BRAIN
CRANIAL NERVES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Sulcus preolivarius
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Postolivary sulcus
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Pontocerebellar angle
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Lateral bridge groove
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Fossa interpeduncularis
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Detailed explanation-1: -The hypoglossal nucleus is on the floor of the fourth ventricle and contains the motor neurons that innervate the tongue. The nucleus is elongated, and multiple rootlets exit along a line between the pyramid and olive of the medulla.
Detailed explanation-2: -Hypoglossal canal: This hole is the one closest to the foramen magnum. It allows passage of the twelfth cranial nerve (CNXII), the hypoglossal nerve.
Detailed explanation-3: -These nerves originate in the motor nuclei of the medulla, passing through the hypoglossal canals of the occipital bone, to reach the tongue muscles. Each hypoglossal nerve exits the cranium and curves, reaching the skeletal tongue muscles. It provides voluntary motor control of tongue movements.