Unit 8: Body cavities, organs and membranes

What are the 2 spaces that house and protect organs

Dorsal Body Cavities

Ventral Body Cavity

What is included in Dorsal Body Cavity

a) cranial cavity

b) vertebral body cavity - spinal cord

What is included in ventral body cavity

a) thoracic (chest)

• Pericardial cavity - heart

• Pleural cavity - lungs

b) abdominal cavity -

c) pelvic cavity - houses urinary and reproductive organs and rectum

how many tissue types do organs consist of?

what about membranes?

organs - all 4

membranes - 1 and 2 - lines inner and outer surfaces of body and organs

Membrane types

Mucous membranes (mucosa)

Serous membranes (serosa)

Synovial membranes

Cutaneous membranes

what do mucous membranes line?

lines cavities of organs that open directly to body exterior

aka mucosa of the urinary reproductive, digestive, and respiratory systems.

2 layers of mucous

epithelial layer - contact with lumens, avascular, many goblet cells.

laminate proparia - made of loose areolar CT, vascular, nourishes epithelial cells. it connects epithelial layer to wall of the organ.

what is serous membranes?

lines body cavities

covers external surfaces of organs in these cavities

double layered - layers composed of simple epithelium bound to areolar tissue

• parietal layer - against cavity wall

• visceral layer - against organ

epithelial layers secrete serous fluid into serous cavit

names of the location for the serous membranes

pericardium - heart

pleura - lung

• ex. parietal and visceral pleura

Peritoneum - abdominal organs

synovial membranes

in joints

areolar connective tissue, no epithelium

only one tissue types therefore not an organ

Cutaneous

skin

epithelium - stratified squamous

dermis - areolar and dense irregular