BIOL 115 Lecture Notes - Lecture 7: Sternocostal Joints, Costal Cartilage, Synchondrosis

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11 Dec 2020
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Manubriosternal joint (angle of st louis)- fusion of manubrium with body of sternum (amphiarthrosis, synarthrosis and synchondrosis) Xiphisternal joint- junction of inferior sternal body with xiphoid process (synchondrosis) Sternocostal joints- lateral sternum connected to anterior cartilaginous end of 1-7 ribs. Intervening disc separates into 2 distinct junctions. Costochondral junction- 1st-10 ribs anterolaterally articular with costal cartilages, represents transition between bone and cartilage of anterior ends of each rib (allows very little movement) chondrosternal junction- medial end rib cartilage cartilages of ribs 1- 7 articulate with concave costal facets sternum, 1st synarthrosis (very limited movement) 2-7 synovial (permits slight gliding movements) Interchondral joint- opposing borders of rib cartilage 7-10 from joints articulate with cartilage immediately above. Ribs 11 and 12 do not attach directly to sternum. Rotation 60 total (30 each side, amount decreases from cranial to caudal) Sb 50 total (25 each side, amount constant throughout t-spine) Flx- inferior facet of superior vertebra glides anterosuperior on superior facet of.

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