Question

Eye muscles are attached to
A. Sclerotic
B. Cornea
C. Choroid
D. Retina

Answer 1

Hint: Eyes move with the help of six muscles. The retina, a specialized type of tissue containing photoreceptors, senses light. These specialized cells convert light into electrochemical signals. Signals are travelled along the optic nerve fibres to the brain, where there will be interrupted vision in the visual cortex.

Complete answer: The eye movement is facilitated by six extraocular muscles. These types of muscles are raised from the common tendinous ring in the orbit and the eye cavity that is attached to eyeballs. The six muscles are inferior, lateral, medial, and superior rectus muscles, the superior and inferior muscles. There will be a contraction of muscles during the eyeball movement, by pulling the eyeball towards the muscle. When it contracts, the eyeball moves so that the pupil looks outwards. The medial rectus makes the eyeball to look inwards when functional; the inferior rectus downwards and the superior rectus upwards respectively. Eye muscles or the extraocular muscles are attached to the sclera i.e. the external layer of the eye. These muscles are responsible for the movement of the eye along three different axes: horizontal, either toward the nose (adduction) or away from the nose (abduction); vertical, either elevation or depression; and torsional, movements that bring the top of the eye toward the nose (intorsion) or away from the nose (extorsion).
Hence, the correct answer is option A.

Note: The horizontal movement is controlled entirely by the medial and lateral rectus muscles; the medial rectus muscle is responsible for adduction, the lateral rectus muscle for abduction. Coordinated action is required for the vertical movement of the superior and inferior rectus muscles, as well as the oblique muscles in the eye whenever required.