Nervous System: Spinal Nerves and Plexuses (Cadaver)

Phrenic nerve

Cervical plexus -Innervates the diaphragm, "C3, C4, and C5 keep you alive"

Femoral nerve

Lumbar plexus -Innervates quadriceps and sartorius

Sciatic nerve

Sacral plexus -Composed of tibial and common fibular nerves

Tibial nerve

Sacral plexus Branch of sciatic nerve -Innervates hamstrings, adductor magnus, tibialis posterior, popliteus, flexor digitorum longus, flexor hallucis longus, intrinsic muscles of the foot

Common fibular nerve

Sacral plexus Branch of sciatic nerve -Innervates short head of biceps femoris, tibialis anterior, fibularis longus/brevis/tertius, extensor hallucis longus, extensor digitorum longus/brevis

Upper trunk

Brachial plexus Trunks Most superior

Medial cord

Brachial plexus Cords Medial

Axillary nerve

Brachial plexus Braches/Peripheral nerves -Innervates deltoid, teres minor, and skin of shoulder region

Ulnar nerve

Brachial plexus Braches/Peripheral nerves -Innervates flexor carpi ulnaris, medial half of flexor digitorum profundus, most intrinsic muscles of hand, and skin of medial third of hand

Median nerve

Brachial plexus Braches/Peripheral nerves -Innervates palmaris longus, flexor carpi radialis, flexor digitorum superficialis, flexor pollicis longus, pronator muscles, intrinsic muscles of lateral palm

Radial nerve

Brachial plexus Braches/Peripheral nerves -Innervates triceps brachii, anconeus, supinator, brachioradialis, extensor carpi radialis longus/brevis, extensor carpi ulnaris, and skin of posterolateral surface of entire limb

Musculocutaneous nerve

Brachial plexus Branches/Peripheral nerves -Innervates biceps brachii, brachialis, coracobrachialis

Lateral cord

Brachial plexus Cords Most lateral

Posterior cord

Brachial plexus Cords Most posterior

Posterior division

Brachial plexus Divisions Most inferior

Anterior division

Brachial plexus Divisions Superior

Middle trunk

Brachial plexus Trunks In between

Lower trunk

Brachial plexus Trunks Most inferior