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Histology Glossary

 

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.