective tissue sheath surrounding several nerve fibers.
Perineurium 1 A connective tissue sheath surrounding several nerve fibers.
Periochondrosteum 1 This is the cartilage end of a rib. Contains cells that give rise to both cartilage and bone.
Periosteum 1 Contains cells that originate in bone marrow stroma and that give rise to osteoblasts.
Periosteum 1 Contains cells that originate in bone marrow stroma and that give rise to osteoblasts.
Periosteum 1 Contains cells that originate in bone marrow stroma and that give rise to osteoblasts.
Peripheral nerve branch 1 In this instance, comes to the spinal ganglion from the periphery. Could apply to sensory ganglia in CNS, or any branch of a peripheral nerve.
Peripheral nerve branch 1 In this instance, comes to the spinal ganglion from the periphery. Could apply to sensory ganglia in CNS, or any branch of a peripheral nerve.
Peripheral nuclei 1 Skeletal muscle fibers have several nuclei located on the periphery. Smooth and cardiac muscle fibers typically have a single nucleus located centrally.
Peritoneal layer 1 Some parts of the intestine are covered with peritoneum which is a thin connective tissue layer lined by mesothelium.
Peritoneum 1 Some parts of the intestine are covered with peritoneum which is a thin connective tissue layer lined by mesothelium.
Peroxisome 1 A peroxisome is an organelle containing oxidative enzymes typically using free-radical mechanisms. To distinguish between lysosomes and peroxisomes, one needs to use histochemical methods.
Peroxisomes and lysosomes 1 Lysosomes are organelles of intracellular digestion. Peroxisomes are organelles containing oxidative enzymes typically using free-radical mechanisms. To distinguish between lysosomes and peroxisomes, one needs to use histochemical methods.
Peyer's patch 1 A lymphoid aggregation in the ileum.
Peyer's patches 1 Lymphoid aggregations in the ileum.
Phagocytosed erythrocytes 1 It is thought that 30% of the macrophages of the liver are specialized for destruction of worn-out erythrocytes.
Phagolysosomes 1 Lysosomes that have engulfed material and are probably in the process of digesting it.
Phagolysosomes w/ membrane 1 Lysosomes that have engulfed material and are probably in the process of digesting it.
Phagosomes 1 Endocytotic vesicles formed by infolding of the plasma membrane at a coated pit.
Phagosomes 1 Endocytotic vesicles formed by infolding of the plasma membrane at a coated pit.
Photoreceptor layer 1 The inner and outer segments of rods and cones are located here.
Photoreceptor layer 1 The inner and outer segments of rods and cones are located here.
Photoreceptors (rods) 1 The rat is a nocturnal animal lacking cones.
Pia mater 2 This is the innermost of the three protective connective tissue layers of the central nervous system.
Pia mater 1 This is the innermost of the three protective connective tissue layers of the central nervous system.
Pia mater 3 This is the innermost of the three protective connective tissue layers of the central nervous system.
Pigment epithelium 1 Innermost layer of choroid proper. Microvilli of pigment epithelium surround the outer segments of rods and cones. However, there are NO anatomical connections between the pigment epithelium and retina. Epithelial cells are phagocytic.
Pigmented epithelium 1 Outermost of the two epithelial layers of the ciliary body. Other pigmented epithelia exist.
Pineal capsule 1 Connective tissue capsule surrounding the pineal gland.
Pinealocyte (active?) 1 A large pinealocyte may be more active. Resembles a neuron structurally.
Pinealocyte nuclei 1 Lighter staining than glial cell nuclei, a fact aiding in identification.
Pinealocyte nuclei 1 Lighter staining than glial cell nuclei, a fact aiding in identification.
Pinealocyte nuclei 1 Lighter staining than glial cell nuclei, a fact aiding in identification.
Pinealocytes 1 Produce melatonin. Involved in our biological clocks. Have indirect connections to the retina.
Pinocytotic vesicle w/ clathrin 1 Pinocytotic vesicles arise from indentation of the plasma membrane at clathrin-coated pits. Thought to be active in imbibing liquids and in intracellular and transcellular transport.
Pinocytotic vesicle w/ clathrin 1 Pinocytotic vesicles arise from indentation of the plasma membrane at clathrin-coated pits. Thought to be active in imbibing liquids and in intracellular and transcellular transport.
Pinocytotic vesicles 2 Pinocytotic vesicles arise from indentation of the plasma membrane at coated pits. Thought to be active in imbibing liquids and in intracellular and transcellular transport.
