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The PNS consists of 31 pairs of spinal nerves (Fig. 2-3), which arise from the spinal cord, and 12 pairs of cranial nerves, which originate from the brainstem. In addition, the nervous system contains both the somatic system and the autonomic system, each with portions within the CNS and PNS.
The peripheral nervous system consists of cranial and spinal nerves that branch from the brain and spinal cord to all body parts. It is also subdivided into the somatic and autonomic systems. Cranial nerves. Twelve pairs of cranial nerves connect the brain to parts in the head, neck, and trunk.
The nervous system is the mechanism through which the organism is kept in touch with its internal structures and external environments and reacts to changes in them.
identify the principal components of the peripheral nervous system. explain the role of the peripheral nervous system in regulating the somatic (voluntary) and autonomic (involuntary) systems. compare the functions of the sympathetic division and the parasympathetic division of the autonomic nervous system.
What Is the Peripheral Nervous System? The peripheral nervous system (PNS) consists of all the nervous tissue that lies outside of the central nervous system (CNS). The main function of the PNS is to connect the CNS to the rest of the organism.
Peripheral Nervous System (PNS) - Rami. Each spinal nerve is quite short (1-2 cm) because almost immediately after emerging from the intervertebral foramen, it divides into a large anterior ramus and a smaller posterior ramus (pp. 75-76). Each ramus, like the spinal nerve itself is mixed.
Peripheral Nervous System (PNS) –Consists of 12 pairs of cranial nerves and 31 pairs of spinal nerves. –Serves as a critical link between the body and the central nervous system. –peripheral nerves contain an outermost layer of fibrous connective tissue called epineurium which surrounds a thinner layer of fibrous
