Sesh 6: Epithelial Tissues, Exocrine Glands And Dermatology Flashcards
(43 cards)
What are mucous membranes?
They line internal tubes that are open to the exterior & contain mucous-secreting cells.
What are the 3 layers of a mucosal membrane?
- Epithelium-lines lumen
- Lamina propria- connective tissue layer
- Muscularis mucosa- in alimentary tract
What are serous membranes?
Thin, 2 part-membranes lining closed body cavities.
What are the 2 layers that make up serous membranes?
- Mesothelium- simple squamous epithelium
2. This connective tissue layer containing blood vessels and nerves
The outer serosal layer surrounding a serous cavity is the ________ serosa, and the inner is the ________ serosa.
- Parietal
2. Visceral
What is the definition of epithelia?
Sheets of contiguous cells of varied embryonic origin that cover the external body surface, and line internal surfaces.
Do epithelia have a blood supply?
No, they are avascular.
Give examples of where simple squamous epithelium is found.
- alveoli
- mesothelium
- lining of vasculature
- parietal layer of Bowman’s capsule
Where is simple cuboidal epithelium found?
- thryoid follicles
- kidney tubule
- ovary surface
- small ducts of many exocrine glands
Where is simple columnar epithelium found?
- stomach lining and gastric glands
- small intestine and colon-villi and microvilli
- crypts of Lieberkuhn
- fallopian tubes-ciliated
What is simple pseudostratified epithelium?
Looks like more that 1 cell layer, but every cell contacts the basement membrane, even if some do not reach the surface.
Where is non-keratinised, stratified squamous epithelium found?
- Oral cavity
- Oesophagus
- Vagina
What are the main functions of non-keratinised, stratified squamous epithelium?
- Protects against abrasion
- Reduces water loss whilst providing moist surface
Give an example of where keratinised, stratified squamous epithelium is found.
Epidermis of the skin.
What are the 4 layers of the epidermis of the skin (from apical to basolateral)?
- Horny layer- stratum corneum
- Granular layer
- Prickle cell layer
- Basal layer- stratum basale
In what layer of the epidermis are melanocytes found?
Basal layer
In what epidermis layer does terminal differentiation begin?
Prickle cell layer
What is the stratum corneum of the epidermis composed of?
- Flattened corneocytes.
- Almost pure keratin
What layer of epidermis contains Langerhans cells?
Prickle cell layer
Where can transitional, stratified epithelium be found?
- Bladder
- Ureters (urothelium)
- Renal calyces
Name 2 main functions of transitional, stratified epithelium.
- Distensibility
2. Protects underlying tissue from toxic chemicals
Why do some people have darker/more tanned skin than others?
Their melanocytes produce melanosomes, containing the pigment melanin, which last for longer.
*Don’t have more melanocytes.
What are glands?
Invaginations of epithelium specialised for secretion.
What is the name given to the method of secretion of most glands?
Merocrine (exocytosis).