Pit 1 Indentation of the surface epithelium of the stomach. Several mucosal glands open into one pit. The pits are shallower in fundic than in cardiac or pyloric stomach.
Pits 1 Indentations of the surface epithelium of the stomach. Several mucosal glands open into one pit. The pits are shallower in fundic than in cardiac or pyloric stomach.
Pits 1 Indentations of the surface epithelium of the stomach. Several mucosal glands open into one pit. The pits are shallower in fundic than in cardiac or pyloric stomach.
Pituicyte nuclei 1 Similar to other glia, usual stains show only the nuclei.
Pituicytes 1 Similar to other glia, usual stains show only the nuclei.
Placental barrier 1 Composed of the fetal endothelium and the syncytiotrophoblast and their fused basal laminae. The maternal blood bathes the syncytiotrophoblast only.
Placental villi 1 Finger-like processes of placenta. Increase the surface for both gas and nutrient exchange.
Placental villi 1 Finger-like processes of placenta. Increase the surface for both gas and nutrient exchange.
Plasma cell 1 Specialized end state of a B lymphocyte. Produces antibodies. A given cell produces only one kind of antibody.
Plasma cells 3 Specialized end states of B lymphocytes. Produce antibodies. A given cell produces only one kind of antibody.
Plasma cells 1 Specialized end states of B lymphocytes. Produce antibodies. A given cell produces only one kind of antibody.
Plasma cells 3 Specialized end states of B lymphocytes. Produce antibodies. A given cell produces only one kind of antibody.
Plasma membrane 1 Delimits cell and regulates exchange of materials between the cell and the extracellular fluid. Contains receptors for hormones and other signals.
Platelet 2 Round or oval biconvex, anucleate corpuscle involved in blood clotting. Fragment of megakaryocytes. Produces growth factors and other factors.
Platelet 1 Round or oval biconvex, anucleate corpuscle involved in blood clotting. Fragment of megakaryocytes. Produces growth factors and other factors.
Platelet (inactive) 1 A round or oval biconvex, anucleate corpuscle involved in blood clotting. Fragments of megakaryocytes. Produce growth factors and other factors.
Platelets 2 Round or oval biconvex, anucleate corpuscles involved in blood clotting. Fragments of megakaryocytes. Produce growth factors and other factors.
Platelets 3 Round or oval biconvex, anucleate corpuscles involved in blood clotting. Fragments of megakaryocytes. Produce growth factors and other factors.
Platelets (clump) 1 Round or oval biconvex, anucleate corpuscles involved in blood clotting. Fragments of megakaryocytes. Produce growth factors and other factors. They often occur in clumps in a blood smear.
Pleura 2 The serous membrane lining the lung and the interior of the thoracic cavity. Composed of connective tissue and mesothelium.
Podocyte 1 Specialized epithelial cells of the kidney glomerulus. Participate in filtration.
Podocyte foot processes 1 A process of specialized epithelial cells of the kidney glomerulus. Participate in the filtration process.
Pore of Kohn 1 A small opening between two alveoli. Provides communication between neighboring alveoli, but, unfortunately, also an avenue for infection.
Portal area 2 Contains a branch of the portal vein, hepatic artery, and the bile duct.
Portal vein 1 Branch of the portal vein, the vein collecting blood from the GI tract, pancreas, and spleen. It provides approximately 75% of the blood supply to the liver.
Portal vein 1 Branch of the portal vein, the vein collecting blood from the GI tract, pancreas, and spleen. It provides approximately 75% of the blood supply to the liver.
Portal vein 1 Branch of the portal vein, the vein collecting blood from the GI tract, pancreas, and spleen. It provides approximately 75% of the blood supply to the liver.
Portal vein 3 Branch of the portal vein, the vein collecting blood from the GI tract, pancreas, and spleen. It provides approximately 75% of the blood supply to the liver.
Portal veins 1 Branches of the portal vein, the vein collecting blood from the GI tract, pancreas, and spleen. Portal veins provide approximately 75% of the blood supply to the liver.
Posterior epithelia 1 The dorsal (posterior) surface of the iris has two layers of epithelia, both of which are pigmented. The anterior of these two is at the same time the dilator pupillae muscle.
Posterior pigment epithelium 1 Pigmented epithelium lining the posteriormost side of the iris.
Posterior surface 1 In this instance, the pigmented epithelia lining the posterior side of the iris. Labeled for orientation purposes.
