Epithelia 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 EpitheliaFunctions(LGBaT)
- Lubrication (pericardium, pleua, peritoneum/viscera)
- Gas exchange (alveoli)
- Barrier (bowmans capsule)
- Active transport via pinocytosis (meso/endothelium)
Simple Cuboidal EpitheliaLocations (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 EpitheliaLocations (seven)
- Stomach lining & gastric pits
- Small intestine & colon
- Gall bladder
- Large ducts of some exocrine glands
- Uterus
- Oviducts
- Ductuli efferents of testis
Simple Columnar EpitheliaFunctions (four)LAST
- Lubrication (small intestine & colon)
- Absorption (small intestine, colon & gall bladder)
- Secretion (stomach lining & gastric pits, small intestine & colon)
- Transport (oviduct)
(simple) Pseudostratified EpitheliaLocations (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 EpitheliaFunctions (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 EpitheliaLocations (seven)
- Oral cavity
- Oesophagus
- Larynx
- Vagina
- Part of anal canal
- Surface of cornea
- inner surface of eyelid
Stratified Squamous Non-Keratinised EpitheliaFunctions (two)
- Protections against abrasion
- Reduces water loss whilst remaining moist
Stratified Squamous Keratinised EpitheliaLocations (two)
- Surface of skin
- Limited distribution in oral cavity
Stratified Squamous Keratinised EpitheliaFunctions (four)
- Protection against abrasion
- Prevents water loss
- Prevents ingress of microbes
- Shields against UV light damage
Stratified Transitional (urinary) EpitheliaLocations (four)
- Renal calyces
- Ureters
- Bladder
- Urethera
Stratified Transitional (urinary) EpitheliaFunctions (two)
- distensibility
- protection of underlying tissue from toxic chemicals
Basement membranePosition + Description
Thin, flexible, acellular layer which lies between epithelial cells and subtending connecting tissue
Basement membraneStructure
- Basal lamia, laid down by epithelial cells
- Thickness increased by a variably thick layer of reticular fibrils (type 3 collagen), elaborated by subtending connective tissue
Basement MembraneFunction (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