body membrane- histology

body membranes

Structures that cover or line body surfaces; their general function is to protect body surfaces.

external

cutaneous membrane = SKIN

internal

line body cavities/ spaces

3 ET membranes

1. cutaneous

2. mucous

3. serous

CT tissue membrane

synovial membrane

cutaneous membrane

def:he skin, which is the body's external membrane.

loc: covers outside body

function: protection

DRY MEMBRANE

3 cutaneous membranes

1. keratinized stratified squamous ET

2. areolar CT

3. dense irregular CT

keratinized stratified squamous ET

type of membrane: cutaneous

location: epidermis

areolar CT

type of membrane: cutaneous

location: dermis

dense irregular CT

type of membrane: cutaneous

location: dermis

mucous membrane

line surfaces OPEN to outside/exterior of body

5 mucous membrane ET types

1. non-keratinized stratified squamous ET (lining of mouth)

2. simple columnar ET (lining of stomach)

3. simple squamous ET (alveoli in the lungs)

4. PSCC ET (lining of trachea)

5. transitional ET (urinary bladder)

**LOOSE CT deep to ET = areolar CT

serous membrane

lines cavities NOT open to outside of body

superficial serous membrane

superficial= external/toward the surface

simple squamous ET

deep serous membrane

deep=internal/below the surface

areolar CT

serous membrane function

secretion of serous fluid to reduce friction btw surfaces

serous membranes are in..

PAIRS, separated by thin cavity w serous fluid

visceral serosa

lies on surface of organs

parietal serosa

lines wall of body cavity of surrounding organ w fluid sac

5 specific serous membranes

1. peritoneum: lining abdominopelvic (peritoneal) cavity

2. pleura: lining pleural cavities around lungs

3. pericardium: lining pericardial cavity around heart

4. visceral pericardium: ON surface of heart

5. parietal pericardium: SURROUNDS heart and forms sac

synovial membrane

membrane that lines synovial, fluid-filled joints.

synovial membrane location

lining fluid filled JOINTS

-knee

-elbow

synovial mem tissue

areolar CT

synovial mem function

secretion of synovial fluid

-into joint cavities around synovial joints

-lubricate/cushion synovial joints