Motor Innervation of the Brachial Plexus

What muscles are innervated by the branches of the brachial plexus?

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Last updated: February 7, 2023

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First submitted	February 7, 2023
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Average score	80.0%
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Origin: roots
Nerves	Roots	Muscles
Dorsal scapular nerve	C4, C5	Rhomboid muscles
Dorsal scapular nerve	C4, C5	Levator scapulae
Long thoracic nerve	C5, C6, C7	Serratus anterior
Branch to phrenic nerve	C3, C4, C5	Diaphragm

Origin: trunks
Nerves	Roots	Muscles
Subclavian nerve	C5, C6	Subclavius
Suprascapular nerve	C5, C6	Supraspinatus
Suprascapular nerve	C5, C6	Infraspinatus

Origin: lateral cord
Nerves	Roots	Muscles
Lateral pectoral nerve	C5, C6, C7	Pectoralis major
		Pectoralis minor
Musculocutaneous nerve	C5, C6, C7	Coracobrachialis
		Brachialis
		Biceps brachii

Origin: posterior cord
Nerves	Roots	Muscles
Upper scapular nerve	C5, C6	Subscapularis (upper part)
Thoracodorsal nerve (middle subscapular nerve)	C6, C7, C8	Latissumus dorsi
Lower subscapular nerve	C5, C6	Subscapularis (lower part)
Lower subscapular nerve	C5, C6	Teres major
Axillary nerve	C5, C6	Deltoid
Axillary nerve	C5, C6	Teres minor
Radial nerve	C5, C6, C7, C8, T1	Triceps brachii
		Supinator
		Anconeus
		Extensor muscles of forearm
		Brachioradialis

Origin: medial cord
Nerves	Roots	Muscles
Medial pectoral nerve	C8, T1	Pectoralis major
Medial pectoral nerve	C8, T1	Pectoralis minor
Ulnar nerve	C7 (occasionally), C8, T1	Flexor carpi ulnaris
		Medial part of flexor digitorum profundus
		Adductor pollicis
		Flexor digiti minimi brevis
		Abductor digiti minimi
		Opponens digiti minimi
		Dorsal and palmar interossei
		3rd and 4th lumbricals

Origin: lateral and medial cords
Nerves	Roots	Muscles
Median nerve	C5, C6, C7, C8, T1	All flexors in forearm (except flexor carpi ulnaris and medial part of flexor digitorum profundus)
		1st and 2nd lumbricals
		Thenar eminence (flexor pollicis brevis, abductor pollicis brevis, opponens pollicis)

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