Similarly, within the leg and foot, when there is numbness and tingling of the toes, either the fibular (peroneal) or tibial nerve are affected or nerve roots L5 and S1…

TIBIAL NERVE This is the larger and medial terminal branch of the sciatic nerve. Its fibers are derived from the anterior divisions of the anterior rami of the fourth and…

Rarely, sciatic neuropathies develop secondary to external pressure, producing a compression injury in comatose or immobilized patients. Very slender individuals who pass out after using toxic substances while seated on…

This nerve next passes between the two heads of the fibularis (peroneus) longus (L5) muscle; here it is particularly vulnerable to being compressed against the fibular bone, leading to footdrop….

SCIATIC/POSTERIOR FEMORAL CUTANEOUS NERVES Anatomy The sciatic and the gluteal nerves share common derivations originating from the anterior rami of the fourth lumbar through the third sacral nerve roots, immediately…

Clinical. An iliacus syndrome (L2, 3) occurs when the femoral nerve is entrapped during its initial course within the pelvis and groin, affecting the iliopsoas and quadriceps femoris muscles. The…

On neurologic examination, the patient is asked to outline the distribution of discomfort. He or she can invariably do so by taking a finger to delineate areas of abnormal sensation;…

Patients unexpectedly assuming a prolonged posture, with an arm resting posteriorly against a hard surface, are liable to develop acute radial nerve palsies. Examples include sleeping with weight on an…

Within the proximal forearm, the ulnar nerve courses along the length of the medial forearm, lying on the ulnar collateral ligament immediately below the elbow; it subsequently passes between the…

PROXIMAL ULNAR NERVE LESIONS Chronic ulnar nerve elbow lesions primarily exist at the cubital tunnel or condylar groove. Patients with these lesions present with numbness and tingling, and/or sensory loss…