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Anatomy II > Lecture 26: Eye and Orbit II > Flashcards

Lecture 26: Eye and Orbit II Flashcards

1
Q

5 cranial nerves in orbit

A

CN II, III, IV, V1, VI

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2
Q

Optic nerve enters orbit via

A

Optic canal

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3
Q

3 structures that pass through optic canal

A

Optic nerve
Internal ophthalmic artery
Internal ophthalmic vein

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4
Q

Which muscle pulls the eye back into the orbit

A

Retractor bulbi

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5
Q

7 extrinsic eye muscles

A

Dorsal, ventral, medial and lateral recti
Dorsal and ventral obliques
Retractor bulbs

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6
Q

Parasympathetic branch of CN III

A

Short ciliary nerves

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7
Q

Long ciliary nerve innervation

A

Sensory from cornea and sclera

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8
Q

anterior and posterior ethmoidal nerves

A

Sensory from naval cavity

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9
Q

Short ciliary nerves innervation

A

Parasympathetic to pupillary sphincter and ciliary muscle

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10
Q

Pathway of CN III innervating ciliary ganglion

A

Preganglionic parasympathetic cell bodies in Edinburg Westphal nucleus (midbrain) —> CN III —> synapse at ciliary ganglion —> hitchhike on short ciliary nerves —> innervate pupillary sphincter and ciliary muscle

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11
Q

Function of lateral rectus

A

Cornea looks laterally
Rotation laterally/abduction

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12
Q

Which muscle causes nictitating membrane/3rd eyelid to partially cover eye

A

Retractor bulbs

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13
Q

3 sensory branches of V1/ophthalmic nerve

A

Lacrimal
Frontal
Nasociliary

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14
Q

Nasocilary nerve (from C1): innervation

A

Sensory from nasal cavity, cornea, sclera

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15
Q

Frontal nerve (from V1) innervation

A

Sensory from skin of forehead and scalp

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16
Q

Lacrimal nerve (from V1) innervation

A

Sensory from lacrimal gland, conjunctiva and upper eyelid

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17
Q

2 branches of nasociliary (from from V1)

A

Long ciliary nerves
Anterior and posterior ethmoidal nerves

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18
Q

Which nerve branch from V1 nasociliary gets sensory from cornea and sclera

A

Long ciliary nerves

19
Q

Which branch of nasociliary from V1 gets sensory from nasal cavity

A

Anterior and posterior ethmoidal nerves

20
Q

Which branch of oculomotor gets parasympathetic to pupillary sphincter and ciliary muscle

A

Short ciliary nerves

21
Q

Lacrimal gland innervation

A

Sensory from lacrimal nerve
Parasympathetic from pterygopalatine ganglion (CN VII)

22
Q

Sympathetic pathway to eye and head (3 features)

A

Site of synapse = cranial cervical ganglion
Internal carotid periarterial plexus = postganglionic sympathetics to dilator papillae and superior tarsal muscles
External carotid periarterial plexus = postganglionic sympathetics to face

23
Q

Visual pathway

A

Photoreceptors —> bipolar neurons —> retinal ganglion nucleus —> lateral geniculate nucleus of thalamus —> primary visual cortex/occipital lobe

24
Q

Where do 1/2 of optic axons cross the midline and are delivered to opposite side

A

Optic chiasm

25
Q

2 main visual fields in retina

A

Temporal
Nasal

26
Q

Nasal vs temporal part of retinas: what happens to info

A

Nasal crosses to OTHER SIDE
Temporal stay on same side

27
Q

What kind of info do optic tracts contain

A

Mixed info
1/2 from each side (due to nasal crossing in the middle)

28
Q

Direct light reflex

A

Pupil constricts in eye stimulated by light

29
Q

consensual light reflex: definition, importance

A

Pupil constricts in Contralateral eye
(Even though light not shined in that eye)
Demonstrates crossing of info at chias

30
Q

Edinger westphal nuclei and pretectal area are part of what brain region

31
Q

Primary visual cortex located in what lobe

32
Q

Pupillary light reflex pathway

A

Optic nerve fibers synapse at pretectal areas —> pretectal nerve fibers synapse bilaterally at edinger westphal nuclei —> EW nerve fibers (preganglionic parasympathetic) synapse at ciliary ganglia —> postganglionic parasympathetic fibers in ciliary ganglia synapse on pupillary sphincter muscle and cause it to contract

33
Q

Pupillary dilation reflex process

A

Preganglionic sympathetic nerve fibers synapse in superior portion of sympathetic trunk —> postganglionics synapse on pupillary dilator muscle

34
Q

Short ciliary arteries are Anastamoses between

A

External and internal carotid arteries

35
Q

Main blood supply to orbital contents

A

Short ciliary arteries

36
Q

Internal ophthalmic artery goes through what hole

A

Optic canal

37
Q

Venous drainage of orbital contents

A

Brain —> cavernous sinus—> vertebral and internal jugular veins

38
Q

what nerve innervates retractor bulbs

39
Q

Medial rectus vs lateral rectus function

A

Medial - adduct eye
Lateral - abduct eye

40
Q

Dorsal vs ventral rectus function

A

Dorsal - adduct and elevate eye
Ventral - adduct and depress eye

41
Q

Ventral vs dorsal oblique function

A

Ventral - abduct and elevate eye
Dorsal - abduct and depress eye

42
Q

2 muscles that accomplish looking up

A

Dorsal rectus
Ventral oblique

43
Q

2 muscles that accomplish looking down

A

Ventral rectus
Dorsal oblique

Anatomy II (36 decks)

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