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Motor Innervation of the Brachial Plexus

What muscles are innervated by the branches of the brachial plexus?
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InsufficientOwl
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Last updated: February 7, 2023
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First submittedFebruary 7, 2023
Times taken7
Average score51.4%
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Origin: roots
Nerves
Roots
Muscles
Dorsal scapular nerve
C4, C5
Rhomboid muscles
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
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)
Teres major
Axillary nerve
C5, C6
Deltoid
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
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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