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The two additional cranial nerves present in mammals are :-
- a)Pharyngeal & vagus
- b)Spinal accessory and hypoglossal
- c)Trigeminal and glossopharyngeal
- d)Hypoglossal and sciatic
Correct answer is option 'B'. Can you explain this answer?
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The two additional cranial nerves present in mammals are :-a)Pharyngea...
The Two Additional Cranial Nerves Present in Mammals
The cranial nerves are a set of 12 pairs of nerves that originate from the brain and exit through small openings in the skull. They are responsible for carrying sensory, motor, and autonomic information to and from various parts of the body. In mammals, there are two additional cranial nerves apart from the standard twelve, which are the spinal accessory and hypoglossal nerves.
Spinal Accessory Nerve
The spinal accessory nerve, also known as the eleventh cranial nerve, originates from the spinal cord and exits through the skull. It is responsible for controlling the muscles of the neck and shoulder region, including the trapezius and sternocleidomastoid muscles. It also plays a role in controlling the muscles of the larynx and pharynx.
Hypoglossal Nerve
The hypoglossal nerve, also known as the twelfth cranial nerve, originates from the medulla oblongata and exits through the skull. It is responsible for controlling the muscles of the tongue, including movements such as swallowing, speech, and chewing.
Conclusion
In conclusion, the two additional cranial nerves present in mammals are the spinal accessory and hypoglossal nerves. The spinal accessory nerve controls the muscles of the neck and shoulder region, while the hypoglossal nerve controls the muscles of the tongue. These nerves play an essential role in the proper functioning of the body and any damage or dysfunction can lead to severe consequences.
The cranial nerves are a set of 12 pairs of nerves that originate from the brain and exit through small openings in the skull. They are responsible for carrying sensory, motor, and autonomic information to and from various parts of the body. In mammals, there are two additional cranial nerves apart from the standard twelve, which are the spinal accessory and hypoglossal nerves.
Spinal Accessory Nerve
The spinal accessory nerve, also known as the eleventh cranial nerve, originates from the spinal cord and exits through the skull. It is responsible for controlling the muscles of the neck and shoulder region, including the trapezius and sternocleidomastoid muscles. It also plays a role in controlling the muscles of the larynx and pharynx.
Hypoglossal Nerve
The hypoglossal nerve, also known as the twelfth cranial nerve, originates from the medulla oblongata and exits through the skull. It is responsible for controlling the muscles of the tongue, including movements such as swallowing, speech, and chewing.
Conclusion
In conclusion, the two additional cranial nerves present in mammals are the spinal accessory and hypoglossal nerves. The spinal accessory nerve controls the muscles of the neck and shoulder region, while the hypoglossal nerve controls the muscles of the tongue. These nerves play an essential role in the proper functioning of the body and any damage or dysfunction can lead to severe consequences.
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The two additional cranial nerves present in mammals are :-a)Pharyngeal vagusb)Spinal accessory and hypoglossalc)Trigeminal and glossopharyngeald)Hypoglossal and sciaticCorrect answer is option 'B'. Can you explain this answer?
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