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joints/articulations
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39 Terms
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1
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joint
place where two bones come together
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structural classification
based on what structure holds 2 bones together
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structural classifications of joints (3)
* fibrous joints
* cartilaginous joints
* synovial joints
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fibrous joints
bones are joined by fibrous cartilage
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cartilaginous joints
bones are joined by cartilage
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synovial joints
bones are joined by an articular capsule which creates a joint cavity containing synovial fluid
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functional classification
based on how much movement occurs at that joint
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functional classifications of joints (3)
* synarthrotic joints
* amphiarthrotic joints
* diarthrotic joints
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synarthrotic joints
no movement
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amphiarthrotic joints
some movement
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diarthrotic joints
freely movable
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articular cartilage
found in all synovial joints; absorbs compression so the bone won’t be crushed
* hyaline cartilage covers the opposing bone surfaces
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joint/articular capsule
found in all synovial joints; surrounds the joint cavity and has two layers:
* an outer fibrous capsule continuous with the periosteum
* an inner synovial membrane
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joint cavity
found in all synovial joints; cavity that contains synovial fluid
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synovial fluid
found in all synovial joints; slippery fluid that occupies all free space within the joint capsule
* reduces friction between the cartilages
* distributes nutrients
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reinforcing ligaments
found in some synovial joints; reinforce the joint
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bursae
found in some synovial joints; small, fluid-filled pockets that contain synovial fluid to reduce friction and absorb shock
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suture
joint between skull bones
* structural classification: fibrous
* functional classification: synarthrotic
* example: sutures
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syndesmosis
ligament connects two bones
* structural classification: fibrous
* functional classification: amphiarthrotic
* example: ligaments connecting bone
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gomphosis
a peg-in socket joint
* structural classification: fibrous
* functional classification: synathrotic
* example: teeth joints
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synostosis
formed when two bones completely fuse together
* structural classification: none
* functional classification: synarthrotic
* example: fusion of ilium, ischium, and pubis
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synchondrosis
hyaline cartilage joins two bones
* structural classification: cartilaginous
* functional classification: synarthrotic
* example: true rib joint
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symphysis
fibrocartilage joins two bones
* structural classification: cartilaginous
* functional classification: amphiarthrotic
* example: pubic symphysis joint
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synovial joints
joint capsule joins two bones
* structural classification: synovial
* functional classification: diarthrotic
* example:
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ball and socket joints
mostly freely movable of the synovial joints
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pivot joints
allows for rotational movement
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hinge joints
allows for flexion/extension movement
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gliding joints
allows for only slight sliding movements
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ellipsoidal joint
allow for flexion/extension and circumduction but not rotation
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saddle joint
allow for flexion/extension and circumduction but not rotation
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shoulder joint
* structural type: synovial; ball and socket
* functional type: diarthrotic
* movements: lots of movement
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elbow joint
* structural type: synovial; hinge
* functional type: diarthrotic
* movements: flexion/extension
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atlanto-axial joint
* structural type: synovial; pivot
* functional type: diarthrotic
* movements: rotation
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proximal & distal radio-ulnar
* structural type: synovial; pivot
* functional type: diarthrotic
* movements: rotation
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carpometacarpal of thumb joint (thumb joint)
* structural type: synovial; saddle
* functional type: diarthrotic
* movements: flexion/extension and circumduction
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metacarpophalangeal joint (knuckle joint)
* structural type: synovial; saddle
* functional type: diarthrotic
* movements: flexion/extension and circumduction
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hip joint
* structural type: synovial; ball and socket
* functional type: diarthrotic
* movements: lots of movement
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knee joint
* structural type: synovial; hinge
* functional type: diarthrotic
* movements: flexion/extension
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intercarpal & intertarsal joints
* structural type: synovial; gliding/plane
* functional type: diarthrotic
* movements: gliding movements
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