Epithelial cells and surface speclisations Flashcards
Serous membranes
Sin to put membranes which lines that enclose body cavities and enveloped the viscera
Where do serous membranes line
The Peritoneum-which envelop many abdominal organs
the pleural sacs- which envelop the lungs
the pericardial sac- which envelop the heart
Serous membrane consists of
Simple aquamous epithelium (musothelium)
a thin layer of connective tissue that attaches the epithelia the adjacent tissues
The inner serous membrane wall is called
visceral
The outer serous membrane wall is called
parietal
Classification of epithelial cell types simple
Simple as one cell layer thick squamous cuboidal columnar pseudo stratified
Classification of epithelial cell types stratified
squamous
cuboidal
columnar
transitional
Give one example of where simple cuboidal epithelial cells may be found
Absorption secretion kidney tubules
Define the pseudo stratified epithelia
Of those epithelia in which all cells may contact with the basement membrane but not all the cells which the epithelial cell surface
Stratified squamous epithelia non-keratinised
Vagina
Stratified squamous keratinised epithelium
Epidermis
Keratinocytes
Basal layer
Lose ability to divide
keratinocytes synthesise curtains which contribute to the strength of the epidermis
Keratinocytes transition time
28-40 days
Psoriasis
Transition time of keratinocytes only 2 to 4 days
Melanocytes
Produce melanin the main pigment that gives the skin its colour
produce more melanin but are not increased in number into handle darker skin
