Spinal Nerves ( Important Motor Branches )



Cervical Plexus (C1-C5)


Phrenic (C3-C5): Diaphragm



Brachial Plexus (C5-T1)


Pectoral (C5-T1): Chest muscles (pectoralis major and minor).


Axillary (C5-C6): Shoulder muscles (deltoid)


Musculocutaneous (C5-C7): Anterior arm flexor muscles (biceps brachii & brachialis)


Median (C5-T1): Anterior forearm flexor muscles


Ulnar (C8-T1): Hand and wrist muscles, plus some forearm flexor muscles


Radial (C5-T1): Posterior arm and forearm extensor muscles (triceps brachii & brachioradialis).



Lumbar Plexus (L1-L4)


Femoral (L2-L4): Anterior thigh extensor muscles (quadriceps)


Obturator (L2-L4): Medial thigh adductor muscles



Sacral Plexus (L4-S4)


Guteal (superior & inferior) (L4-S2): Buttocks muscles (gluteus maximus, medius & minimus)


Sciatic nerve (L4-S3): Largest nerve of the body; composed of two nerves (tibial & common fibular) in a common sheath


Tibial (L4-S3): Posterior thigh flexor muscles (hamstrings) and calf muscles (gastrocnemius & soleus)


Fibular (common, superficial & deep) (L4-S2): Lateral leg muscles (tibialis anterior & fibularis longus)