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A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Odontoblast
Cells which produce dentin in the tooth pulp
Olfactory mucosa
Mucosa lining parts of the nasal cavity
Oligodendrocyte
Glial cell in the CNS which wraps around axons to form myelin sheaths
Oocyte
Developing female gamete; immature ovum
Optic disc
The area of the retina that the optic nerve leaves from; responsible for the blind spot
Ora serrata
Junction between the ciliary body and the retina
Organ of Corti
Part of the cochlea; houses the auditory sensory receptors
Organelle
Specialized intracellular structure
Osteoblast
Bone forming cell
Osteoclast
Multinucleated cell which breaks done bone matrix
Osteocyte
Mature bone cell
Osteoid
Bone matrix which is unmineralized
Osteon
Structural unit in mature bone consisting of concentric layers of bone lamellae around the central canal
Ova
Mature female gamete
Oxyntic cell
Also called a parietal cell. Cell found in the stomach which produces hydrochloric acid and intrinsic factor
Oxyphilic cell
One of the two main cell types found in the parathyroid gland
Oxytalan fibers
Fibers in the periodontal ligament
Pacinian corpuscle
Mechanoreceptor for pressure
Pampiniform plexus
Venous plexus found in the reproductive system
Paneth cells
Cells with prominent granules found in the deepest part of an intestinal gland
Papillary layer
Superficial layer of the dermis
Parafollicular cells
Cell type in a thyroid follicle which secretes calcitonin; also called a C cells
Parenchyma
The functional portion of an organ
Parakeratinized epithelium
Keratinized epithelium where the cells still have their nuclei
Parietal cell
Also called a oxyntic cell. Found in the stomach; produces HCl and intrinsic factor
Pars convoluta
Distal convoluted tubule
Pars distalis
Anterior lobe of the pituitary
Pars intermedia
Intermediate lobe of pituitary
Pars nervosa
Posterior lobe of pituitary
Pars recta
Proximal straight tubule in the kidney
Pars tuberalis
Portion of adenohypophysis around infundibuluar stem
Pedicel
Foot process of a podocyte
Peg cells
Non-ciliated secretory cells found in the oviduct
Periarterial lymphatic sheath
PALS; cluster of lymphoctes surrounding a central artery of the spleen
Perichondrium
Connective tissue covering which surrounds cartilage
Pericyte
An undifferentiated cell seen in association with some capillaries
Perikaryon
The cell body of a nerve cell
Perimetrium
Covering of the uterus
Perimysium
Connective tissue sheath surrounding muscle fascicles
Perineurium
Connective tissue sheath surrounding nerve fibers
Periodontium
Supporting tissue of the teeth
Periosteum
Connective tisue covering of bone
Peyer's patches
Lymphoid nodules seen in the lamina propria of the large intestine and appendix
Phagocytosis
Form of endocytosis; "cell eating''
Phalangeal cells
Supporting cells of the spiral organ
Pillar cells
Cell type found in the organ of Corti
Pinocytosis
A form of endoctyosis in which fluids enter the cell; 'cell drinking'
Pituicyte
Cell type found in the neurohypophysis
Plasma cell
Cell derived from B lymphoctyes which secretes antibodies
Plasma membrane
The cell membrane
Plasmalemma
The cell membrane
Platelet
Cell fragment in blood which is involved in clotting
Pleomorphic
Having a variety of shapes and sizes
Pneumocyte
Cell of the pulmonary alveoli
Podocytes
Octopus shaped cells which surround glomerular capillaries
Polychromatophilic erythroblast
Immature cell in the development of the red blood cell
Polychromatophilic erythrocyte
Reticulocyte
Polymorph
PMN; neutrophil
Polymorphonuclear leukocyte
PMN; neutrophil
Pores of Kohn
Channels between adjacent alveoli
Portal triad
Seen in the liver; branch of the hepatic artery, hepatic portal vein, and bile duct
Predentin
Matrix of dentin
PP cells
Cells of the pancreas which secrete pancreatic polypeptide
Preosteoblast
Osteoprogenitor cell; cell which will differentiate into osteoblast
Presynaptic membrane
Region of a nerve cell abutting the synaptic cleft
Primary follicle
Follicular stage where the primary oocyte is surrounded by cuboidal cells
Primary nodule
Aggregation of small lymphocytes
Primordial follicle
Primitive follicle
Principal cell
1. Parathyroid cell which secretes parathyroid hormone
2. Cell type in the thyroid; follicular cells
Proerythroblast
Immature cell in the development of the red blood cell
Promyelocyte
Primitive cell in granulopoiesis
Prostatic concretions
Corpora amylaceae; eosinophilic bodies seen in the prostate
Proximal convoluted tubule
PCT, part of the nephron
Psammoma body
Concentric whorls seen in choroid plexus, meninges, pineal gland, and some tumors
Pseudopod
Non permanent project of the cytoplasm of a cell
Pseudostratified epithelium
A type of epithelium where all cells touch the basement membrane yet has the appearance of being stratified
Pseudounipolar neuron
Unipolar neuron
Purkinje cells
Cell type in the cerebellum
Purkinje fibers
Specialized cardiac muscle fibers inolved in the transmission of the impulse from the atrioventricular node to the ventricles
Pyramidal cells
Neurons in the cerebral cortex with a cell body shaped like a pyramid
Histology hint from Sarah Bellham: If you are studying histology or involved in health care, you need a medical dictionary. You may as well get one as early in your career as possible to maximize the benefit. I recommend: Stedman's Medical Dictionary or Dorland's Illustrated Medical Dictionary, 30th Edition .
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