Question

If a man abducens a nerve is injured. In that case, which one of the following functions will be affected?

a. Movement of the eyeball

b. Swallowing

c. Movement of the tongue

d. Movement of the neck

Answer 1

Various significant anatomical structures go through the crevice, and these can be harmed in orbital injury, especially victory cracks through the floor of the circle into the maxillary sinus. These structures are predominant and mediocre divisions of the oculomotor nerve (III); trochlear nerve (IV); lacrimal, frontal and nasociliary parts of ophthalmic (V1); abducens nerve (VI); prevalent and sub-par divisions of an ophthalmic vein; Inferior division likewise goes through the sub-par orbital crevice; thoughtful strands from enormous plexus.

Complete answer:

The abducens nerve (or abducens nerve) is the 6th cranial nerve (CNVI), in people, that controls the development of the sidelong rectus muscle, liable for outward look. It is a substantially different nerve. The abducens nerve supplies the sidelong rectus muscle of the natural eye. This muscle is answerable for outward gaze. The abducens nerve conveys axons of type GSE, general physical efferent.

Harm to the fringe part of the abducens nerve will cause twofold vision (diplopia), because of the unopposed muscle tone of the average rectus muscle. The influenced eye is pulled to look towards the midline. To see without twofold vision, patients will turn their heads so the two eyes are toward the sanctuary. Halfway harm to the abducens nerve causes feeble or deficient snatching of the influenced eye. The diplopia is more terrible on endeavours at looking along the side.

It innervates the horizontal rectus muscle of the eyeball. It is an engine nerve and controls the developments of the eyeball. Consequently, if the abducens nerve is harmed in a man, development of the eyeball will be influenced.

Hence, the correct answer is option (A).

Note: The abducens nerve controls the development of a solitary muscle, the horizontal rectus muscle of the eye. In most different warm-blooded animals, it likewise innervates the musculus retractor bulbi, which can withdraw the eye for security. Homologous abducens nerves are found in all vertebrates aside from lampreys and hagfishes.