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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
Ranvier's node
Area between two Schwann cells which is not covered by myelin
Red blood cell
Erythrocyte
Red fiber
Type of muscle fiber which make up slow twitch motor units
Red pulp
Tissue in the spleen composed of splenic sinuses and splenic cords
Reinke crystals
Crystals seen in the interstitial cells of Leydig
Renal columns
Kidney tissue which is between the pyramids
Renal corpuscle
Glomerulus and Bowman's capsule
Residual body
Accumulation of indigestable matter within a cell
Respiratory bronchiole
First portion of the respiratory tract where gas exchange actually occurs
Rete ovarii
Fetal remnants within the ovary
Rete testis
Tubules within the testis
Rete peg
Regions in the skin where the stratum germinativum projects downward into the dermis
Reticular
Network
Reticular fiber
Type of fiber made of collagen
Reticular layer
Deeper region within the dermis
Reticuloctye
Immature erythrocyte (RBC); also called polychromatophilic erythrocyte
Reticuloendothelial system
Component of the immune system consisting of the phagocytic cells within the reticular connective tissue
Retina
The sensory tunic of the eye
Ribosome
Cytoplasmic organelle which produces proteins
RNA
Ribonucleic acid
Rod cell
Type of photoreceptors in the retina
Rokitansky-Aschoff sinuses
Diverticula seen in the mucosa of the gallbladder
Rough endoplasmic reticulum
Endoplasmic reticulum which is studded with ribosomes
Ruffini's corpuscle
Tactile receptor responsive to continuous pressure
Ruffled border
Plasma membrane foldings on an osteoclast
Sarcolemma
Plasma membrane of a muscle cell
Sarcomere
Functional unit in a muscle cell; Z line to Z line
Sarcoplasm
Cytoplasm of a muscle cell
Sarcoplasmic reticulum
The endoplasmic reticulum in a muscle cell
Satellite cells
Cells found in skeletal muscle which are dormant stem cells
Scala tympani
Chamber within the the cochlear duct
Scala vestibuli
Chamber within the the cochlear duct
Schlemm's canal
Circular canal near the junction of the cornea and sclera which allows the aqueous humor to drain from the anterior chamber
Schmidt-Lanterman cleft
Cytoplasm of a Schwann cell
Schwann cells
Cells which form the myelin sheath in the peripheral nervous system
Sebaceous gland
Gland which produces and secrete sebum
Sebum
Oily secretion
Secondary follicle
Antral follicle; follicle after the fluid filled antrum forms
Seminiferous tubules
Tubules where spermatozoa mature
Septal cell
Type II alveolar cell
Serosa
Lining of closed body cavities
Serous cell
Cell which secretes watery secretion containing enzymes
Serous demilune
Serous cell which is a moon shaped cap resting on a mucous secreting cell in a salivary gland
Sertoli cells
Supporting cells in the testes
Sharpey's fibers
Collagen fibers in bone; peforating fibers
Simple epithelium
Epithelium consisting of a single layer of cells
Simple gland
A gland with an unbranched duct or no duct
Sinusoid
Wide, leaky capillary
Slit pore
Opening between the foot processes of podocytes in the kidney
Small alveolar cell
Type I alveolar cell
Small granule cell
Argyrophilic cell or dense core granule cell
Smoth endoplasmic reticulum
Endoplasmic reticulum that is not studded with ribosomes
Smudge cell
A fragmented white blood which became fragmented while making the peripheral blood smear slide
Smooth muscle
iInvoluntary muscle which does not have cross striations
Soma
Cell body of a neuron
Somatotroph
Cell type found in the adenohypophysis which secretes growth hormone
Space of Disse
Perisinuoidal space seen in the liver
Space of Mall
Space seen in the liver at the periphery of a portal canal
Spermatid
Spermatogenic cell
Spermatocyte
Spermatogenic cell
Spermatogonia
Spermatogenic cell
Spermatozoa
Mature sperm cell
Spicules
Trabeculae seen in spongy bone
Splenic cords
Cords of Billroth; tissue between the splenic sinuses
Spongy bone
Cancellous bone; trabecular bone
Squamocolumnar junction
Transition region between the exocervix and endocervix where the epithelium changes from stratified squamous to simple columnar
Squamous
Flat
Squamous epithelium
Epithelium where the surface cells are flat; can be either simple or stratified
Stab
Immature neutrophil in which the nucleus is not yet multi-lobed; also called a band cell
Stellate
Shaped like a star
Stem cell
Undifferentiate precursor cell
Stereocilia
Very long microvilli found on some epithelial cells
Stratified epithelium
Epithelium composed of more than one layer of cells
Stratum
Layer
Stratum basale
1. Basal layer of the epidermis; also called the stratum germinativum
2. Basal layer of the endometrium
Stratum corneum
Most external layer of the epidermis; also called the horny layer
Stratum functionalis
Portion of the endometrium which is shed monthly
Stratum germinativum
Basal layer of the epidermis; also called stratum basale
Stratum granulosum
Granular layer of the epidermis
Stratum lucidum
Clear layer of the epidermis; found only in thick skin
Stratum spinosum
Spiny layer of the epidermis
Stratum vasculare
Central layer in myometrium
Striated border
Visible effect of the microvilli in the small intestine; also called the brush border
Striated duct
Duct with infoldings of plasma membrane and mitochondria as to give it a striped appearance
Stria vascularis
Part of the wall of the cochlear duct
Striated muscle
Skeletal muscle and cardiac muscle
Stroma
The supporting tissue in an organ, i.e the blood vessels, connective tissue, nerves, etc.
Subcapsular sinus
Space underneath a lymph node capsule
Submucosa
Tissue layer underneath the mucosa
Subneural clefts
Folds or gutters in the sarcolemma
Substantia propria
Layers of collagen which form the cornea
Sudoriferous glands
Sweat gland
Sustentacular cell
Supporting cell
Synapse
Cell junction between neurons
Syncytium
Mass formed by cells which have merged with each other
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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