The IV cranial nerve is
- oculomotor
- trochlear
- olfactory
- facial
The Correct Option is B
Solution and Explanation
The nerves which originate mostly from the brain and emerge through the cranium are known as cranial nerves. There are present \(12\) pairs of cranial nerve in man. Trochlear nerve is IV cranial nerve. This nerve name means Pulley because it innervates an extrinsic eye muscle that loops a pulley-shaped ligament in the orbit. It originates from the floor of the midbrain. It is motor nerve, helps in controlling the movement of the eye-ball. Olfactory nerve is I cranial nerve which arises in the olfactory epithelium of the nasal chamber. It enters the olfactory bulb of olfactory lobes of the brain. It is sensory nerve which carries impulses of smell from olfactory epithelium to the brain. Oculomotor nerve is III cranial nerve. It is motor nerve and carries impulses from the brain to those muscles controlling the movements of eye-ball. Facial nerve is a VII cranial nerve. It conveys impulses from the taste buds. It also controls the facial expression.
So, the correct answer is (B): trochlear
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Concepts Used:
Neural Control and Coordination
Neural System:
Neurons are the most specialised cells in the nervous system of all animals, and they are responsible for detecting, accepting, and conveying numerous types of motives. The neurological system of low-spinal animals like Hydra is incredibly simple, consisting of a network of neurons. When the brain of an insect comprises a vast number of ganglia and neural tissues, it is optimally structured.
Coordination System:
Coordination is the process by which two or more organs work together to accomplish each other's duties. Increased muscle activity increases the supply of oxygen and the demand for energy while we exercise. When we cease exercising, our nerves, heart, lungs, and kidneys all return to normal. As a result, all of the organs' functions are properly integrated in order to conduct the exercise and supply the appropriate conditions while exercising. Similarly, in the human body, the neurological and endocrine systems work together to coordinate all of the organ activities.
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