Pectoral Girdle and Upper Appendicular Muscles

Chapter 12

What muscle is this?

trapezius

What is the action of the superior fibers of the trapezius?

elevates the scapula

What is the action of the middle fibers of the trapezius?

adducts the scapula

What is the action of the inferior fibers of the trapezius?

depresses the scapula

What muscle is this?

levator scapulae

What is the action of the levator scapulae?

elevates the scapula

What muscle is this?

rhomboid major

What is the action of the rhomboid major?

stabilizes the scapula

What muscle is this?

rhomboid minor

What is the action of the rhomboid minor?

stabilizes the scapula

What muscle is this?

serratus anterior

What is the action of the serratus anterior?

stabilizes the scapula

What muscle is this?

pectoralis minor

What is the action of the pectoralis minor?

depresses the scapula

What muscle is this?

supraspinatus

What is the origin of the supraspinatus?

supraspinous fossa of the scapula

What is the insertion of the supraspinatus?

greater tubercle of the humerus

What is the action of the supraspinatus?

abducts the arm

What muscle is this?

infraspinatus

What is the origin of the infraspinatus?

infraspinous fossa of the scapula

What is the insertion of the infraspinatus?

greater tubercle of the humerus

What is the action of the infraspinatus?

laterally rotates the arm

What muscle is this?

teres minor

What is the origin of the teres minor?

lateral border of the scapula

What is the insertion of the teres minor?

greater tubercle of the humerus

What is the action of the teres minor?

laterally rotates the arm

What muscle is this?

subscapularis

What is the origin of the subscapularis?

subscapular fossa of the scapula

What is the insertion of the subscapularis?

lesser tubercle of the humerus

What is the action of the subscapularis?

medially rotates the arm

What muscle is this?

triceps brachii

What is the origin of the long head of the triceps brachii?

infraglenoid tubercle of the scapula

What is the origin of the lateral head of the triceps brachii?

posterior shaft of the humerus

What is the origin of the medial head of the triceps brachii?

distal 2/3 of the posterior shaft of the humerus

What is the common insertion of the triceps brachii?

olecranon process of the ulna

What is the action of the triceps brachii?

extends the forearm

What muscle is this?

anconeus

What is the action of the anconeus?

extends the forearm

What muscle is this?

biceps brachii

What is the origin of the long head of the biceps brachii?

supraglenoid tubercle of the scapula

What is the origin of the short head of the biceps brachii?

coracoid process of the scapula

What is the common insertion of the biceps brachii?

radial tuberosity of the radius

What is the action of the biceps brachii?

flexes the forearm

What muscle is this?

coracobrachialis

What is the origin of the coracobrachialis?

coracoid process of the scapula

What is the insertion of the coracobrachialis?

middle medial shaft of the humerus

What is the action of the coracobrachialis?

flexes the arm

What muscle is this?

brachialis

What is the origin of the brachialis?

distal, anterior surface of the humerus

What is the insertion of the brachialis?

coronoid process of the ulna

What is the action of the brachialis?

flexes the forearm

What muscle is this?

brachioradialis

What is the origin of the brachioradialis?

lateral distal humerus

What is the insertion of the brachioradialis?

styloid process of the radius

What is the action of the brachioradialis?

flexes the forearm

What muscle is this?

pronator teres

What is the action of the pronator teres?

pronates the forearm at the radioulnar joint

What muscle is this?

flexor carpi radialis

What is the action of the flexor carpi radialis?

flexes the hand

What muscle is this?

palmaris longus

What is the action of the palmaris longus?

weakly flexes the hand

What muscle is this?

flexor carpi ulnaris

What is the action of the flexor carpi ulnaris?

flexes the hand

What muscle is this? (not deep)

flexor digitorum superficialis

What is the action of the flexor digitorum superficialis?

flexes the hand

What muscle is this? (most deep)

flexor digitorum profundus

What is the action of the flexor digitorum profundus?

flexes the hand

What muscle is this? (deep)

flexor pollicis longus

What is the action of the flexor pollicis longus?

flexes the distal phalanx of the thumb

What is the associated structure of the anterior compartment of the forearm?

flexor retinaculum

What muscle is this? (more lateral)

extensor carpi radialis longus

What is the action of the extensor carpi radialis longus?

extends the hand

What muscle is this? (more medial)

extensor carpi radialis brevis

What is the action of the extensor carpi radialis brevis?

extends the hand

What muscle is this?

extensor digitorum

What is the action of the extensor digitorum?

extends the hand

What muscle is this?

extensor carpi ulnaris

What is the action of the extensor carpi ulnaris?

extends the hand

What muscle is this? (most lateral)

abductor pollicis longus

What is the action of the abductor pollicis longus?

weakly extends the hand

What muscle is this? (most medial)

extensor pollicis longus

What is the action of the extensor pollicis brevis?

weakly extends the hand

What muscle is this? (in the middle)

extensor pollicis brevis

What is the action of the extensor pollicis brevis?

weakly extends the hand

What muscle is this? (deep)

supinator

What is the action of the supinator?

supinates the forearm at the radioulnar joint

What is the associated structure of the posterior compartment of the forearm?

extensor retinaculum