Upper Limb Innervations

Question 1

Anterior rami of spinal nerves

Answer 1

Deep neck flexor muscles (rectus capitis anterior, rectus capitis lateralis, longus capitis, longus colli), scalenes (anterior: C5-C7, middle: C3-C7, posterior: C4-C7)

Question 2

Posterior rami of spinal nerves

Answer 2

Intrinsic back muscles
(spinotransversales: splenius capitis, splenius cervicis)
(erector spinae: spinalis, logissimus, iliocostalis)
(transversospinales: semispinalis, multifidus, rotatores)

Question 3

Anterior rami of C1 to C3

Answer 3

Infrahyoid muscles (omohyoid, sternohyoid, sternothyroid, thyrohyoid)

Question 4

Suboccipital nerve

Answer 4

Suboccipital muscles (obliquus capitis superior, obliquus capitis inferior, rectus capitis posterior major, rectus capitis posterior minor)

Question 5

Accessory nerve (CN XI)

Answer 5

Trapezius (upper, middle, lower), sternocleidomastoid

Question 6

Medial pectoral nerve

Answer 6

Pectoralis minor, pectoralis major

Question 7

Lateral pectoral nerve

Answer 7

Pectoralis major

Question 8

Thoracodorsal nerve

Answer 8

Latissimus dorsi

Question 9

Long thoracic nerve

Answer 9

Serratus anterior

Question 10

Dorsal scapula nerve

Answer 10

Levator scapulae, rhomboids minor, rhomboid major

Question 11

Superior subscapular nerve

Answer 11

Subscapularis

Question 12

Inferior subscapular nerve

Answer 12

Subscapularis, teres major

Question 13

Suprascapular nerve

Answer 13

Supraspinatus, infraspinatus

Question 14

Axillary nerve

Answer 14

Deltoids (anterior, middle, posterior), teres minor

Question 15

Musculocutaneous nerve

Answer 15

Biceps brachii, coracobrachialis, brachialis

Question 16

Radial nerve

Answer 16

Triceps brachii, brachioradialis, anconeus, ECRL

Question 17

Deep branch of radial nerve

Answer 17

ECRB

Question 18

Posterior interosseous nerve (radial)

Answer 18

ED, EDM, ECU, supinator, APL, EPL, EPB, EI

Question 19

Median nerve

Answer 19

PT, FCR, PL, FDS

Question 20

Recurrent branch of median nerve

Answer 20

Thenar group muscles (APB, FPB, OP)

Question 21

Anterior interosseous nerve (median)

Answer 21

FDP 2+3, FPL, PQ

Question 22

Ulnar nerve

Answer 22

FCU, FDP 4+5

Question 23

Deep branch of ulnar nerve

Answer 23

Hypothenar group (ADM, FDM, ODM), AP, lumbricals 3+4, DIM, PIM

Question 24

Digital branch of ulnar nerve

Answer 24

Lumbricals 1+2

Question 25

Mandibular nerve (CN V3)

Answer 25

Muscles of mastication (temporalis, masseter, medial pterygoid, lateral pterygoid), digastric, mylohyoid (suprahyoid muscles)

Question 26

Facial nerve (CN VII)

Answer 26

Facial expression muscles, stylohyoid (suprahyoid muscle)

Question 27

Anterior rami of C3 and C4

Answer 27

Sensory innervation for trapezius and levator scapulae