The Muscular System - Muscles Acting on the Shoulder and Upper Limb

Flashcards created from lecture notes on the muscular system, focusing on muscles acting on the shoulder, upper limb, elbow, forearm, wrist, and hand.

Spaces where muscles are separated by fibrous connective tissue sheets (fasciae) are called __.

Compartments

__ (thick fascia) separates compartments.

Intermuscular septa

Muscles that attach on the axial skeleton and also on clavicle or scapula act on the __.

Shoulder

The __ braces the shoulder and moderates movements.

Clavicle

The __ draws scapula forward and is the prime mover for reaching and pushing.

Serratus anterior

The __ stabilizes scapula and shoulder, and elevates and depresses shoulder apex.

Trapezius

The __ elevates scapula and flexes neck laterally.

Levator scapulae

and retract scapula and braces shoulder.

Rhomboid minor, Rhomboid major

__ flexes, adducts, and medially rotates humerus.

Pectoralis major

__ adducts and medially rotates humerus.

Latissimus dorsi

__ rotates and abducts arm and is an Intramuscular injection site.

Deltoid

__ allows for extension and medial rotation of humerus.

Teres major

__ flexes and medially rotates arm.

Coracobrachialis

The tendons of the four scapular muscles that form the rotator cuff include Supraspinatus, Infraspinatus, Teres minor, and __ muscles.

Subscapularis

__ tendon is easily damaged among the rotator cuff muscles.

Supraspinatus

The four motions of the muscles that act on the elbow and forearm include Flexion, Extension, Pronation, and __.

Supination

__ produces 50% more power than biceps brachii.

Brachialis

__ is the prime mover of elbow extension.

Triceps brachii

__ is a synergistic elbow flexor.

Brachioradialis

__ is the prime mover in forearm pronation.

Pronator quadratus

__ supinates the forearm.

Supinator

__ muscle actions include flexion and extension of wrist and digits, radial and ulnar flexion, finger abduction and adduction and thumb opposition.

Extrinsic

__ means “short”.

Brevis

__ indicates “on ulna side of forearm”.

Ulnaris

__ is a bracelet-like fibrous sheet, passed under by flexor tendons crossing the wrist.

Flexor retinaculum

__ is the tight space between the flexor retinaculum and the carpal bones.

Carpal tunnel

The fleshy mass at the base of the thumb is called the __ group.

Thenar

The fleshy base of the little finger is called the __ group.

Hypothenar