Chapter 4- hand/UE muscle functions/nerve innervations

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Chapter 4 of TherapyEd study guide, 5th edition

Intrinsic hand muscles innervated by the median nerve

abductor pollicis brevis, opponens pollicis, flexor pollicis brevis: superficial head, lumbricals (radial side)

Function of opponens pollicis

opposition

Function of flexor pollicis brevis: SUPERFICIAL head

thumb MCP flexion, deep head innervated by ULNAR nerve

Function of lumbricals (radial side)

MCP flexion and extension of IP joints

Intrinsic hand muscles innervated by the ulnar nerve

abductor digiti minimi, opponens digiti minimi, flexor digiti minimi, lumbricals (ulnar side), palmar interossei, dorsal interossei

Function of abductor digiti minimi

abduction of the 5th digit

Function of opponens digiti minimi

opposition of the 5th digit

Function of flexor digiti minimi

flexion of MCP joint and opposition of the 5th digit

Function of lumbricals (ulnar side)

MCP flexion and extension of IP joints of digits IV and V

Function of palmar interossei

adduction and assistance with MCP flexion and extension of IP joints of digits II through V

Function of dorsal interossei

abduction and assists with MCP flexion and extension of IP joints of digits II through V

Extrinsic flexor muscles innervated by the median nerve

flexor digitorum superficialis (FDS), flexor digitorum profundus (FDP), flexor pollicis longus (FPL)

Function of flexor digitorum superficialis

flexion of PIP joints

Function of Flexor digitorum profundus

flexion of DIP joints to digits II and III

Function of flexor pollicis longus

flexion of IP joint of thumb

Extrinsic flexors of the hand innervated by the ulnar nerve

flexor digitorum profundus

Function of flexor digitorum profundus

flexion of DIP joints to digits IV and V

Extrinsic muscles of the hand innervated by the radial nerve

extensor digitorum communis (EDC), extensor digiti minimi (EDM), extensor indicis, extensor pollicis longus (EPL), extensor pollicis brevis (EPB), abductor pollicis longus (APL)

Function of extensor digitorum communis

extension of MCP joints and contributes to extension of the IP joints

Function of extensor digiti minimi

extension of MCP joint of the 5th digit and contributes to extension of the IP joints

Function of extensor indicis

extension of MCP joint of the 2nd digit and contributes to extension of the IP joints

Function of extensor pollicis longus

extension of IP joint of the thumb

Function of extensor pollicis brevis

extension of MCP and CMC joints of the thumb

Function of abductor pollicis longus

abduction and extension of CMC joint

Wrist flexors innervated by the median nerve

flexor carpi radialis (FCR) and palmaris longus (PL)

Function of flexor carpi radialis

flexion of wrist and radial deviation

Function of palmaris longus

flexion of wrist

Wrist flexors innervated by the ulnar nerve

flexor carpi ulnaris (FCU)

Function of flexor carpi ulnaris

flexion of wrist and ulnar deviation

Wrist extensors innervated by the radial nerve

extensor carpi radialis brevis (ECRB), extensor carpi radialis longus (ECRL), extensor carpi ulnaris (ECU)

Function of extensor carpi radialis brevis/longus (same function)

extension of wrist and radial deviation

Function of extensor carpi ulnaris

extension of wrist and ulnar deviation

Volar forearm muscles innervated by the median nerve

pronator teres and pronator quadratus

Function of pronator teres and pronator quadratus (same function)

forearm pronation

Dorsal forearm muscles innervated by the radial nerve

supinator

Function of the supinator

forearm supination

Elbow flexors and what nerve they are innervated by

biceps and brachialis (innervated by musculocutaneous nerve) and brachioradialis (innervated by radial nerve)

Biceps and brachialis forearm position?

elbow flexion with forearm pronated

Brachioradialis forearm position?

elbow flexion with forearm neutral

Elbow extensors and what nerve they are innervated by

triceps and anconeus are both innervated by the radial nerve

Rotator cuff muscles and what nerve they are innervated by

"SITS": subscapularis (subscapular nerve), infraspinatus (suprascapular nerve), teres minor (axillary nerve), supraspinatus (suprascapular nerve)

Function of subscapularis

internal rotation

Function of infraspinatus

external rotation

Function of teres minor

external rotation

Function of supraspinatus

abduction and flexion

Shoulder flexion muscles and what nerve they are innervated by

anterior deltoid (axillary nerve), coracobrachialis (musculocutaneous nerve), supraspinatus (musculocutaneous nerve)

Shoulder abduction muscles and what nerve they are innervated by

middle deltoid (axillary nerve) and supraspinatus (musculocutaneous nerve)

Shoulder horizontal abduction muscles and what nerve they are innervated by

posterior deltoid (axillary nerve)

Shoulder horizontal adduction muscles and what nerve they are innervated by

pectoralis major (lateral pectoral nerve)

Shoulder extension muscles and what nerve they are innervated by

latissimus dorsi (thoracodorsal nerve), teres major (subscapular nerve), posterior deltoid (axillary nerve)

Scapula upward rotation muscles and what nerve they are innervated by

trapezius (upper, middle and lower)(spinal accessory nerve (CN XI)) and serratus anterior (long thoracic nerve)

Scapula downward rotation muscles and what nerve they are innervated by

levator scapulae (C3-C4 nerves), rhomboids (major and minor)(dorsal scapular nerve), serratus anterior (long thoracic nerve), latissimus dorsi (thoracodorsal nerve)

Scapula adduction muscles and what nerve they are innervated by

middle trapezius (spinal accessory nerve (CN XI)) and rhomboid major (dorsal scapular nerve)

Scapula abduction muscles and what nerve they are innervated by

serratus anterior (long thoracic nerve)

Scapula elevation muscles and what nerve they are innervated by

upper trapezius (spinal accessory nerve (CN XI)) and levator scapulae (C3-C4 nerves)

Scapula depression muscles and what nerve they are innervated by

lower trapezius (spinal accessory nerve (CN XI))

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