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Transcript

Joints = Articulations

  • Where 2 bones come together
  • Functions of joints
  • Allow for mobility
  • Ways joints are classified
  • Functionally
  • Structurally

Structural Classification of Joints

Special Movements - at specific joints:

Functional Classification of Joints

  • Fibrous joints
  • Generally immovable = Synarthroses
  • Cartilaginous joints
  • Immovable = Synarthroses
  • Slightly movable = Amphiarthrosis
  • Synovial joints
  • Freely movable = Diarthroses
  • Synarthroses – immovable joints
  • Ex. Skull sutures, teeth
  • Amphiarthroses – slightly moveable joints
  • Ex. Between vertebrae, at disc
  • Diarthroses – freely moveable joints
  • Ex. knee, elbow, wrist

  • Elevation/depression: Pectoral Girdle
  • Eversion/inversion: Ankle/ Tarsals
  • Dorsiflexion/plantar flexion: Metatarsals
  • Opposition of thumb: Mecarpals
  • Supination/pronation: Ankle/ Tarsals
  • Protraction/retraction: Pectoral Girdle

Synovial Joints

Types of Movement

Structures Associated with Synovial Joints

  • Articulating bones are separated by a joint cavity
  • Synovial fluid is found in the joint cavity
  • Features Associated with Synovial Joints
  • Articular cartilage (hyaline cartilage) covers the ends of bones
  • Joint surfaces are enclosed by a fibrous articular capsule
  • Have a joint cavity filled with synovial fluid
  • Ligaments reinforce the joint

Fibrous and Cartilaginous Joints

  • Bursae – flattened fibrous sacs
  • Lined with synovial membranes
  • Filled with synovial fluid
  • Not actually part of the joint
  • Tendon sheath
  • Elongated bursa that wraps around a tendon
  • Flexion: bending
  • Extension: straightening
  • Abduction: movement away from midline
  • Adduction: movement toward the midline
  • Pronation: rotation of the forearm with palms down
  • Supination: rotation of the forearm with palms up (anatomical position)
  • Rotation: movement of a structure about the long axis
  • Fibrous Joints
  • Bones united by fibrous CT
  • Sutures
  • Cartilaginous Joints
  • Bones connected by cartilage
  • Pubic symphysis
  • Intervertebral joint

Types of Joints

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