3 Muscle ID Rotator cuff, arm, elbow, wrist & hand

Muscle flashcards for Anatomy & Physiology practical exam

Supraspinatus

Action: Shoulder abduction; stabilizes the glenohumeral joint

Attachments: Proximally: Supraspinous fossa of scapula; Distally: Greater tubercle of humerus

Infraspinatus

Action: Shoulder external (lateral) rotation; stabilizes the glenohumeral joint

Attachments: Proximally: Infraspinous fossa of the scapula; Distally: Greater tubercle of humerus

Teres minor

Action: Shoulder external (lateral) rotation; stabilizes the glenohumeral joint

Attachments: Proximally: Lateral border of scapula; Distally: Greater tubercle of humerus

Innervation: Axillary nerve

Subscapularis

Action: Shoulder internal (medial) rotation; stabilizes the glenohumeral joint

Attachments: Proximally: Subscapular fossa of scapula; Distally: Lesser tubercle of humerus

Deltoid

Action: Anterior fibers: flex and internally (medially rotate humerus); Lateral/middle fibers: abduct humerus; Posterior fibers: extend and externally (laterally) rotate humerus

Attachments: Proximally: Acromion and spine of scapula, clavicle; Distally: Deltoid tuberosity of humerus

Innervation: Axillary nerve

Teres major

Action: Adducts, extends, and medially rotates humerus

Attachments: Proximally: inferior angle of scapula; Distally: medial lip of intertubercular sulcus of humerus

Coracobrachialis

Action: Flexes shoulder

Attachments: Proximally: Coracoid process of scapula; Distally: Humerus

Innervation: Musculocutaneous nerve

Pectoralis major

Action: Internally (medially) rotates and adducts shoulder

Attachments: Distally: Lateral lip of intertubercular sulcus of humerus

Latissimus dorsi

Action: Adducts, extends, and medially rotates humerus

Attachments: Distally: Floor of intertubercular sulcus of humerus

Brachialis

Action: Elbow flexion, stabilizes elbow joint

Attachments: Proximally: humerus; Distally: coronoid process of ulna

Innervation: Musculocutaneous nerve

Biceps brachii

Action: Longhead: elbow flexion, forceful supination, shoulder flexion, and shoulder stability; Short head: elbow flexion and forceful supination

Attachments: Proximally (long head): inferior glenoid cavity; Proximally (lateral head, medial head): humerus; Distally: olecranon process of ulna

Innervation: Musculocutaneous nerve

Brachioradialis

Action: Elbow flexion, stabilizes elbow joint

Attachments: Proximally: humerus; Distally: near styloid process of radius

Innervation: Radial nerve

Triceps brachii (long head)

Action: extends elbow, extends humerus

Attachments: Proximally: inferior glenoid cavity; Distally: olecranon process of ulna

Triceps brachii (lateral head)

Action: Extends elbow

Attachments: Proximally: humerus; Distally: olecranon process of ulna

Triceps brachii (medial head)

Action: Extends elbow

Attachments: Proximally: humerus; Distally: olecranon process of ulna

Pronator quadratus

Action: Pronates forearm

Innervation: Median nerve

Pronator teres

Action: Pronates forearm

Innervation: Median nerve

Supinator

Action: Supinates forearm

Innervation: Radial nerve

Wrist/finger flexors

Action: Flex the wrist and/or fingers

Attachments: Proximally: Medial epicondyle

Wrist/finger extensors

Action: Extend the wrist and/or fingers

Attachments: Proximally: Lateral epicondyle

Innervation: Radial nerve

Thenar muscles

Hypothenar muscles

Midpalmar muscles