1/10/2024 0 Comments Somatic nervous system example![]() Simply put, the somatic nervous system innervates skeletal muscle, whereas the ANS innervates glands, neurons of the gastrointestinal tract, and cardiac and smooth muscles of glandular tissue. The further classification used of the efferent division is the somatic and autonomic nervous system (ANS). It is worth noting that the efferent division is subclassified into what they ultimately supply. Efferent information however transmits information from the CNS externally to, for example, glands and muscles. Their axons are found outwith the CNS, but then enter the CNS. With spinal nerves, they contain both afferent and efferent information, whereas some cranial nerves like the olfactory and optic nerves contain only afferent information (for smell and sight, respectively).Īfferent information transmits impulses from receptors to the CNS. Therefore, the nerves of the PNS can be classified as belonging to either afferent (taking information to the CNS) or efferent (away from the CNS). Whether they have this myelin or not, they do have the same general feature in that a nerve contains nerve fibers with axons of either afferent or efferent neurons. The nerves of the PNS can be either myelinated (formed by the surrounding Schwann cells) or unmyelinated in nature. In total, there are 43 pairs of nerves in the PNS-12 cranial nerves and 31 spinal nerves. ![]() The nerves in the PNS transmit information from all parts of the body to and from the CNS. Paul Rea, in Clinical Anatomy of the Cranial Nerves, 2014 Peripheral Nervous System
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