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Section A: Applied Anatomy and Physiology
2. Joint type
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Syllabus Definitions and examples of fibrous, cartilaginous and synovial joints The typical structure and features of a synovial joint The type of join and the bones which articulate at the following joints: Shoulder, elbow, radio-ulnar, wrist, hip, knee, ankle, spine
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Joint Classification Structural classification is based on anatomical characteristics. Fibrous: no synovial cavity and bones are held together by fibrous connective tissue. Cartilaginous: no synovial cavity and the bones are held together by cartilage. Synovial: bones forming the joint have a synovial cavity. Held together by the articular capsule and often by accessory ligaments.
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Fibrous Joint (Suture)
Fibrous Joint (Suture) * the amount of movement is based on the length of the tissue fibres *
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Fibrous Joint (Syndesmosis)
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Cartilaginous Joint Types
(Synchondroses) – temporary joints present in children E.g. epiphyseal plates in long bones (Sympheses) – permanent cartilaginous joints E.g. vertebral column
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Temporary Joint
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Permanent Joint
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Synovial Joints There are 6 types
These are categorized according to range of movement possible Movement determined by: Shape of articulating surfaces Position of ligaments Number of ligaments
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Synovial Joint Features
Common features include A joint (articular) capsule: unites the articulating bones. A joint cavity. A synovial membrane: secretes synovial fluid to reduce friction/absorb shock, supply nutrients. Articular (hyaline) cartilage.
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Some Synovial Joints Also Have…
Bursae Small sacs of synovial fluid located at points of friction Menisci Discs of cartilage between bone surfaces Pads of fat Added protection
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Synovial Joints
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Synovial Joints
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Ball and Socket
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Ball and Socket Joint Multiaxial Movement in all 3 planes
Flexion/Extension Abduction/Adduction Circumduction Rotation
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Hinge
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Hinge Joint Uniaxial Only permits flexion and extension
Examples are the knee, elbow and ankle
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Pivot
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Pivot Joints Uniaxial It allows rotation only around its own longitudinal axis Example is the atlanto-axial joint
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Plane
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Planar Joints Nonaxial
The motion they allow does not occur around an axis or along a plane Examples are intercarpal joints, intertarsal joints etc
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Saddle
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Saddle Joints Biaxial Flexion/Extension Abduction/Adduction
Circumduction Example is the carpometacarpal joint
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Condyloid
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Condyloid Joints Biaxial Flexion/Extension Abduction/Adduction
Circumduction Examples are the wrist and metacarpophalangeal joints
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