Body Systems Flashcards
Skeleton consists of
Cartilage and bone. Axial and appendicular skeleton
Axial skeleton
Consists of the bones of the skull and vertebral column, ribs and sternum
Appendicular skeleton
Consists of the bones of the upper and lower limbs
Cartilage definition
And avascular form of connective tissue consisting of extra cellular fibres embedded in a matrix that contain cells, localised and small cavities
In weight bearing areas/areas prone to pulling forces
Amount of collagen is greatly increased, cartilage is almost inextensible
When weight bearing/stress demands are less
Cartilage contains more elastic fibres and fewer collagen fibres
Cartilage function
-support soft tissues
- provide a smooth gliding surface for bone articulations at joints
-enable the development and growth of long bones
3 types of cartilage
Hyaline (most common), elastic and fibrocartilage
Hyaline
Matrix contains a moderate amount of collagen fibers
Elastic cartilage
Matrix contains collagen fibres alongside a large number of elastic fibres
Fibrocartilage
Matrix contains a limited number of cells and ground substance amidst a substantial amount of collagen fibres
Bone definition
A calcified, living, connective tissue that forms majority of the skeleton. Consists of an intercellular calcified matrix, containing collagen fibres and several types of cells
Bone functions
- supportive structures for the body
- protector of vital organs
- reservoirs of calcium and phosphorus
- levers on which muscles act to move
- containers for blood producing cells
Two types of bone
-compact (trabecular)
-spongy (cancellous)
Compact bone
Dense bone that forms the outershell of all bones and surrounds spongy bone
Spongy bone
Consists of spicules of bone enclosing cavities, containing blood-forming cells.
Long bones
Tubular
Short bones
Cuboidal
Flat bones
Consists of two compact bone plates, seperated by spongy bone (skull)
Irregular bones
Bones with various shapes
Round or oval bones
Sesamoid bones (develop in tendons)
Bones are
Vascular and innervated
Joint definition
The sites where two skeletal elements come together