Peripheral Nervous System Lower Motor Neurons and Plexuses
Each motor neuron that leaves the spinal cord joins other nerves to form plexuses.
Plexuses continue as trunks, cords, divisions and finally branch into individual peripheral nerves.
The major plexuses are: cervical, brachial, lumbar and sacral. Here are major concentrations of nerves.
The nerves of each plexus pass through or are surrounded by bone.
Injury to the area or entrapment of a nerve can cause multiple problems.