Cell Types of Nervous System
1. In the free nerve ending, the peripheral process branches widely and ends without obvious specialization. These endings respond primarily to intense stimuli, and are thought to play a role…
Anatomy of Peripheral Nerve
A single nerve, such as the median or ulnar nerve, is composed of thousands of axons that are grouped into several distinct nerve fascicles (see Plate 6-1, top left). Each…
Histology of Peripheral Nerve
The structures of the nerve can be identified microscopically. At different magnifications, the definition and various individual components of the nerves can be identified. The upper image (see Plate 6-2)…
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…
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…
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…
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…
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….
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…
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…
