Question

First cranial nerve supplies to
A. Nasal olfactory mucosa
B. Forearms
C. Lungs
D. Diaphragm

Answer 1

Hint: Cranial nerves are the pair of nerves that connect your brain to a different part of the body i.e. head, neck, and trunk. It acts as a pathway for the brain to send and receive impulses from the part of the body which is stimulated. There are twelve pairs that are enumerated on the basis of their locations from front to back.

Complete answer:
Option A- Nasal olfactory mucosa
Nasal olfactory mucosa is the moist epithelial lining of the nose and the function of the nasal mucosa is olfaction i.e. sense of smell. The olfactory bulb is an oval-shaped structure that contains a specialized group of nerve cells and receives nerve impulses from the mucosa. From the bulb, nerves connect to the olfactory tract and then pass into the brain.

Option B- Forearms
Forearms are supplied by five nerves: musculocutaneous, radial, median, ulnar, and medial antebrachial cutaneous nerve. The nerves in the forearms are derived from the branches of brachial plexus.

Option C- Lungs
The lungs are supplied by the nerves that are derived from pulmonary plexuses. The nerve fibers are connected to the vagus nerve which is the tenth cranial nerve.

Option D- Diaphragm
The nerve supplied to the diaphragm is the phrenic nerve. It is a mixed motor/sensory nerve which originates from spinal nerves in the neck.

Thus, the correct option is option A- Nasal olfactory mucosa.

Note: the olfactory nerve is closest to the front of the head, so it is designated as cranial nerve I. Each nerve has a corresponding roman numeral from I to XII.