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Anatomy Final > Orbit I > Flashcards

Orbit I Flashcards

1
Q

7 bones make up the orbit. Name the one not listed

A

Palatine

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2
Q

Identify “a” and “b”

A
  • a: superior orbital fissure
  • b: inferior orbital fissure
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3
Q

Identify “c”

A

optic canal

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4
Q

Identify green and yellow arrows

A

Green: Infraorbital foramen

Yellow: Supraorbital foramen

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5
Q

Identify blue arrow

A

nasolacrimal groove

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6
Q

Identify “a” and “b”

A
  • “a” Superior tarsal plate
  • “b” Inferior tarsal plate
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7
Q

Identify c

A

c: orbital septum

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8
Q

Identify arrow

A

medial and lateral palpebral ligaments

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9
Q

Identify arrows

A

green: superior tarsal plate
red: orbital septum

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10
Q

Identify the green box and green arrows

A
  • green box: Conjunctival sac
  • green arrow: Conjunctival fornices
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11
Q

Identify red and blue arrows

A

red: bulbar conjunctiva
blue: palpebral conjunctiva

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12
Q

Where is the lacrimal gland located

A

superolateral region of the orbit

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13
Q

List where the fluid from the lacrimal gland goes once it is in the eyeball

A
  • lacrimal puncta
  • lacrimal canaliculi
  • lacrimal sac
  • nasolacrimal duct
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14
Q

Parasympathetic innervation to the lacrimal gland is

  1. initiated at what cranial nerve?
  2. where does it synapse?
  3. How does the information from the ganglion get to the lacrimal gland: New pathway
A

CN VII -> Greater petrosal n. -> N. to pterygoid canal -> Pterygopalatine galgion (SYNAPSE) -> branches to lacrimal gland

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15
Q

Sympathetic innervation to lacrimal gland

A

follows parasympathetic innervation

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16
Q

Former pathway of parasympathetic innervation to lacrimal gland

A

CN VII -> Greater petrosal n. -> N. to pterygoid canal -> Pterygopalatine plexus (SYNAPSE) -> zygomatic branch of (CN V2) -> communicating branch of ophthalmic nerve (CN V1) -> Lacrimal nerve to gland

17
Q

identify purple and brown

A

purple: cornea

Brown: Sclera

18
Q

Identify blue and red

A

blue: choroid
red: retina

19
Q

identify orange

A

ciliary body

20
Q

Identify green and yellow

A

green: Fovea: strongest acuity
yellow: optic disc: blind spot

21
Q

What muscle is responsible for constricting the pupil? What innervation makes it contract?

A

Sphincter pupillae

  • parasympathetic
22
Q

What muscle dilates the pupil? What innervation makes muscle contract

A

Dilator pupillae

  • sympathetic innervation
23
Q

The cililary muscle contract under what innervation? What happens when it contracts?

A

paraympathetic

  • When muscle contracts; it moves toward the lens and the suspensory ligaments of the lens relax, causing the lens to change shape (more spherical) allowing lens to refract light for near vision
  • Accommodation: close focus
24
Q

List Pathway of light

A
  1. cornea
  2. iris -> pupil
  3. lens
  4. fovea centralis
  5. optical axis
25
Q

The medial aspect of the eye gains information from what field?

A

Lateral

26
Q

Damage to the left optic tract would present with what vision loss

A
27
Q

nerves of the orbit are supplied by what nerve

A

Ophthalmic nerve (CN V1)

28
Q

Name the termianl branches of the ophthalmic nerve (CN V1)

A
  • supraorbital
  • supratrochlear
  • Lacrimal
  • external nasal
  • Infratrochlear
29
Q

Branches of the opthalmic artery (branch of the internal carotid)

A
  • central artery of retina
  • lacrimal artery
  • ciliary arteries
  • supraorbital artery
  • ethmoidal arteries
  • dorsal nasal artery
30
Q

Venous drainage from eye leaves via what 2 main branches

A

superior ophthalmic vein

inferior ophthalmic vein

31
Q

Sympathetic innervation to eye

A

preganglionic axons travel sympathetic chain -> superior cervical ganglion (synapse) -> Postganglion axons follow arteries (internal carotid plexus) -> joing ciliary nerves entering eyeball

32
Q

Parasympathtics to eyeball

A

preganglionic axons begin on inferior division of oculomotor (CN III) -> Ciliary ganglion (synapse) -> Postganglionic axons hitchhike on the short ciliary branches of the ophthalmic (CN V1)

33
Q

pupillary light reflex

A

increase in light in one eye will result in pupillary constriction of both eyes

  • Sensory: CN II
  • Motor: CN III
34
Q

Accommodation reflex

A

focus on close objects (change in lens shape) causes pupillary contraction

  • Sensory: CN II
  • Motor CN III
35
Q

Corneal blink reflex

A

Contract with the cornea causes blinking

  • sensory: CN V1
  • Motor: CN VII
36
Q
A

Anatomy Final (14 decks)

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