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Head And Neck ~ Anatomy > Orbit, Extraocular Muscles And CN 3 4 6 > Flashcards

Orbit, Extraocular Muscles And CN 3 4 6 Flashcards

1
Q

Thinnest wall of Orbit

A

Medial Wall

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2
Q

Medial wall of the orbit is formed by

A

u

S ~ body of Sphenoid

M ~ Maxilla

L ~ Lacrimal

E ~ Ethmoid

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3
Q

Fracture is seen in the which wall of the orbit

A

Floor of the Orbit

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4
Q

Lateral wall of Orbit Formed by

A

Zygomatic Bone

Greater Wing of Sphenoid

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5
Q

Roof of the orbit is formed by

A

Frontal Bone

Lesser wing of Sphenoid

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6
Q

Floor of the Orbit is Formed by

A

Maxilla Bone

Zygomatic Bone

Palatine Bone

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7
Q

Optic Canal Transmit and Present in Which Bonw

A

In the Lesser Wing of Sphenoid

Ophthalmic Artery

Optic nerve with Meninges

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8
Q

Superior Orbital Fissure Is divided into

A

Superolateral Part

Intermediate Part

Inferomedial Part

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9
Q

Structures Passing Through Superolateral Compartment of Superior Orbital Fissure

A

L ~ Lacrimal nerve

F ~ Frontal nerve

T ~ Trochlear nerve

Superior Ophthalmic Vein

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10
Q

Structures Passing Through Intermediate Compartment of Superior Orbital Fissure

A

SO ~ Superior division of Oculomotor nerve

N ~ Nasociliary nerve

I ~ Inferior division of oculomotor nerve

A ~ Abducent nerve

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11
Q

Structures passing through Inferomedial Compartment of Superior Orbital Fissure

A

Inferior Ophthalmic Vein

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12
Q

Inferior Orbital Fissure transmitting

A

Infraorbital Nerve (continuation of Maxillary Nerve)

Zygomatic Branch (of Maxillary Nerve)

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13
Q

Recti ~ means

A

Straight

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14
Q

Origin of 4 Rectus Muscles

A

Common Tendinous Ring

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15
Q

Origin of Inferior Oblique Muscle

A

Floor of The Orbit (Maxilla Bone)

