NUR 0012 Lecture 22 Ch. 10 Muscular System Cont.: Shoulder, Arm, and Forearm MusclesOutline of Last LectureI. Ch. 10 cont.A. Deeper and stronger anterior neck musclesB. Head and neck: superficial posteriorC. Deeper and stronger posterior neck musclesD. Erector spinae groupE. Abdominals F. Diaphragm G. Main movements of the scapulaOutline of Current LectureI. Ch. 10 muscular system cont.A. Shoulder muscles: axial, scapular, and rotator cuffsB. Arm muscles: anterior and posteriorC. Forearm muscles: flexors, extensors, pronators, supinator, and thumb movementsCurrent LectureI. Ch. 10 muscular system cont.A. Shoulder muscles: attach from either the trunk or scapula to humeral shaf1. Axiala. Pectoralis major: adduction and medial rotation of humerusb. Latissimus dorsi: extension, adduction, and medial rotation of humerusThese notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.2. Scapulara. Deltoid: largest most functional shoulder muscle1) Anterior flexion, posterior extension, and abductionb. Teres major: extension, medial rotation, adduction of humerus3. Rotator cuff: SITS, all 4 attach to tubercles of humerus, they stabilize the shoulderand rotate the humerusa. Supraspinatus: stabilizes the joint and initiates abductionb. Infraspinatus: lateral rotation and extensionc. Teres minor: lateral rotation and extensiond. Subscapularis: medial rotation of humerusB. Arm muscles1. Anterior: actions mainly flexion of elbow and some shoulder flexiona. Coracobrachialis: flexes and adducts arm at shoulderb. Biceps brachii: flexes elbow, supinates arm, and flexes shoulderc. Brachialis: flexes elbowd. Brachioradialis: flexes forearm, aids in supination when in neutral position2. Posteriora. Triceps brachii: major extensor on posterior side of arm, extends arm and forearmC. Forearm muscles: actions at wrist and digits1. Most forearm flexors originate from the common flexor tendon (CFT) on the medial epicondyle of humerusa. Flexor carpi radialis: flexes wrist, fixates wrist during digit flexionb. Flexor carpi ulnaris: flexes wrist, fixates wrist during digit flexionc. Flexor digitorum superficialis: flexes wrist, flexes digits 2-5d. Flexor digitorum profundus: flexes wrist, flexes digits 2-52. The pronators and supinator allow for the unique movements of the radioulnar jointa. Pronator teres: pronates handb. Pronator quadratus: prime pronator of forearmc. Supinator: supinates hand3. Most forearm extensors originate from the common extensor tendon (CET) on the lateral epicondyle of the humerusa. Extensor carpi radialis longus: extends wrist, fixes during finger extensionb. Extensor carpi ulnaris: extends wrist, fixes during finger extensionc. Extensor digitorum: extends wrist, extends digits 2-54. Thumb movementsa. Flexor and extensor pollicis musclesb. Abductor and adductor pollicis
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