Question

17. The optic nerves cross at a region in the brain called the a. Anterior commissure. 20. Eye movement is determined by the b. Optic chiasm. c. Visual cortex. a. The oculomotor nerves (III). d. Optic tracts. b. The oculomotor (III), facial (V) and abducens nerves (VI). c. The oculomotor (III), trochlear (IV) and abducens (VI) nerves. d. The optic (II), oculomotor (111), trochlear (IV) and abducens (VI) nerves. ***The selected ANSWERS are INCORRECT*****

Answer 1

20. Oculomotor nerves III,trochlear (IV) and abducens VI nerve.

Oculomotor nerve III helps in the movement of eye muscle to move the eyeball and upper eyelid.The optic II nerves is involved in vision formation by transmitting signal to the brain.The trochlear nerves helps in movement of superior oblique muscles to move downward and inward. The abducens nerves helps in movement of lateral rectus muscles which allows the eye to gaze on some object.The facial nerves is involved in facial expression,taste and ear sensation.

17.b.optic chiasm.

Anterior commissure connects the olfactory bulb and region of cerebreum.The optic chiasm is the point where two optic nerve cross-over and enters into lateral geniculate body through optical tract followed by visual cortex for vision formation.