Primary follicle 1 A stage of follicle development in the ovary. Consists of the primary oocyte surrounded by one or more layers of cuboidal follicular cells.
Primary oocyte 1 The nucleus of the primary oocyte contains a diploid number of chromosomes in dictyotene stage. During ovulation the primary oocyte undergoes its first meiotic division resulting in the secondary oocyte and first polar body.
Primary oocyte 1 The nucleus of the primary oocyte contains a diploid number of chromosomes in dictyotene stage. During ovulation the primary oocyte undergoes its first meiotic division resulting in the secondary oocyte and first polar body.
Primary oocyte 1 The nucleus of the primary oocyte contains a diploid number of chromosomes in dictyotene stage. During ovulation the primary oocyte undergoes its first meiotic division resulting in the secondary oocyte and first polar body.
Primary oocyte 1 The nucleus of the primary oocyte contains a diploid number of chromosomes in dictyotene stage. During ovulation the primary oocyte undergoes its first meiotic division resulting in the secondary oocyte and first polar body.
Primary spermatocyte 1 The daughter cell of spermatogonia type B. In the course of its differentiation it duplicates its DNA content, becoming 4n, and moves closer to the lumen. The largest cell of spermatogenesis. Usually shows coarse chromatin.
Primary spermatocyte 1 The daughter cell of spermatogonia type B. In the course of its differentiation it duplicates its DNA content, becoming 4n, and moves closer to the lumen. The largest cell of spermatogenesis. Usually shows coarse chromatin.
Primary spermatocytes 1 The daughter cells of spermatogonia type B. In the course of their differentiation they duplicate their DNA content, becoming 4n, and move closer to the lumen. The largest cells of spermatogenesis. Usually show coarse chromatin.
Primary spermatocytes 1 The daughter cells of spermatogonia type B. In the course of their differentiation they duplicate their DNA content, becoming 4n, and move closer to the lumen. The largest cells of spermatogenesis. Usually show coarse chromatin.
Primary spermatocytes 1 The daughter cells of spermatogonia type B. In the course of their differentiation they duplicate their DNA content, becoming 4n, and move closer to the lumen. The largest cells of spermatogenesis. Usually show coarse chromatin.
Primary(multilaminar) follicles 1 While the primary follicle develops the follicular cells become several layers thick and the whole follicle, including the oocyte, enlarges.
Primitive dental papilla 1 During tooth development the mesodermal and neural crest cells form a papilla underneath the enamel organ.
Primitive dental papilla 1 During tooth development the mesodermal and neural crest cells form a papilla underneath the enamel organ.
Primordial follicle 1 A primary oocyte surrounded by a single layer of flattened follicular cells. At birth there are about 200,000 primordial follicles in the ovary.
Primordial follicle 1 A primary oocyte surrounded by a single layer of flattened follicular cells. At birth there are about 200,000 primordial follicles in the ovary.
Proliferating alveoli 1 During early pregnancy the alveoli in the breast increase in number and develop.
Proliferating mammary alveoli 1 During early pregnancy the alveoli in the breast increase in number and develop.
Prostatic alveolus 1 The secretory unit of the prostate. They are called alveoli because they sometimes appear as large, open spaces.
Prostatic concretion 1 Believed to originate as condensations of prostatic secretions around fragments of desquamated epithelial cells. Contain proteins, nucleic acids, cholesterol, and calcium salts.
Prostatic epithelium 1 Simple cuboidal or columnar epithelium lining the lumen of prostatic alveoli.
Prostatic epithelium 1 Simple cuboidal or columnar epithelium lining the lumen of prostatic alveoli.
Prostatic gland c.s. 1 Irregularly shaped tubuloalveolar glands located around the male urethra. The stroma contains abundant smooth muscle.
Prostatic gland epithelium 1 Simple cuboidal or columnar epithelium lining the lumen of prostatic alveoli. Epithelial cells produce prostatic secretions.
Prostatic gland lumen 1 The prostatic gland lumen appears irregular due to the folds in the mucosa.
Prostatic gland lumen 2 The prostatic gland lumen appears irregular due to the folds in the mucosa.
Prostatic gland lumina 1 The prostatic gland lumina appear irregular due to the folds in the mucosa.
Prostatic glands 1 Irregularly shaped tubuloalveolar glands located around the male urethra. The stroma contains abundant smooth muscle.
