what are cranial nerve and spinal nerves how many pairs are there in peripherl nervous system?
Answers
Answer:
The peripheral nervous system has 12 pairs of cranial nerves that control much of the motor and sensory functions of the head and neck.
Answer:
The cranial nerves emerge from the central nervous system above the level of the first vertebrae of the vertebral column. Each cranial nerve is paired and is present on both sides. There are conventionally twelve pairs of cranial nerves, which are described with Roman numerals I–XII.
Explanation:
Cranial and spinal nerves are part of peripheral nervous system. The 12 pairs of cranial nerves are part of peripheral nervous system and are mostly concentred with head, neck and facial region of the body (vagus nerve X being the part of autonomous division serves as an exception). These are namely olfactory, optic, vestibulocochlear, vagus, oculomotor, trochlear, abducens, spinal accessory, trigeminal, facial, glossopharyngeal and hypoglossal nerves. Spinal nerves are attached to spinal cord. There are total 31 spinal nerves which are grouped as cervical (C1 to C8), thoracic (T1 to T12), lumber (L1 to L5), sacral (S1 to S5), and coccygeal nerves (C1).
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