Explore Orbit & Extraocular Muscles eye anatomy mcq bank (Part 09) – 40 high-yield multiple-choice questions covering orbital foramina, muscle actions, nerve palsies, and clinical correlations. Ideal for NEET-PG, Optometry, Ophthalmology and Medical entrance exams. Strengthen your eye anatomy knowledge and master exam-oriented concepts with clear, structured MCQs. Test your understanding and keep learning with mcqzone is trusted partner in eye anatomy mcq bank. visit our Index Page to find ophthalmology mcq

Orbit – Foramina & Openings

41. Optic canal transmits:
A. Optic nerve + ophthalmic artery
B. Optic nerve + central retinal vein
C. Oculomotor nerve + ophthalmic artery
D. Trochlear nerve + ophthalmic vein

View Answer

A. Optic nerve + ophthalmic artery ✅ Exp: Only optic nerve & ophthalmic artery.

42. Superior orbital fissure lies between:
A. Greater & lesser wings of sphenoid
B. Frontal & maxilla
C. Zygomatic & sphenoid
D. Ethmoid & lacrimal

View Answer

A. Greater & lesser wings of sphenoid ✅ Exp: SOF between greater and lesser sphenoid.

43. Structures passing through superior orbital fissure include all EXCEPT:
A. Oculomotor nerve
B. Trochlear nerve
C. Maxillary nerve
D. Abducens nerve

View Answer

C. Maxillary nerve ✅ Exp: Maxillary nerve passes via foramen rotundum, not SOF.

44. Inferior orbital fissure connects orbit with:
A. Pterygopalatine & infratemporal fossae
B. Middle cranial fossa
C. Posterior cranial fossa
D. Anterior cranial fossa

View Answer

A. Pterygopalatine & infratemporal fossae ✅ Exp: IOF opens into pterygopalatine and infratemporal fossa.

45. Lacrimal fossa is located in:
A. Frontal bone
B. Maxilla
C. Lacrimal bone
D. Zygomatic

View Answer

A. Frontal bone ✅ Exp: Lacrimal gland lies in frontal bone fossa.

Extraocular Muscles – Advanced Actions

46. Pure depressor of eye in abducted position:
A. Superior rectus
B. Inferior rectus
C. Superior oblique
D. Inferior oblique

View Answer

B. Inferior rectus ✅ Exp: IR is pure depressor when eye abducted.

47. Pure depressor of eye in adducted position:
A. Inferior rectus
B. Superior oblique
C. Superior rectus
D. Inferior oblique

View Answer

B. Superior oblique ✅ Exp: SO depresses adducted eye.

48. Pure elevator of eye in abducted position:
A. Superior rectus
B. Inferior rectus
C. Inferior oblique
D. Superior oblique

View Answer

A. Superior rectus ✅ Exp: SR elevates abducted eye.

49. Pure elevator of eye in adducted position:
A. Superior rectus
B. Inferior oblique
C. Inferior rectus
D. Superior oblique

View Answer

B. Inferior oblique ✅ Exp: IO elevates adducted eye.

50. Which muscle causes abduction in adducted position?
A. Superior oblique
B. Inferior rectus
C. Inferior oblique
D. Superior rectus

View Answer

A. Superior oblique ✅ Exp: SO abducts adducted eye.

Levator Palpebrae & Eyelid Muscles

51. Levator palpebrae superioris inserts into:
A. Upper tarsal plate
B. Lower tarsal plate
C. Medial canthus
D. Orbital septum

View Answer

A. Upper tarsal plate ✅ Exp: Inserts into upper eyelid.

52. Accessory elevator of upper lid:
A. Muller’s muscle
B. Inferior rectus
C. Superior rectus
D. Orbicularis

View Answer

A. Muller’s muscle ✅ Exp: Sympathetic innervation.

53. Muller’s muscle innervation:
A. Parasympathetic
B. Sympathetic
C. Oculomotor
D. Trochlear

View Answer

B. Sympathetic ✅ Exp: Sympathetic supply from SCG.

54. Paralysis of levator palpebrae superioris →
A. Complete ptosis
B. Partial ptosis
C. Lid retraction
D. Diplopia

View Answer

A. Complete ptosis ✅ Exp: CN III palsy causes complete ptosis.

55. Paralysis of Muller’s muscle →
A. Partial ptosis
B. Complete ptosis
C. Lid lag
D. Blepharospasm

View Answer

A. Partial ptosis ✅ Exp: Sympathetic palsy = mild ptosis (Horner’s).

56. Oculomotor palsy features:
A. Ptosis, dilated pupil, eye down & out
B. Eye abducted only
C. Eye intorted
D. Lid lag only

View Answer

A. Ptosis, dilated pupil, eye down & out ✅ Exp: CN III palsy = “down and out” eye.

57. Trochlear palsy hallmark:
A. Vertical diplopia
B. Horizontal diplopia
C. Convergent strabismus
D. Ptosis

View Answer

A. Vertical diplopia ✅ Exp: SO palsy → vertical diplopia.

58. Abducens palsy hallmark:
A. Esotropia
B. Exotropia
C. Hypertropia
D. Hypotropia

View Answer

A. Esotropia ✅ Exp: LR palsy → medial deviation.

59. Which nerve palsy worsens on looking down stairs?
A. Oculomotor
B. Trochlear
C. Abducens
D. Trigeminal

View Answer

B. Trochlear ✅ Exp: SO palsy → difficulty in downgaze.

60. Isolated pupil involvement is most typical of:
A. Oculomotor nerve palsy
B. Trochlear palsy
C. Abducens palsy
D. Horner’s syndrome

