Question

Trochlear, trigeminal and glossopharyngeal nerves are respectively
A. IX, V and IV
B. V and IX
C. V, IV and IX
D. IV, V and IX

Answer 1

There are 12 cranial nerves. These twelve pairs of nerves arise directly from the brain, not from the spinal cord, and pass through separate apertures in the skull.

Complete answer: There are 12 pairs of cranial nerves that present at the ventral surface of the brain. They are connected with the internal organs and regulate their functions. Trochlear is the IVth cranial nerve that regulates eye movement. Trigeminal is the Vth cranial nerve that carries the somatosensory information from the face and head to the brain and even regulates the chewing muscle movement. Glossopharyngeal is IX cranial nerve that carries somatosensory information from tongue, pharynx, tonsils to the brain and even regulates the muscles used in swallowing. The trochlear nerve provides motor supply to the superior oblique muscle of the eye, The trochlear nerve carries axons of type general somatic efferent(GSE), which innervate skeletal muscle of the superior oblique muscle. The trigeminal nerve (the fifth cranial nerve) is a nerve responsible for the sensations in the face and motor functions such as biting and chewing; it is the most complex of the cranial nerves. Containing both sensory and motor components, the glossopharyngeal nerve provides somatic motor innervation to the stylopharyngeus muscle, visceral motor innervation to the parotid gland, and carries afferent sensory fibers from the posterior third of the tongue, pharynx, and tympanic cavity.
Thus, the correct answer is option D

Note: Cranial nerves are nerves that come from our brain or the brain stem. This is opposite to the spinal nerves, which come from parts of the spinal cord. Cranial nerves transmit information between the brain and parts of the human body, especially to and from the head and the neck area. appear or originate from the brain.