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level: Level 1

Questions and Answers List

level questions: Level 1

Question	Answer
Superior oblique muscle runs forward between the roof and the medial wall of the orbital cavity and gives rise to a rounded tendon which then passes through________.	Trochlea
What is the primary action of superior rectus muscle?	Elevation
Lateral rectus muscle is innervated by the ________. a) Trochlear nerve b)Abducens nerve c)Oculomotor nerve	Abducens nerve
In dextroversion, which muscles are the yoked muscle?	Right lateral rectus muscle and left medial rectus muscle
Which extraocular muscle adduct the eye? a) Inferior rectus b) Inferior oblique c) Superior oblique d) Lateral rectus	Inferior rectus
Which muscles are involved?	Right inferior rectus muscle and left superior oblique muscle
Based on the picture shown above, which extraocular muscle is affected?	Right lateral rectus muscle
The origin of four rectus muscles	Annulus of Zinn
______ muscle elevates the upper eyelid. a) Superior rectus b) Superior oblique c) Levator palpebrae superioris	Levator palpebrae superioris
All six extraocular muscles attached to the iris. a)True b)False	False. All six extraocular muscles attached to the sclera
Oculomotor nerve (cranial nerve III) controls these muscles , EXCEPT : a) Medial rectus muscle b) Lateral rectus muscle c) Superior rectus muscle d) Inferior rectus muscle	Lateral rectus muscle
The extraocular muscle that origins from the lower limb of Annulus of Zinn	Inferior rectus
The inferior oblique muscle is the only muscle that originates from the anterior orbit. True False	True
The diagram above shows a patient with ptosis. Which extraocular muscle damage causes the ptosis observed above?	Paralysis of levator palpebrae superioris muscle. Ptosis can also cause by oculomotor nerve damage when there is a lesion found in cranial nerve III.
Both eyes move towards the left gaze is called _______.	Levoversion
Which nerve palsy will result in diplopia? a) Oculomotor nerve b) Trochlear nerve c) Abducens nerve	Trochlear nerve
When eye adducts, elevating and depressing ability of vertical rectus muscle increases. True False	False. When eye adducts, the vertical rectus muscle becomes perpendicular to the sagittal axis, then contraction of the superior or inferior rectus muscle will cause no vertical movement.
________ nerve enters the orbit through the superior orbital fissure.	Oculomotor nerve
Which muscle works with the superior rectus muscle to elevate the eye.	Inferior oblique
Superior rectus muscle inserts to the eye lobe superiorly in vertical meridian 7.7mm from limbus. True False	True
Ocular motility test is used to evaluate the extraocular muscles function. True False	True
what is the main arterial blood supply for the eye?	ophthalmic artery
Which structure is responsible for the pathway of the optic nerve and ophthalmic artery to enter and leave the orbit?	Optic canal
The bony orbit is made up of seven bones which are maxilla, zygomatic bone, frontal bone, ethmoid bone, lacrimal bone, sphenoid bone and palatine bone. True False	True
The bony orbit appears to be in ________ shape a) Square b) Pyramid c) Circle d) Star	Pyramid its base opening anteriorly onto the face, while the apex is pointed posteromedially
Which nerve is injured if a person looking inward towards their nose is unable to look down A) Abducen (CN VI) B) Inferior division of oculomotor (III) C) Optic (II) D) Trochlear (IV)	Trochlear (IV)
When the right medial rectus muscle contracts, which is the antagonist muscle ? a) Left medial rectus muscle b) Right lateral rectus muscle c) Left lateral rectus muscle d) Right superior rectus muscle	Right lateral rectus muscle
When the left lateral rectus muscle contracts, which is the synergist muscle? a) Left inferior oblique muscle b) Right inferior rectus muscle c) Left inferior rectus muscle d) Right medial rectus muscle	Left inferior oblique muscle
Which law states that whenever a nervous impulse initiates an eye movement in one eye, corresponding muscles in the other eye receives equal innervations to contract or relax.	Hering’s law of equal innervation
The function of optokinetic is to hold images of world steady on the retina with rapid,brief head rotations. True False	False. Optokinetic holds images of world steady on the retina during sustained rotations.