Proximal convoluted tubules 1 Located in the kidney cortex. Segment of a nephron situated between the renal corpuscle and the beginning of the loop of Henle. Is the only tubule in the kidney having a microvillous border, a help in identification. Lining cells contain glycogen.
Proximal nerve branch 1 Goes from spinal ganglion to spinal cord in this instance. Contains the true axons of sensory neurons.
Proximal tubule 1 Starts at the urinary pole of the renal corpuscle. Columnar epithelium with a brush border. Resorbs sodium from primary filtrate. Pinocytotic vesicles formed at the apical surface reclaim macromolecules from primary filtrate.
Proximal tubule lumen 2 Note the presence of the microvillous border of the epithelium at the edge of the lumen.
Proximal tubule lumina 1 Note the presence of the microvillous border of the epithelium at the edges of the lumina.
Proximal tubule lumina 1 Note the presence of the microvillous border of the epithelium at the edges of the lumina.
Pseudostratified epithelium 1 Type of epithelium composed of tall columnar, ciliated cells, goblet cells, and nondifferentiated basal cells. All cells reach the basal lamina even though this epithelium may appear to be stratified.
Pseudostratified epithelium 1 Type of epithelium composed of tall columnar, ciliated cells, goblet cells, and nondifferentiated basal cells. All cells reach the basal lamina even though this epithelium may appear to be stratified.
Pseudostratified epithelium 3 Type of epithelium composed of tall columnar, ciliated cells, goblet cells, and nondifferentiated basal cells. All cells reach the basal lamina even though this epithelium may appear to be stratified.
Pseudounipolar processes 1 These sensory neurons have only one process which soon divides into a central and a peripheral branch. Both branches are myelinated.
Pulmonary artery 1 Carries deoxygenated blood from the heart to the lungs.
Pulmonary vein 1 Carries oxygenated blood from the lungs to the heart.
Pulmonary vein 2 Carries oxygenated blood from the lungs to the heart.
Pulmonary vessel 1 In the lung both arteries and veins have rather thick walls. Therefore distinguishing between them can sometimes be difficult, particularly for the smaller branches.
Pulmonary vessel lumen 1 (Self-explanatory)
Pulmonary vessel lumen 1 (Self-explanatory)
Pulmonary vessel wall 1 In the lung both arteries and veins have rather thick walls. Therefore distinguishing between them can sometimes be difficult, particularly for the smaller branches.
Pulmonary vessels 1 In the lung both arteries and veins have rather thick walls. Therefore distinguishing between them can sometimes be difficult, particularly for the smaller branches.
Pulmonary vessels 2 In the lung both arteries and veins have rather thick walls. Therefore distinguishing between them can sometimes be difficult, particularly for the smaller branches.
Pulp cavity 1 Serves as blood and nerve supply for the tooth. In this ground specimen the contents cannot be seen because they were lost in preparation. This section is oblique and only part of the cavity can been seen.
Purkinje cell 1 Largest cell type in the cerebellar cortex. Has an elaborate dendritic tree located in the molecular layer.
Purkinje cell 1 Largest cell type in the cerebellar cortex. Has an elaborate dendritic tree located in the molecular layer.
Purkinje cell body 1 These are the largest cell bodies in the cerebellum.
Purkinje cell body 1 These are the largest cell bodies in the cerebellum.
Purkinje cells 1 Largest cell types in the cerebellar cortex. An elaborate dendritic tree is located in the molecular layer.
Purkinje fiber nucleus 1 Nucleus of highly-specialized cardiac muscle cell designed for conduction. The cell cytoplasm contains much glycogen (which dissolves during tissue preparation).
Purkinje fibers 1 Highly-specialized cardiac muscle cells designed for conduction. Contain much glycogen (which dissolves during tissue preparation).
Purkinje fibers 1 Highly-specialized cardiac muscle cells designed for conduction. Contain much glycogen (which dissolves during tissue preparation).
Purkinje fibers 2 Highly-specialized cardiac muscle cells designed for conduction. Contain much glycogen (which dissolves during tissue preparation).
Purkinje fibers c.s. 1 Highly-specialized cardiac muscle cells designed for conduction. Contain much glycogen (which dissolves during tissue preparation).
Pyramidal cells 1 This is a Golgi preparation of the cerebral cortex. Note the shape of the perikaryon. Note the orientation of the apical dendrite and the basal dendrites.
Pyramidal cells 1 This is a Golgi preparation of the cerebral cortex. Note the shape of the perikaryon. Note the orientation of the apical dendrite and the basal dendrites.

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