The peripheral nervous system or PNS, is part of the nervous system, and consists of the nerves and neurons that reside or extend outside the central nervous system--to serve the limbs and organs, for example. Unlike the central nervous system however, the PNS is not protected by bone or the blood-brain barrier, leaving it exposed to toxins and mechanical injuries. The peripheral nervous system is divided into the somatic nervous system and the autonomic nervous system.
The 10 out of the 12 cranial nerves originate from the brainstem, and mainly control the functions of the anatomic structures of the head with some exceptions. CN X receives visceral sensory information from the thorax and abdomen, and CN XI is responsible for innervating the sternocleidomastoid and trapezius muscles, neither of which are exclusively in the head.
More on [ Peripheral nervous system ]

Nervous System Diseases - Links to information including diseases of peripheral nervous system.
Neuroscience for Kids - Explore the Brain and Spinal Cord - Information about the peripheral nervous system, including disorders.
Meta Description: [ Intended for elementary and secondary school students and teachers who are interested in learning about the nervous system and brain with hands on activities, experiments and information. ]
Peripheral Nervous System - Information for medical professionals about the peripheral nervous system, including details of skeletal muscle paralysis and opioid-induced bradycardia.
UCLA Neurosurgery Peripheral Nerve Program - Provides services for the evaluation and surgical care of individuals suffering from peripheral nerve pathology. Features information about the diagnosis and treatment of these disorders, list of faculty, and patient referral details.
Meta Description: [ UCLA Division of Neurosurgery web site provides information on patient care,
research, and education for neurosurgical diseases: Adult Hydrocephalus;
Brain Injury; Neurocritical Care; Brain Tumors (Benign, Skull Base,
Malignant, Metastatic, Pituitary, Neuroendocrine); Cerebrovascular;
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