Question

Purely motor nerve is
A. Optic
B. Abducens
C. Ophthalmic
D. Palatinus

Answer 1

The nerves are of two types; motor nerve and sensory nerve. The motor nerve involved in the movement and maintenance of muscles and the sensory nerve involves identifying senses like hearing, smelling, etc.

Complete step by step answer:
To solve this question, we have to know about cranial nerves. The cranial nerves are the pair of nerves that connect the brain and the other part of the head, trunk, and neck. There are twelve cranial nerves with different functions. Every nerve has a corresponding roman numeral from I to XII. The classification is based on the location from front to back. For example, our olfactory nerve is closer to the front part of the head; therefore, it is marked as I. The functions of this nerve are categorized either as motor or sensory. The sensory nerve involved in producing senses like smell, touch, and hearing and the motor nerve controls the function and the movement of glands or muscles.
The nerve I is the olfactory nerve as mentioned, the nerve II is the optic nerve that involves vision. When light enters inside the eye, the retina consists of receptors called rods and cones get activate and involve in night and colour vision. The nerve III is the oculomotor nerve that involve in the pupil response and the muscle function. The nerve IV is the trochlear nerve that controls the superior oblique muscle that is responsible for movement of inward, outward, and downward of the eye. The nerve V is the trigeminal nerve; it is the largest cranial nerve with both motor and sensory function. The VI is the abducens nerve that involve in the control of muscles that linked with the eye movement like lateral rectus muscle. The VII nerve is the facial nerve that involves controlling the facial muscles like expression, taste sense and movement of tongue etc. The VIII nerve is the vestibulocochlear nerve that involves the balance and hearing sensory functions. The IX nerve is the glossopharyngeal nerve that have both sensory and motor function that involves the sending of sensory signal from sinuses, taste for the back portion of our tongue etc, The X nerve is vagus nerve involve communicating sensory information from part of throat and ear canal. The XI nerve is the Accessory nerve that controls the neck muscles that allow it to rotate, extend, and flex of neck and shoulder. The XII nerve is the hypoglossal nerve, it involves for the movement of most of the muscles of our tongue. Therefore, purely the motor nerve is abducens nerve as the rest of the nerves have both sensory and motor function.
Thus, the correct option is ‘B’. Abducens.

Note: The greater palatine nerve supplies the gums, gland of the palate, the mucous membrane, and communication in the front part along with terminal filaments of the nasopalatine nerve.