joints Flashcards
Articular fat pads
cushion btwn fibrous layer of capsule (intracapsular) and the synovial membrane (extra-articular)
Articular disks
- fibrocartilage
- stabilize articular surfaces to improve the fit of the bone ends, stablilize joint, reduce wear and tear
tendon sheath
elongated bursa that wraps around tendons
bursa
- outside joint capsule
- flattened fibrous sacs
- synovial membranes and filled with synovial fluid
- act as ball bearingswhere ligaments muscles tendons and bones rub together
3 stabilizing factors of synovial joints
1) shape of articular surface
2) ligamentnumber and location
3) muscle tone (keeps tendons taught across joints
how many types of synovial joints
6 types, based onshape of articular surfaces
synovial joints: plane joint
carpels and metacarpels
flat articular surfaces
gliding non axial movement
synovial joints: hinge joints
cylinder and trough
humerous and ulna
flexion and extension uni-axial movement
synovial joints: pivot joint
sleeve and axle
radius and ulna
uniaxial movement: rotation
synovial joints: condylar joint
one concave one convex (oval shaped)
btwn metatarsals and phalanges
biaxial movement: (flexion and extension) (abduction and adduction)
synovial joints: saddle joints
concave and convex (saddle shaped)
btwn tapezium and metacarpal
biaxial movement: (flexion and extension) (abduction and adduction)
synovial joints: Ball and socket joints
- cup and spherical head
- shoulder and hip joints
- multiaxial movement: (flexion and extension) (abduction and adduction) (rotation)
TMJ (temporalmandibular joint)
- temporal fossa
- articular tubercle
- mandibular condyle
- articular capsule thickens into strong lateral ligaments
- most easily dislocated joint in body
how fix TMJ dislocation
roll syringe back
reem it
Hip (coxal) joint
- ball and socket
- acetabular labrum - enhances depth of socket
- head of femur articulates with acetabulum
- good range of mvmnt but limited by depth of pocket (but makes much harder to dislocate = stable)