8 - Membranes

Question 1

Define a membrane

Answer 1

 simplest organs – only 2 tissue types

o consist of epithelium attached to CT (with a basement membrane between them)

Question 2

What are the 4 membrane types

Answer 2

Mucous membrane
Serous membrane
Synovial membrane
Cutaneous membrane

Question 3

Describe the mucous membrane

Answer 3

 line cavities which open directly to the body exterior
 also called the mucosa of the… e.g. digestive, respiratory, urinary, reproductive systems
 2 layers:
a) epithelial layer (avascular) varies from simple squamous to pseudostratified
b) CT (loose areolar – vascular), named the lamina propria, nourishes epithelial cells

Question 4

What is the lamina propria?

Answer 4

The loose areolar CT tissue in the mucous membrane.

Question 5

What is the serous membrane?

Answer 5

 line closed cavities that DO NOT open to the exterior i.e. abdominal and chest cavities
 covers organs in these cavities
 also called serosa in the… (especially the peritoneal cavity)
 serous fluid between layers (slippery)

Question 6

What is the structure of a serous membrane?

Answer 6

composed of epithelial layers (often simple squamous) next to serous cavity, & CTs (areolar) on the outsides

Question 7

What are the two layers of the serous membrane?

Answer 7

a) parietal layer – against cavity wall

b) visceral layer – against organ

Question 8

What are the locational names of serous membranes?

Answer 8

o Pleura – lung
 e.g. parietal & visceral pleura
o Peritoneum – abdominal organs
o Pericardium – heart

Question 9

Describe synovial membranes

Answer 9

 in joints
 areolar CT, no epithelium (only ONE tissue type!)
 Synovial membranes are tissue level, not organ. It’s a lie!

Question 10

Describe cutaneous membranes

Answer 10

 skin
o epithelium = stratified squamous (named the epidermis)
o CT = areolar and dense irregular (named the dermis)