anatomy ch 9

anatomy ch 9 - CHAPTER NINE- ARTICULATIONS INTRODUCTION...

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CHAPTER NINE- ARTICULATIONS INTRODUCTION -articulation: place of contact between bones, bones and cartilage, and bones and teeth -study of articulation is arthrology -As you decrease mobility you increase stability Gelnohumeral (shoulder) Coxal (hip) Elbow Intervertebral joints Suture Less Stable Most Stable Classification of Joints -classified by the tissue that binds them and the movement they permit Tissue Movement Permits Fibrous- conncted by dense regular (fibrous) connective tissue Synarthosis- immovable joint Cartilaginous- held together by cartilage Amphiarthrosis- slightly moveable joint Synovial Joint- fluid filled synovial cavity that separates the articulating surface of the bones;enclosed by a capsule, joined by ligaments Diarthrosis- freely moveable 1. Based on Tissue a. Fibrous- joined by regular dense connective tissue i. Most immovable or slightly moveable ii. No joint cavity iii. GOMPHOSES- only one in humans are at the root of teeth with the sockets of the mandible and maxillae 1. held in by fibrous periodontal ligaments 2. synarthrosis iv. SUTURE- immovable fibrous joints 1. irregular edges decrease fractures and increase strength 2. sutures let the brain continue to grow 3. when there is complete fusion of bone across the suture line, these obliterated sutures are called synotoses v. SYNDESMOSES 1. bones are joined by long strands of dense regular connective tissue ONLY 2. amphiarthrosis
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3. radius and ulna, tibia and fibula – interosseous membrane (provides a pivot point where the two bones can rotate against each other) b. Cartilaginous Joint i. Lack a joint cavity ii. SYNCHONDROSIS 1. joined by hyaline cartilage 2. synarthroses 3. epiphyseal plates in kids—then disappears 4. sternocostal joint 5. costochondral joints- joint b/w rib and costal cartilage *** different from artc. b/w ribs 2-7 (synovial)*** iii. SYMPHYSES 1. pad of fibrocartilage between articulating bones a. resist compression and tension—shock absorber 2. amphyairthroses 3. pubic symphysis- bw/ right and left pubic bones; changes during birth so baby can get through 4. intervertebral joints- allow slight movement b/w
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anatomy ch 9 - CHAPTER NINE- ARTICULATIONS INTRODUCTION...

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