distinguish between spinal nerve and cranial nerve 7 points
Answers
☆ spinal nerve...
● spinal nerve is a mixed nerve.
● they carry moter and sensory neurons .
● in human body 31 pair of spinal nerves are present .
● spinal nerve is a part of peripheral nervous system.
● they carry signal between spinal cord and the body.
● it is also called " mixed nerves " .
☆ Cranial nerve...
● they pass through the skull base to the brain.
● they emerge directly from the brain.
● each cranial nerve is paired and present on both side.
● the 12 cranial nerve can be divided into sensory, moter and mixed neurons.
● their name are generally formed according to their structure.
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Answer:
CRANIAL NERVES
⦿ There are 12 pairs of Cranial Nerves in the human body.
⦿ Some of the cranial nerves are sensory, some are motor nerves and very few are mixed nerves.
⦿ Branches of these nerves connect to the retina, ear, nose, tongue, eye, muscles, neck, face and pharynx.
⦿ Of the total 12 pairs of cranial nerves in the human body, Vagus (the 10th Cranial Nerve) is more important.
⦿ 10th Cranial Nerve, Vagus controls the rate of heartbeat and secretions of the pancreas.
⦿ Vagus Nerve is a mixed nerve in the human body.
EXAMPLES
1. Cranial Nerve-II or Optic Nerve
2. Cranial Nerve-III or Oculomotor Nerve
SPINAL NERVES
⦿ There are 31 pairs of Spinal Nerves in the human body.
⦿ All the spinal nerves are mixed nerves because they have both sensory and motor fibres.
⦿ The sensory nerves originate from the Dorsal Horn of the spinal cord and they carry information from organs to the spinal cord.
⦿ The motor fibres originate from the Ventral Horns of the spinal cord and supply information required for the movement of the muscles.
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