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BI13_Ch8 PP Slides - Joints Chapter 8 Goals Be able to...

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Joints Chapter 8
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Goals Be able to classify joints based on function and structure Describe and give examples of fibrous, cartilaginous, and synovial joints Know the different classification of joint movement Be able to describe the 6 classes of synovial joints Joint injuries and diseases
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Classification of Joints Definition and Function of Joints Functional Classifications Structural Classifications
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Articulations Joint = Articulation Place where two bones meet Function of joints 1. Give skeleton mobility 2. Hold skeleton together Articulations are the weakest parts of the skeleton Still can resist many forces
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Classification of Joints Definition and Function of Joints Functional Classifications Structural Classifications
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Functional Classifications Classify based on how much movement – Synarthroses • Immovable Typically on axial skeleton – Amphiarthroses Slightly moveable Typically on axial skeleton – Diarthroses Freely movable Typically on limbs
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Classification of Joints Definition and Function of Joints Functional Classifications Structural Classifications
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Structural Classifications Classify based on material binding bones together – Fibrous Bones joined by collagen fibers – Cartilaginous Bones joined by cartilage – Synovial Joint lined with synovial membrane We will examine by structural classification
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Three Basic Joints Fibrous Joints Cartilaginous Joints Synovial Joints
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Characteristics of Fibrous Joints Bones are joined by fibrous tissue No joint cavity present Most are synarthroses – Immovable A few are amphiarthroses Slight movement
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Sutures Only occur between bones of skull Space between bones filled with short connective tissue fibers • Syntoses Fibrous tissue ossifies Occurs in middle age Protects the brain
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Syndesmosomes Bones are connected by a ligament Cord of fibrous tissue connecting bones Vary in length Longer fibers allow more movement Still classified as synarthroses Examples: Distal tibiofibular joint Interosseous membrane connecting radius and ulna
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Gomphoses “Peg in socket” fibrous joint Only example in humans is a tooth in alveolar socket Periodontal ligament
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Three Basic Joints Fibrous Joints Cartilaginous Joints Synovial Joints
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Characteristics of Cartilaginous Joints Bones are joined by cartilage No joint cavity present Two types of cartilaginous joints – Synchondroses – Symphyses
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Synchondroses Bones are connected by a bar or plate of hyaline cartilage Virtually all are synchondroses • Examples Epiphyseal plate in growing long bones – 1 st sternocostal joint
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Symphyses
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