Segmental Innervation of the Upper Limb

MUSCLE	C4	C5	C6	C7	C8	T1	NERVE
Rhomboideus Major & Minor	(x)	X	-	-	-	-	Dorsal Scapular
Supraspinatus	-	X	X	-	-	-	Suprascapular
Infraspinatus	-	X	X	-	-	-	Suprascapular
Teres minor	-	X	X	-	-	-	Axillary
Deltoid* (C5)	-	X	X	-	-	-	Axillary
Subclavius	-	X	X	-	-	-	Subclavius N.
Subscapularis	-	X	X	(x)	-	-	Upper & Lower Subscapular Nerves
Teres Major	-	X	X	-	-	-	Lower Subscapular N.
Pectoralis Major Clavicular Head	-	X	X	-	-	-	Lateral Pectoral
Pectoralis Major Sternal Head	-	-	-	X	X	X	Medial Pectoral
Pectoralis Minor	-	-	-	X	X	X	Medial Pectoral
Serratus Anterior	-	X	X	X	-	-	Long Thoracic
Latissimus Dorsi	-	-	X	X	X	-	Thoracodorsal
Biceps Brachii* (C6)	-	X	X	-	-	-	Musculocutaneous
Brachialis	-	X	X	-	-	-	Musculocutaneous
Brachioradialis	-	X	X	-	-	-	Radial
Supinator	-	X	X	-	-	-	Radial
Coracobrachialis	-	-	X	X	-	-	Musculocutaneous
Ext. Carpi Radialis Longus (C6)	-	-	X	X	-	-	Median
Pronator Teres	-	-	X	X	-	-	Median
Flexor Carpi Radialis* (C7)	-	-	X	X	-	-	Median
Ext. Carpi Radialis Brevis	-	-	X	X	X	-	Radial
Anconeus	-	-	-	X	X	-	Radial
Triceps Brachii* (C7)	-	-	X	X	X	-	Radial
Ext. Digitorum* (C7)	-	-	-	X	X	-	Radial
Ext. digiti V.	-	-	-	X	X	-	Radial
Ext. Indicis	-	-	-	X	X	-	Radial
Ext. Carpi Ulnaris	-	-	-	X	X	-	Radial
Abductor Pollicis Longus	-	-	-	X	X	-	Radial
Ext. Pollicis Brevis	-	-	-	X	X	-	Radial
Ext. Pollicis Longus	-	-	-	X	X	-	Radial
Flexor Carpi Ulnaris	-	-	-	X	X	-	Ulnar
Flexor Digitorum Superficialis* (C8)	-	-	-	X	X	X	Median
Flexor Digitorum Profundus* (C8)	-	-	-	X	X	X	Median & Ulnar
Flexor Pollicis Longus	-	-	-	-	X	X	Median
Pronator Quadratus	-	-	-	-	X	X	Median
Abductor Pollicis Brevis	-	-	-	-	X	X	Median
Flexor Pollicis Brevis	-	-	-	-	X	X	Median
Opponens Pollicis	-	-	-	-	X	X	Median
Adductor Pollicis	-	-	-	-	X	X	Ulnar
Adductor Digiti V.	-	-	-	-	X	X	Ulnar
Flexor Digiti V.	-	-	-	-	X	X	Ulnar
Opponens Digiti V.	-	-	-	-	X	X	Ulnar
Lumbricals	-	-	-	-	X	X	Median; Ulnar
Interossei* (T1)	-	-	-	-	X	X	Ulnar

X (bolded) = Primary spinal nerve root supplying a muscle
*( ) = Main muscle(s) used to test the function of a specific spinal nerve root

1. Sternocleidomastoid and Trapezius are innervated by Spinal portions of the Accesory Nerve (Cr. XI).

2. Levator scapula is innervated via the cervical plexus (C 3,4).