spinal nerves and reflexes

Phrenic nerve (cervical plexus)

innervates diaphragm and pericardium (heart)

Axillary nerve (brachial plexus)

• Runs posterior humerus

• innervates deltoid and teres minor

Musculocutaneous nerve (brachial plexus)

• Traves inferiorly in the anterior arm

• Innervates coracobrachialis, the biceps brachii and the brachialis

Median Nerve (brachial plexus)

• Innervates flexors of forearm, except flexor carpi ulnaris, and medial two digits

(middle finger), runs through carpal tunnel

Ulnar nerve (brachial plexus)

• Innervates flexor carpi ulnaris and flexor digitorum longus, digit V and medial half of digit IV

• Helps with grip and writing

• Gives feeling to pinky finger

Radial nerve (brachial plexus)

Innervates triceps brachii, extrinsic extensors of the wrist and hands

Obturator (lumbar plexus)

Innervates medial thigh and thigh adductor muscles

femoral (lumbar plexus)

• Largest nerve of lumbar plexus

• Innervates anterior thigh muscles: iliopsoas, pectineus, sartorius, quadriceps femoris

Sciatic nerve (sacral plexus)

Innervates biceps femoris, semitendinosus, semimembranosus, medial side of adductor magnus

Common fibular nerve (sacral plexus)

Innervates fibularis longus, fibularis brevis, tibialis anterior, extensors of the calf and ankle

Superior gluteal (sacral plexus)

Innervates gluteus medius, gluteus minimus, tensor fascia latae

Inferior gluteal (sacral plexus)

Innervates gluteus maximus

Tibial Nerve (sacral plexus)

• Major peripheral nerve

• Innervates muscles of the posterior leg and intrinsic foot muscles

• Plantaris, Soleus, Gastronemicus

• Popliteus, flexor hallucis longus, flexor digitorum longus, tibialis posterior