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Lecture #8 - Muscles of the Upper Limb.doc

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Queen's University
Anatomy and Cell Biology
ANAT 101
Richard Oko

Lecture # 8 - Muscles of the Upper Limb Muscles of the Upper Limb A) Shoulder Girdle B) Arm -Anterior and Posterior C) Forearm - Anterior and Posterior D) Hand SHOULDER GIRDLE MUSCLES • can be classified into groups A) attaching axial skeleton to scapula and clavicle (girdle) B) attaching axial skeleton to humerus C) attaching girdle to humerus A) Muscles attaching axial skeleton to scapula -act by moving scapula up, down, in, and out serratus anterior: runs back from rib cage and inserts deep in the medial border of the scapula trapezius: large triangular muscle, originates from cervical and thoracic vertebrae -inserts mostly on spine of scapula lavator scapulae and rhomboids: deep to trapezius, run from cervical and upper thoracic vertebrae down to medial border of scapula B) Muscles attaching axial skeleton to humerus latissimus dorsi: on the back, originates from lumbar vertebrae -inserts on humerus next to bicipital groove Lecture # 8 - Muscles of the Upper Limb -extensor and adductor pectoralis major: on the front, originates on clavicle and sternum (and costal cartilages) -inserts in front of latissimus dorsi by the bicipital groove -adducts, flexes, and medially rotates C) Muscles attaching girdle to humerus deltoid: makes roundness of shoulder -originates from clavicle, acromion, and spine of scapula -inserts 1/2 way down humerus -abductor terres major: between deltoid and latissimus dorsi -originates at inferior angle of scapula -inserts on edge of bicipital groove -adductor rotator cuff muscles (4) -originate on scapula -hold head of humerus into glenoid fossa -move humerus in various directions -infraspinatus -supraspinatus -subscapularis -terres minor ARM MUSCLES • originate mostly on humerus, insert on radius and ulna • Anterior group -> flexion of elbow joint (innervated by musculocutaneous nerve) coracobrachialis: originates on coracoid process, inserts on arm biceps brachii: originates on coracoid (short head)
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