6. Which of following structures is considered to be an accessory structure ofth
ID: 167909 • Letter: 6
Question
6. Which of following structures is considered to be an accessory structure ofthe e A. lens the B. retina. C. sclera. D. palpebrae E. cornea 7. The blink reflex is designed to A. maintain balance. B. regulate pupil size. C. provide clearer vision. D. keep the eyes moist. E. orient the eyes. 8. The lacrimal glands A. cause a sty when inflamed. B. constantly produce a fluid called tears. C. are located in the superomedial corner of the orbit. D. are innervated by parasympathetic fibers from the oculomotor nerve. E. produce sebum 9. The transparent anterior portion of the sclera is the A. iris. B. retina. C. cornea. D. choroid. E. pupil. 10. The contractile structure that surrounds the pupil is the A. iris. B. ciliary ring. C. sclera. D. ciliary muscle. E. retina.Explanation / Answer
6. D. Palpebrae.
Eyelids are also known as palpebrae.The five accessory structures of eye include eyelid, eyelashes, eyebrow,lacrimal apparatus and extrinsic eye muscles.
7.D. to keep the eyes moist
Blinking of the eye helps in lubrication of eye as well as for removal of irritants.
8. B.constantly produce a fluid called tears
Tears are produced by the lacrimal glands which is located near the outer edge of the eye.
9.C cornea.
Transparent anterior portion of sclera is cornea. It refracts the light entering the eye.
10.A.iris.
Iris is a contractile smooth muscle surrounding the pupil. It controls the pupil size.
11.c. fovea centralis.
Fovea centralis has the highest number of cones and is necessary for fine detailed vision.
12.D. canal of Schlemm
The sinus venosus sclerae is also known as canal of Schlemm. it is present at the sclerocorneal junction.
13.A. rods
Rhodopsin is a pigment found in rods and is required for vision in dim light.
14.E pupillary reflexes, variations in rod and cone function and changes in available rhodopsin.
15.A. is a function of cone cells.
Cones contain light sensitive pigments that help us in viewing colors.
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