TOB L1.2 EPITHELIAL TISSUES Flashcards
Simple Squamous Epithelia
Locations (6 points)
- Lining of blood vessels “endothelium”
- Lining of body cavities - pericardium, pleura, pertoneum ‘mesothelium’
- Respiratory epithelium (pulmonary alveoli)
- Bowman’s capsule (kidney)
- Loop of Henle (kidney)
- Inner and middle ear
Simple Squamous Epithelia
Functions
(LGBaT)
- Lubrication (pericardium, pleua, peritoneum/viscera)
- Gas exchange (alveoli)
- Barrier (bowmans capsule)
- Active transport via pinocytosis (meso/endothelium)
Simple Cuboidal Epithelia
Locations (four)
- Thyroid follicles
- Small ducts of many exocrine glands
- Kidney tubules
- Surface of the ovary (germial epithelium
Simple Cuboidal Epithelia - It’s glandular!
Functions (four)
Baah(riatric)
- Barrier/covering (ovary)
- Absorption & Conduit (exocrine glands)
- Absorption & Secretion (kidney tubules)
- Hormone synthesis, storage and metabolism (thyroid)
Simple Columnar Epithelia
Locations (seven)
- Stomach lining & gastric pits
- Small intestine &olon
- Gall bladder
- Large ducts of some exocrine glands
- Uterus
- Oviducts
- Ductuli efferents of testis
Simple Columnar Epithelia
Functions (four)
LAST
- Lubrication (small intestine & colon)
- Absorption (small intestine, colon & gall bladder)
- Secretion (stomach lining & gastric pits, small intestine & colon)
- Transport (oviduct)
(simple) Pseudostratified Epithelia
Locations (five)
- Lining of nasal cavity, trachea and bronchi
- Epididymis and ductus deferens
- Auditory tube and part of typanic cavity
- Lacrimal sac
- Large excretory ducts
(simple) Pseudostratified Epithelia
Functions (four)
MAPS
- Mucus secretion (Nasal Cavity, trachea and bronchi (URT) )
- Absorption (Epdidiymis)
- Particle trapping and removal (URT)
- Secretion and conduit (URT, ductus deferens)
Stratified Squamous Non-Keratinised Epithelia
Locations (seven)
- Oral cavity
- Oesophagus
- Larynx
- Vagina
- Part of anal canal
- Surface of cornea
- inner surface of eyelid
Stratified Squamous Non-Keratinised Epithelia
Functions (two)
- Protections against abrasion
- Reduces water loss whilst remaining moist
Stratified Squamous Keratinised Epithelia
Locations (two)
- Surface of skin
- Limited distribution in oral cavity
Stratified Squamous Keratinised Epithelia
Functions (four)
- Protection against abrasion
- Prevents water loss
- Prevents ingress of microbes
- Shields against UV light damage
Stratified Transitional (urinary) Epithelia Locations (four)
- Renal calyces
- Ureters
- Bladder
- Urethera
Stratified Transitional (urinary) Epithelia Functions (two)
- distensibility
- protection of underlying tissue from toxic chemicals
Basement membrane
Position + Description
Thin, flexible, acellular layer which lies between epithelial cells and subtending connecting tissue
Basement membrane
Structure
- Basal lamia, laid down by epithelial cells
- Thickness increased by a variably thick layer of reticular fibrils (type 3 collagen), elaborated by subtrending connective tissue
Basement Membrane
Function (three)
- Strong, flexible layer to which epithelial cells adhere
- Serves as cellular and molecular filter
- Degree to which malignant cells penetrate basmenent membrane highly relevant to prognosis