Extraocular Muscles

What is required for normal visual perception?

• Use of corrective lenses

• Digital enhancement of images

• High levels of light

• Proper functioning of ocular motor systems

Which muscles work together to control horizontal eye movements?

• Superior and inferior rectus

• Medial rectus and lateral rectus

• Superior and inferior oblique

• Inferior rectus and superior oblique

Which cranial nerve controls the lateral rectus of the ipsilateral eye?

• Facial (VII cranial) nerve

• Trochlear (IV cranial) nerve

• Abducens (VI cranial) nerve

• Oculomotor (III cranial) nerve

What is the function of the vestibulo-ocular reflex?

• Gaze shifting

• Gaze stabilization during rapid head movement

• Adjusting for different viewing distances

• Following a moving visual target

Which system predominates in producing eye movements that track moving visual targets in humans?

• Saccade system

• Optokinetic system

• Vestibulo-ocular system

• Smooth pursuit system

What results from damage to the oculomotor nerve?

• Inability to elevate or adduct the eye ipsilateral to the damage

• Loss of vision in the affected eye

• Permanent closure of the eyelid

• Loss of color vision

What is the effect of damage to the abducens nerve?

• Enhanced visual acuity

• Inability to abduct the eye

• Total blindness

• Uncontrolled eye rotation

What is the primary function of smooth pursuit eye movements?

• To stabilize gaze during head movements

• To initiate rapid eye movements towards a visual target

• To follow a moving visual target

• To adjust the focus of the lens

The extraocular muscles are attached to the ________ of the eye at one end and are anchored to the bony orbit of the eye at their opposite ends.

• sclera

• cornea

• Pupil

• iris

What is the function of the superior rectus muscle?