Chapter 23

Chapter 23 - Chapter 23 Articulation and Body Movements 1...

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Chapter 23 Articulation and Body Movements 1
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Functions of articulations l Articulations ¡ Where two bones interconnect l To hold bones together l To allow movements of the body 2
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l Immovable joints- Synarthroses ¡ More predominant in the axial skeleton l Slightly moveable joints- Amphiarthroses ¡ More predominant in the axial skeleton l Freely moveable joints- Diarthroses ¡ More predominant in the appendicular skeleton Functional classification 3
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Structural classification l Fibrous joints l No presence of joint cavity l They are synarthroses or amphiarthroses l Fibrous tissue present ¡ Suture = skull bones bound together by dense connective tissue. It is a synarthrose. Bones interlock ¡ Gomphosis = teeth bound to bony sockets by periodontal ligaments 4
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Structural classification ¡ Synostosis = two bones completely fused. Portions of the skull ¡ Syndesmosis = bones connected by a ligament. Distal articulation between fibula and tibia. Movement varies from immovable to slightly variable. 5
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6 Fibrous Structural Joints: Syndesmoses Figure 8.1b
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Cartilaginous joints l Bones connected by a pad or plate of cartilage ¡ Symphysis = bone separated by fibrocartilage. Pubic symphysis and intervertebral joints. It is amphiarthrotic ¡ Syncondrosis = bones connected by hyaline cartilage. Epiphyseal plate and articulation of the first rib with the sternum. It is synarthrotic 7
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8 Cartilaginous Joints: Synchondroses
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Chapter 23 - Chapter 23 Articulation and Body Movements 1...

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