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16
Q

Angle of Superior Rectus and Medial Rectus on which side to Visual Axis

A

Lateral to Visual Axis

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17
Q

Main Action of Superior Rectus Muscle

A

Elevation on abducted eye

Other Actions;
Adduction

Intorsion

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18
Q

Main action of Inferior Rectus Muscle

A

Depression on abducted eye

Other Actions;
Adduction

Extortion

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19
Q

Intorsion of the eye ball refers to

A

Inward movement of the eyeward

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20
Q

Intorsion is done by ____________ muscles

Extorsion done by __________
muscles

A

Superior muscles ~ intorsion

Inferior muscles ~ extorsion

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21
Q

Superior and Inferior Oblique Muscles are attached behind the _____________

A

Equator of eye ball

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22
Q

Angle of Superior and Inferior oblique is on which side of the Visual Axis

A

Medial to Visual Axis

23
Q

Main Action of Superior Oblique Muscle is

And other actions

A

Depression on adducted eye

Other Actions;
Abduction

Intorsion

24
Q

Main Action of Inferior oblique muscle

And other actions

A

Elevation on adducted eye

Other Actions;
Abduction

Extorsion

25
Q

Elevation on Abducted Eye is done by __________ Muscle

A

Superior Rectus Muscle

26
Q

Elevation on Adducted Eye is done by __________ Muscle

A

Inferior Oblique Muscle

27
Q

Depression on abducted eye is done by ___________ Muscle

A

Inferior Rectus Muscle

28
Q

Depression of adducted eye is done by _________ Muscle

A

Superior Oblique Muscle

29
Q

Adduction is done by

Main Muscle -

Other Muscle -

A

Main Muscle - Medial Rectus

Other Muscle - Superior and Inferior Rectus

30
Q

Abduction is done by

Main Muscle -

Other Muscle -

A

Main Muscle - Lateral Rectus

Other Muscle - Superior and Inferior Obliue

31
Q

Nerve Supply To Extra Ocular Muscles ~ mnemonic

A

SO4 LR6 Remaining3

32
Q

Functional columns of 3rd nerve

A

GSE - to supply Extraocular Muscle

GVE - to supply Sphincter Pupillae and Ciliaris Muscle

Parasympathetic column from Edinger Westfall Nucles

33
Q

3rd and 4th Nerve is passing b/w _________ Arteries

A

Posterior Cerebral Artery
and
Superior Cerebellar Artery

34
Q

Before entering the Orbital Cavity 3rd Nerve is divided into

A

Superior and Inferior Division

Then both enters through superior orbital fissure in the common Tendinous ring

35
Q

Superior Division of Oculomotor nerve is supplying

A

Levator Palpebrae Superioris

Superior Rectus Muscle

36
Q

Medial Rectus
Inferior Rectus
Inferior Oblique

Muscles supplied by

A

Inferior division on Oculomotor nerve

37
Q

GVE ~ Parasympathetic Component of Oculomotor Nerve reach Ciliary Ganglion via

A

Nerve To Inferior Oblique

38
Q

Parasympathetic Fibres from Ciliary Ganglion via ___________ Nerve, Supplies _______ and ________ Muscle

A

Via Short Ciliary Nerves

Ciliaris Muscle (95% fibres)

and

Sphincter Pupillae (5%)

39
Q

Oculomotor Nucleus is located in the Midbrain at the level of

A

Superior Colliculus

40
Q

Fibres Supplying the ___________ Muscle,

is crossing to the opposite side within the nucleus and joins with the oculomotor Nerve

A

Fibres coming to Superior Rectus Muscle

41
Q

Lesion to the Right Oculomotor Nucleus

Which side of the Superior Rectus Muscle will be affected?

A

Both side Superior Rectus Muscles will be affected

Lesion in one nucleus will affect crossing of opposite side fibres too

42
Q

Changes In Accommodation Reflex

A
  1. Medial Convergence of eyeball ~ by medial Rectus
  2. Construction of Pupil ~ Sphincter Pupillae
  3. Increase in Thickness of Lens ~ Ciliary Muscle
43
Q

The sole Property of 3rd Cranial Nerve

A

Accommodation Reflex

44
Q

Features of 3rd Nerve Palsy

P

P D

p D O

Reflexes ~

A

P ~ Ptosis (LPS)

P D ~ Pupils Dilated

p D O ~ Down d/t Superior Oblique

          Out d/t Lateral Rectus

Loss of Light Reflex

Loss of Accommodation

45
Q

Cranial Nerve with

Dorsal Exit

Internal Decussation ~ Supply contralateral side

Longest IntraCranial Course

Slender/Smallest Nerve

A

Trochlear Nerve

46
Q

Exit of Trochlear Nerve from the midbrain at the level of

A

Inferior Colliculus

47
Q

Nerves Passing between Superior Cerebellar Artery and Posterior Cerebral Artery

A

3rd and 4th Cranial Nerves

48
Q

Features of 4th Nerve Injury

A

Loss of Intorsion

Extorted Eye Ball

To correct extorsion Head Tilt ~ to Opposite side

49
Q

Location of Abducens Nucleus

A

Lying under Facial Colliculus

50
Q

Nerve with longest Intradural course

A

Abducens Nerve

51
Q

Dorello’s Canal is situated Between

And is formed by

A

Between Apex of the
Petrous Temporal Bone and Clivus

Formed by Petrosphenoid Ligament

52
Q

Under Raised Intracranial Pressure the Abducent Nerve is irritated by

A

Apex of the Petrous-Temporal Bone

53
Q

Most Common Nerve to get affected in the Raised Intracranial Pressure

A

6th Cranial Nerve

54
Q

Nerve passing through (space) the cavernous sinus

A

6th Cranial Nerve

Head And Neck ~ Anatomy (16 decks)

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