HN210 Lecture Notes - Lecture 6: Rotator Cuff, Axillary Nerve, Pectoralis Major Muscle
Document Summary
Find spine of scapula the supraspinatus is sitting above it. O: dorsal surface of scapula above spine, superior to spine of scapula. A: abducts humerus (assists deltoid) for first 15 degrees after that the deltoid takes over. O: infraspinatus fossa (dorsal surface below spine of scapula) N: suprascapular nerve have common insertion to supraspinatus. A: lateral rotation of humerus; keeps head of humerus in place works in opposition to subscapularis and pectoralis major. O: upper 2/3 of dorsal surface of lateral border of scapula. N: axillary nerve (terminal branches of brachial plexus) A:laterally rotates humerus, keeps head of humerus in place. Play role is helping bigger muscles do actions. Has fibres that run along the sagittal plane all 3 sections perform different actions. O: (anterior ) lateral 1/3 of clavicle; (posterior) spine of scapula; (lateral) acromion shares insertion point/ attachment with trapezius. I: 3 heads converge onto deltoid tuberocity indent on the bone.