View Answer

A. Oculomotor nerve palsy ✅ Exp: CN III palsy → dilated fixed pupil.

61. To test superior rectus, ask patient to look:
A. Laterally then up
B. Medially then up
C. Straight up
D. Downward

View Answer

A. Laterally then up ✅ Exp: SR tested in abduction.

62. To test inferior rectus, ask patient to look:
A. Laterally then down
B. Medially then down
C. Straight down
D. Upward

View Answer

A. Laterally then down ✅ Exp: IR tested in abduction.

63. To test superior oblique, ask patient to look:
A. Medially then down
B. Laterally then down
C. Straight down
D. Medially then up

View Answer

A. Medially then down ✅ Exp: SO tested in adduction.

64. To test inferior oblique, ask patient to look:
A. Medially then up
B. Laterally then up
C. Straight up
D. Downward

View Answer

A. Medially then up ✅ Exp: IO tested in adduction.

65. Cover test is used for detecting:
A. Latent strabismus (heterophoria)
B. Manifest strabismus
C. Diplopia
D. Ptosis

View Answer

A. Latent strabismus (heterophoria) ✅ Exp: Cover test picks up phorias.

66. Commonest orbital wall fracture:
A. Floor (blow-out fracture)
B. Roof
C. Lateral
D. Medial

View Answer

A. Floor (blow-out fracture) ✅ Exp: Floor thin → blow-out in trauma.

67. In blow-out fracture, which muscle is entrapped?
A. Inferior rectus
B. Superior rectus
C. Lateral rectus
D. Superior oblique

View Answer

A. Inferior rectus ✅ Exp: IR trapped in floor fracture.

68. Orbital cellulitis most dangerous complication:
A. Ptosis
B. Cavernous sinus thrombosis
C. Conjunctivitis
D. Blepharitis

View Answer

B. Cavernous sinus thrombosis ✅ Exp: Via ophthalmic vein spread.

69. Proptosis refers to:
A. Forward displacement of eyeball
B. Backward displacement
C. Medial displacement
D. Downward displacement

View Answer

A. Forward displacement of eyeball ✅

70. Exophthalmometer measures:
A. Degree of proptosis
B. Visual acuity
C. Intraocular pressure
D. Pupillary reflex

View Answer

A. Degree of proptosis ✅ Exp: Hertel’s exophthalmometer.

71. Whitnall’s ligament supports:
A. Levator palpebrae superioris
B. Superior rectus
C. Inferior rectus
D. Lateral rectus

View Answer

A. Levator palpebrae superioris ✅

72. Check ligament of medial rectus attached to:
A. Lacrimal crest
B. Zygomatic bone
C. Frontal bone
D. Maxilla

View Answer

A. Lacrimal crest ✅ Exp: Restricts excessive abduction.

73. Check ligament of lateral rectus attached to:
A. Zygomatic bone
B. Lacrimal crest
C. Maxilla
D. Frontal

View Answer

A. Zygomatic bone ✅ Exp: Restricts excessive adduction.

74. Lockwood’s ligament suspends:
A. Globe (inferior suspensory ligament)
B. Levator muscle
C. Superior rectus
D. Lateral rectus

View Answer

A. Globe (inferior suspensory ligament) ✅ Exp: Lockwood’s ligament suspends globe.

75. Annulus of Zinn surrounds:
A. Optic canal
B. Inferior orbital fissure
C. Supraorbital notch
D. Lacrimal fossa

View Answer

A. Optic canal ✅ Exp: Common origin of recti muscles.

76. Orbital septum functions to:
A. Prevent orbital fat prolapse
B. Assist ocular motility
C. Maintain corneal transparency
D. Anchor lens

View Answer

A. Prevent orbital fat prolapse ✅ Exp: Fibrous sheet prevents fat prolapse.

77. Main stabilizers of globe in orbit:
A. Tenon’s capsule + check ligaments
B. Recti muscles only
C. Oblique muscles
D. Orbital septum

View Answer

A. Tenon’s capsule + check ligaments ✅ Exp: Suspensory system maintains position.

78. Orbital axis vs visual axis:
A. Same direction
B. Differ by 23°
C. Differ by 45°
D. Parallel

View Answer

B. Differ by 23° ✅ Exp: Orbital axis diverges 23° from visual axis.

79. Angle between medial walls of two orbits:
A. 30°
B. 45°
C. 60°
D. 75°

View Answer

B. 45° ✅ Exp: Medial walls parallel, lateral walls diverge ~45°.

80. Angle between lateral walls of two orbits:
A. 30°
B. 45°
C. 90°
D. 120°

View Answer

C. 90° ✅ Exp: Two lateral walls form ~90° angle.

This completes Orbit & Extraocular Muscles – eye anatomy mcq bank (Part 09), covering important topics like orbital foramina, extraocular muscle actions, nerve palsies, and applied anatomy. These MCQs are carefully curated to strengthen your conceptual understanding and enhance exam readiness for NEET-PG, Optometry, and Ophthalmology exams.