BPK 142 Lecture 9: Unit 9 Lab

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Inactive muscles have various states: concentric shortening under load, eccentric lengthening under load. Classification and action of muscles: shoulder girdle, two bones primarily involved the clavicle and the scapula. Insertion: anterior portion of the vertebral birder of the scapula: rhomboid muscle, deep to the trapezius muscle, origin: spinous processes of the last cervical and first five thoracic vertebrae. Insertion: medial border of the scapula, below the spine: action: retraction and downward rotation of the scapula, levator scapulae muscle, origin: transverse processes of the upper four cervical vertebrae, action: elevates the medial margin of the scapula. Insertion: superior angle of the scapula, above the base of the scapular spine. Shoulder joint: formed by the articulation of the humerus with the scapula. Most freely movable joint in body: movements: Inward rotation the turning of the humerus around its long axis so that its anterior aspect moves medially: outward rotation the opposite of inward rotation the anterior aspect of humerus moves laterally.

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