Shared Flashcard Set

Details

Histology
Epithelium and Skin
18
Veterinary Medicine
Graduate
09/05/2011

Additional Veterinary Medicine Flashcards

 


 

Cards

Term
simple squamous epithelium
Definition

single layer of flattened cells

 

location: mesothelium, endothelium, alveoli, bowman's capsule, loop of henle

 

function: exchange; sites of fluid, metabolite or gas exchange

Term
simple cuboidal epithelium
Definition

single layer of cuboidal cells

locations:

ducts of certain glands

lining some kidney tubules

 

functions:

conduit in ducts of glands

secretion in thyroid gland

absorption in kidney tubules

Term
simple columnar apithelium
Definition

single layer of columnar cells

 

location:

certain glands

digestive tract

 

functions:

a conduit in the ducts of certain glands

secretes mucus in cervix

absorptive and secretory in lining of intestine

(intestinal enterocytes absorb nutirents and goblet cells secrete mucus)

Term
stratified squamous epithelium
Definition

free surface cells are squamous while underlying cells show a variety of shapes

 

two types: 

keratinized: surface cells are dead, lack nuclei and are filled with keratin protein

location: most of exposed surface of body (not cornea or oral cavity)

function: protection against abrasion, dessication, infection and keratin adds waterproof resiliency to epithelium

 

Nonkeratinized: surface cells are viable

location: moist surfaces subject to wear and tear but do not have an absorptive function (mouth, pharynx, esophagus, vagina, urethra)

function: protection

Term
psuedostratified columnar epithelium
Definition

single layer of cells with varying heights and buclei at diff levels

 

location: repiratory tract and reproductive tract

 

Function: lining, secretion, absorption

Term
stratified cuboidal epithelia
Definition

usually only 2 layers

 

location: ducts of some glands

Function: lining

Term
stratified columnar epithelium
Definition

rare form of epithelia

apical cells are columnar but underlying cells tend to be cuboidal

 

location: portions of ducts

 

function: lining

Term
transitional epithelia
Definition

surface cells are domed shaped or flattened depending on the fuctional state

 

location: urinary system, kidney, pelvis, ureter, bladder

 

function: stretches to accomodate urine and prevents water loss to concentrated urine

Term
zonula occludens
Definition

zonula- belt

occludens- closure

 

tight junctions, provides tight seal to prevent leakage in intestines and brain

Term
fascia occludens
Definition
incomplete closures found in capillaries allowing for fluid passage and escape route for leukocytes into tissue
Term
zonula adherens
Definition
intermediate juntions which prevent cell separation
Term
macula adherens
Definition

desmosomes

spot welds found in stratified squamous epithelia to guard agains wear and tear

Term
gap juntions
Definition

communicating junctions

channels bridge the gap between cells allowing for passage of ions and electrical signals from one cell to another

Term
microvilli
Definition

microscopic fingerlike projections of the cells plasma membrane and cytoplasm...supported by a core of fine actin filaments

 

(stereocilia are just very long microvilli located in epididymis)

 

location: striated border of intestines, brush border of kidney and sterocilia of the epididymis

 

function: increase the surface area for secretion and/or absorption

Term
cilia
Definition

motile

membrane coveringa 9+2 arrangement os microtubules

each has a basal body for attachment

flagella are similar to cilia

 

location: trachea and fallopian tubes

Term
epithelial functions
Definition

mechanical protection

protection from dehydration

selective absorption

secretion and lubrication

digestion

transport

exrcetion

sensory reception and transduction

reproduction

Term

types of epithelia

 

Definition

surface epithelia (simple, stratified, psuedostratified // squamous, cuboidal, columnar, transitional)

 

gladular epithelia

 

special epithelia

Term
general features of epithelia
Definition

cover external surface of body, lines all passages that connect with outside (digestion, respiratory, urogenital), lines all coelomis cavities (pleural, pericardial, peritoneal), lines cardiovascular channels (blood vessels and heart endothelium)

 

Supporting users have an ad free experience!