joints Flashcards
joint classification
- function –> range of motion
- structure –> what is the joint made up of
range of motion classification
- synarthrosis
- amphiarthrosis
- diarthrosis
synarthrosis
an immovable joint
ex… sutures of the cranial bones
amphiarthrosis
a slightly moveable joint
ex… the vertebrae
diarthrosis
a freely moveable joint
ex… shoulder joint, hip joints
synarthrosis subcategories
- sutures
- gomphosis
- synchondrosis
- synostosis
sutures
joints made by interlocking bones
ex… sutures of the cranium
gomphosis
periodontal ligaments of the teeth and jaw bones
synchondrosis
joint within the epiphysis of the long bones
ex… epiphyseal plate
synostosis
joint between two fused bones
ex… the fusion of the three coxal bones of the pelvic girdle
-ilium
-pubis
-ischium
amphiarthrosis subcategories
- syndesmosis
- symphysis
syndesmosis
ligaments connecting two bones BUT also limit their motion
ex… the distal joint of the radius and ulna
ex… the joint between the tibia and fibula
ex… intervertebral discs
symphysis
bones separated by a wedge/pad of cartilage
ex… between the pubic bones
distal radius and ulna restriction
unlike the proximal joint of the radius and ulna the distal joint can’t protonate/supinate
the proximal joint is diarthrosis
diarthrosis subcategories
- synovial joints
synovial joints
found at the ends of a long bone
ex… shoulder joint
ex… hip joint
ex…knee joint
ex… elbow joint
monoaxial, biaxial, triaxial
mono –> 1x axis
bi –> 2x axis
tri –> 3x axis
joint cheat sheet
synovial joints breakdown
six characteristics…
1. joint capsule
2. articular cartilages
3. joint cavity w/ synovial fluid
4. synovial membrane
5. accessory structures (bursae ligaments, tendons)
6. sensory nerves and blood vessels
synoviocytes
cells of the synovial joint. present in the synovial fluid
bursae
the bursae is a sac like part of the synovial joint that lubricates the joint
it acts as a cushion and gliding surface to reduce friction between tissues
the bursae be inflamed resulting in bursitis
the histological structure of joints
- bony fusion
- fibrous joint
- cartilaginous joint
- synovial joint
bony fusion
frontal bone fusion
fibrous joint
the sutures of the skull
cartilaginous joint
ex… pubic symphysis
synovial joint
ball and socket / hinge joints
ex… knee and elbow joints
ex… joints of the fingers
interpharangeal joint
synovial joint between the phalanges of the fingers