Joints KIN 202-M1

articular system

system of joints between the bones

joint

a union of 2 or more bones, an “articulation”

anatomical joints are described in what 3 ways

1. fibrous don’t move

2. cartilaginous are cartilage

3. synovial move

label the 6 joints

1. sternoclavicular joints

2. manubriosternal joint

3. sternocostal joint

4. costochondral joint

5. xiphisternal joint

6. interchondral joint

label the 4 joints and 2 bones

1. fibrous membrane

2. synovial membrane

3. synovial cavity

4. articular cartilage

5. periosteum

6. articulating bone

What contains synovial fluid

the synovial cavity

synovial fluid function

lubrication, protection, nutrition

viscosity can change

pressure during movement causes fluid to exit and reenter the cavity

joint capsule structure and function

dense connective tissue (collagen)

forms part of the joint boundary

stability, some restriction of movement

articular cartilage structure and function

collagen fibers in a liquid matrix of 80% water

forms smooth bearing, cushions forces

synovial membrane structure and function

forms inner layer of joint capsule

produces fluid within joint

removes cell debris resulting from wear and tear

ligaments structure and function

mostly collagen

provide stability, resists forces that separates bones

primary joint stabilizer

____ acts like air filled tire supported by a light by solid rim (____)

deformable articular cartilage, subchondrial bone

what supports the rim and helps maintain shape while cushioning forces

spokes

synovial fluid lubricates:

friction between articular cartilage, less than between 2 smooth blocks of ice