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Question 1

Sacral plexus

Answer 1

• L4-S4

- Forms superior gluteal N, inferior gluteal N, sciatic N, posterior femoral N, pudendal N

Question 2

Superior gluteal N

Answer 2

• posterior divisions of the anterior rami of L4, L5, and S1

- innervates TFL, glute med, and glute min

Question 3

Inferior gluteal N

Answer 3

• Posterior divisions of the L5lS1, and S2 spinal nerves

- innervates the glute max

Question 4

Nerve to piriformis

Answer 4

• Posterior divisions of anterior rami of the S1 and S2 spinal nerves
• Innervates piriformis

Question 5

Perforating cutaneous N

Answer 5

• Posterior divisions of S2 and S3

- cutaneous supply to a small area of skin on the inferior medial part of the buttock

Question 6

Pelvic splanchnic N

Answer 6

• originate from the anterior rami of spinal nerves S2, S3, and S4
• parasympathetic outflow joins inferior hypogastric plexus.
• motor component supples the bladder and the distal part of the large intestines

Question 7

Sciatic N

Answer 7

• formed from anterior and posterior positions of the anterior rami of spinal nerves L4 and S3
• Divided into common peroneal and tibial component
• Supplies hamstrings and ischial fibers of adductor magnus

Question 8

Common peroneal N

Answer 8

• L4-S2
• Innervates the short head of the bicep femoris as well as the muscles in the lateral and anterior compartments of the leg
• fibularis longus and brevis, tibialis anterior, extensor digitorum longus, and extensor hallucis longus

Question 9

Tibial N

Answer 9

• L4-L3
• medial and lateral gastrocnemius, soleus, plantaris, and popliteus muscles, tibialis posterior, superior tibiofibular joint
• cutaneous branch is the medial sural nerve

Question 10

Nerve to quadratus femoris

Answer 10

• anterior divisions of the anterior rami of the L4, L5, and S1
• supplies inferior gemellus

Question 11

Nerve to obturator internus

Answer 11

• anterior divisions of the anterior rami of spinal nerves L5, S1, and S2
• innervates the superior gemellus and the obturator internus

Question 12

Posterior cutaneous nerve of the thigh

Answer 12

• fibers from both anterior and posterior divisions of the anterior rami (anterior S2 and S3, posterior S1 and S2)
• anteroposterior and superoinferior range of cutaneous and fascial supply between the anterior and posterior axillary lines from the buttock to the middle of the calf muscles.

Question 13

Pudendal N

Answer 13

• anterior divisions of the anterior rami of the spinal nerve S2, S3, and S4
• inferior rectal N innervates the external anal sphincter, anal canal, and perianal skin
• perineal N cutaneous supply to part of the posterior scrotum, mucus membrane of the urethra and vagina, motor innervation to the muscles of the perineum
• dorsal N of the clitoris/penis provides cutaneous innervation to this region

Question 14

Nerve to levator ani and ischiococcygeus muscles

Answer 14

• the last two branches of the sacral plexus are the nerve to the levator ani and the ischiococcygeus muscle.

Question 15

Perineal branch of S4

Answer 15

• the perineal branch of S4 courses via coccygeus and iliococcygeus muscles.

Question 16

Major branches if sacral plexus

Answer 16

SIPPS
S- superior gluteal N
I - inferior gluteal N
P- posterior cutaneous N of thigh
P- pudendal N
S - sciatic N

Question 17

Brachial plexus

Answer 17

• C5-8 and anterior branch of T1

- forms thoracodorsal N, lower subscapular N, ulnar N, musculocutaneous N, axillary N, radial N, median N.

Question 18

Thoracodorsal N

Answer 18

• supplies the latissimus dorsi

Question 19

Lower subscapular N

Answer 19

• lower portion of the subscapularis muscle, supplies teres major
• branches from the posterior cord of the brachial plexus

Question 20

Ulnar N

Answer 20

• sensory innervation to the fifth digit and medial half of the fourth digit and corresponding part of the palm
• flexor carpi ulnaris, flexor digitorum profundus, opponens digiti minimi, abductor digiti minimi, flexor digiti minimi brevis, 3rd and 4th lumbrical muscles. dorsal and palmar interossei, adductor pollicis, flexor pollicis brevis

Question 21

Radial N

Answer 21

• innervates the medial and lateral heads of the triceps brachii, anconeus, brachioradialis, extensor carpi radialis longus, extensor carpi radialis brevis, supinator, extensor digitorum, extensor digiti minimi, extensor carpi ulnaris, abductor pollicis longus, extensor pollicis longus, extensor pollicis brevis, extensor indicis

Question 22

Musculocutaneous N

Answer 22

• innervates the coracobrachialis, biceps brachii, greater portion of the brachialis.
• sensation of the lateral side of the forearm from the elbow to the wrist.

Question 23

Axillary N

Answer 23

• deltoid, triceps, teres minor