Dermatomes
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…
Cutaneous Innervation
Clinical definition of the distribution of sensory changes affecting a specific area within one extremity implies a single nerve root, portion of a plexus, or peripheral nerve damage. Focal complaints…
Tibial Nerve
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…
Fibular (Peroneal) Nerve
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 and Posterior Femoral Cutaneous Nerves
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…
Gluteal Nerves
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…
Iliohypogastric, Ilioinguinal, Genitofemoral, and Obturator Nerves
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;…
Femoral and Lateral Femoral Cutaneous Nerves
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…
Radial Nerve Compression/Entrapment Neuropathies
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…
Radial Nerve
Within the axilla, the radial nerve lies posterior to the axillary artery, and subsequently upon the subscapularis and latissimus dorsi muscles while anterior to the teres major muscle. Here it…
