Agonist Muscles of the Shoulder Girdle PDF

Final PDF to printer TABLE 4.1 Agonist muscles of the shoulder girdle Plane of Muscle Origin Inse...

Final PDF to printer TABLE 4.1 Agonist muscles of the shoulder girdle Plane of Muscle Origin Insertion Action motion Palpation Innervation Abduction Transverse Difficult, but under the pectoralis major muscle and Anterior muscle Downward just inferior to the coracoid Anterior surfaces Coracoid pro- Medial Pectoralis rotation process during resisted of the 3rd to 5th cess of the pectoral nerve minor Frontal depression; enhanced by plac- ribs scapula (C8 and T1) ing the subject’s hand behind Depression the back and having him or her actively lift the hand away Chapter Frontal and lateral side of 4 Abduction Transverse Posterior and lateral muscle the chest below the 5th and 6th ribs just proximal to the Anterior aspect origin during abduction; Surface of the of the whole best accomplished with the Serratus Long thoracic upper 9 ribs at the length of the glenohumeral joint flexed 90 anterior Upward nerve (C5–C7) side of the chest medial border Frontal degrees; in the same position of the scapula rotation palpate the upper fibers between the lateral borders of the pectoralis major and latissimus dorsi in the axilla Elevation Upward Frontal Between occipital Base of skull, Posterior aspect rotation protuberance and C6 and Trapezius occipital of the lateral laterally to acromion, upper protuberance, and Extension of 3rd of the Sagittal particularly during elevation fibers posterior ligaments head at neck clavicle and extension of the head at of neck Rotation of the neck Transverse head at neck Spinal Medial border accessory Elevation Frontal Spinous process of the acromion From C7 to T3 and laterally to nerve and Trapezius of 7th cervical and process and Adduction Transverse acromion process and scapular branches of middle C3 and C4 upper 3 thoracic superior border spine, particularly during fibers Upward Frontal vertebrae of the scapular adduction rotation spine Posterior muscles Triangular space Adduction Transverse From T4 to T12 and medial Spinous process Trapezius at the base of Depression aspect of scapular spine, of 4th to 12th lower fibers the scapular Upward Frontal particularly during depression thoracic vertebrae spine rotation and adduction Adduction Transverse Difficult due to being deep to trapezius, but may be pal- pated through it during adduc- Spinous processes Medial border tion; best accomplished with Dorsal of the 7th cervical of the scapula, Downward Rhomboids subject’s ipsilateral hand behind scapular nerve and first 5 thoracic inferior to the rotation Frontal the back to relax the trapezius (C5) vertebrae scapular spine and bring the rhomboid into action when the subject lifts the Elevation hand away from the back Medial border Difficult to palpate due to Dorsal Transverse pro- of the scapula being deep to trapezius; best scapular Levator cesses of the from the palpated at insertion just Elevation Frontal nerve C5 and scapulae upper 4 cervical superior angle medial to the superior angle branches of vertebrae to the scapular of scapula, particularly during C3 and C4 spine slight elevation Note: The subclavius is not listed because it is not a prime mover in shoulder girdle movements. 96 www.mhhe.com/f loyd19e flo69292_ch04_089-110.indd 96 2/27/14 5:37 PM