Orbit and eye anatomy l General anatomy MCQs for dental student

Orbit & eye anatomy l General anatomy MCQs (multiple choice question) for dental student

MCQ on orbit and eye anatomy for human anatomy

1.        Following are the cutaneous branches of ophthalmic division of trigeminal nerve supplying the skin of face EXCEPT:

A.       Supraorbital

B.       Infraorbital

C.       Supratrochlear 

D.       Infratrochlear

2.        Lesions of abducent nerve cause paralysis of …………….of eyeball:

A.  Superior rectus     

B.  . Lateral rectus

C.  Inferior rectus      

D.  Superior oblique

3.        Following is true about superior oblique muscle of eyeball EXCEPT:

A.  The muscle arises from the body of sphenoid superomedial to the optic canal

B.  It is attached to sclera in front of equator of eyeball in its superolateral quadrant

C.  It causes depression and medial rotation movements of eyeball

D.  It is paralysed because of injury to trochlear nerve

4.         Following are branches of ophthalmic nerve EXCEPT:

A.    Frontal

B.     Lacrimal

C.     Nasociliary

D.    Zygomatic

5.         Intorsion of eyeball is caused by following group of muscles:

A.  Superior rectus + inferior rectus

B.   Superior oblique + inferior oblique

C.  Superior rectus + superior oblique

D.  Inferior rectus + inferior oblique

6.        Extorsion of eyeball is caused by following group of muscles:

A.    Superior rectus + inferior rectus

B.     Superior oblique + inferior oblique

C.     Inferior rectus + inferior oblique

D.    Superior rectus + superior oblique

7.  The only cranial nerve to emerge from dorsal side of the brain stem is the

a.    oculomotor

b.    facial

c.    trigeminal

d.   trochlear

e.    cerebral veins

8.  The superior orbital fissure

a.    lies directly inferior to the greater wing of the sphenoid

b.    lies directly above the posterior portion of the maxilla

c.    lies directly between the orbit and the infratemporal fossa

d.   transmits the III, IV, and VI cranial nerves

e.    transmits the maxillary nerve

 

9.  The optic canal transmits the

a.    optic n

b.    ophthalmic artery

c.    superior ophthalmic vein

d.   a and b only

e.    a, b, and c

10.       .If a person were unable to close the eyelids tightly dues to nerve damage, the damaged nerve(s) would be the

a.     sympathetic fibers on the ophthalmic artery

b.    superior division of the oculomotor

c.     inferior division of the oculomotor

d.    facial

e.     trigeminal

11.       The cell bodies of postganglionic parasympathetic axons supplying the lacrimal gland are in the

a.     geniculate ganglion

b.    pterygopalatine  ganglion

c.     otic  ganglion

d.    trigeminal  ganglion

e.     ciliary  ganglion

12.  If the patient can not keep his upper lid elevated due to paralysis of the smooth muscle that attaches to the superior tarsal plate?

a.    short ciliary nerves or the nerve to the inferior oblique muscle

b.    oculomotor nerve- specifically, the portion from Edinger-Westphal nucleus

c.    facial nerve

d.   trigeminal ganglion

e.    superior cervical sympathetic ganglion

13.  The muscle of the orbit that attaches to the eyeball and does not arise from the common tendinous ring is the

a.    inferior rectus

b.    superior rectus

c.    superior oblique

d.   medial rectus

e.    lateral rectus

14.  If the cornea is in an abducted position and the person then moves the cornea upwards (elevates), the muscle that would be the most effective for elevating the eyeball is the

a.    superior rectus

b.    superior oblique

c.    inferior rectus

d.   inferior oblique

e.    levator palpebrae superioris

15.  If all extraocular muscles were paralyzed except for the inferior oblique muscle, the cornea would be in this position

a.    adducted and elevated

b.    abducted and elevated

c.    adducted and depressed

d.   abducted and depressed

16.  The following nerves enter the orbit through the superior orbital fissure

a.    nasociliary, frontal and lacrimal branches of the trigeminal nerve

b.    abducens, oculomotor, and optic

c.    zygomatic and maxillary

d.   all the above

e.    both a and b, not c

17.  The skin on the medial part of the external nose is supplied mainly by the external nasal nerve which is a branch of the

a.    infratrochlear nerve

b.    infraorbital nerve

c.    supratrochlear nerve

d.   zygomaticofacial nerve

e.    anterior ethmoidal nerve

 

18.  The muscle(s) of the orbit that move(s) the eyeball so that the cornea is in a depressed position that is neither adducted nor abducted is (are)

a.    inferior rectus

b.    inferior oblique

c.    superior oblique

d.   inferior rectus and inferior oblique

e.    inferior rectus and superior oblique

 

19.  If a patient is asked to elevate his cornea when the eye is in an adducted position, he would use this muscle to perform the requested movement

a.    superior rectus

b.    inferior rectus

c.    levator palpebrae superioris

d.   inferior oblique

e.    superior oblique

20.  If a person has a drooping right eyelid and the superior division of the oculomotor nerve is normal, the person could have a lesion in the

a.     superior cervical sympathetic ganglion

b.    optic nerve

c.    abducent nerve

d.   trochlear nerve

e.    long and short ciliary nerves