The basic route of nerve signals within the efferent somatic nervous system involves a sequence that begins in the upper cell bodies of motor neurons ( upper motor neurons) within the precentral gyrus (which approximates the primary motor cortex). The somatic nervous system controls all voluntary muscular systems within the body, and the process of voluntary reflex arcs. ( May 2021) ( Learn how and when to remove this template message) Unsourced material may be challenged and removed. Please help improve this section by adding citations to reliable sources. They include smell, eye muscles, mouth, taste, ear, neck, shoulders, and tongue. Cranial nerves: They are the nerve fibers that carry information into and out of the brain stem.
Spinal nerves: They are mixed nerves that carry sensory information into and motor commands out of the spinal cord.Thus the somatic nervous system consists of two parts: Besides these, thousands of association nerves are also present in the body. In the body, 31 segments of nerves are in the spinal cord and 12 are in the brain stem. With each segment, there is a pair of sensory and motor nerves. There are 43 segments of nerves in the human body. The a- of afferent and the e- of efferent correspond to the prefixes ad- (to, toward) and ex- (out of). The somatic nervous system consists of sensory nerves carrying afferent nerve fibers, which relay sensation from the body to the central nervous system (CNS), and motor nerves carrying efferent nerve fibers, which relay motor commands from the CNS to stimulate muscle contraction. Quiz 4 spinal cord, nerves, autonomic nervous system flashcards.The somatic nervous system ( SNS), or voluntary nervous system is the part of the peripheral nervous system associated with the voluntary control of body movements via skeletal muscles.
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