Orbit I Flashcards Preview

Anatomy Final > Orbit I > Flashcards

Flashcards in Orbit I Deck (36):
1

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

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Palatine 

2

Identify "a" and "b"

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  • a: superior orbital fissure
  • b: inferior orbital fissure 

3

Identify "c"

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optic canal 

4

Identify green and yellow arrows

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Green: Infraorbital foramen

Yellow: Supraorbital foramen

5

Identify blue arrow

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nasolacrimal groove 

6

Identify "a" and "b"

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  • "a" Superior tarsal plate
  • "b" Inferior tarsal plate 

7

Identify c 

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c: orbital septum 

8

Identify arrow 

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medial and lateral palpebral ligaments 

9

Identify arrows

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green: superior tarsal plate

red: orbital septum 

10

Identify the green box and green arrows

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  • green box: Conjunctival sac
  • green arrow: Conjunctival fornices 

11

Identify red and blue arrows

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red: bulbar conjunctiva

blue: palpebral conjunctiva

12

Where is the lacrimal gland located

superolateral region of the orbit 

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13

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

  • lacrimal puncta
  • lacrimal canaliculi
  • lacrimal sac
  • nasolacrimal duct 

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14

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 

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

15

Sympathetic innervation to lacrimal gland

follows parasympathetic innervation 

16

Former pathway of parasympathetic innervation to lacrimal gland

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 

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17

identify purple and brown

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purple: cornea

Brown: Sclera 

18

Identify blue and red 

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blue: choroid

red: retina 

19

identify orange 

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ciliary body 

20

Identify green and yellow 

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green: Fovea: strongest acuity

yellow: optic disc: blind spot 

21

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

Sphincter pupillae 

  • parasympathetic 

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22

What muscle dilates the pupil? What innervation makes muscle contract 

Dilator pupillae

  • sympathetic innervation 

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23

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

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 

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24

List Pathway of light

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

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25

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

Lateral 

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26

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

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27

nerves of the orbit are supplied by what nerve

Ophthalmic nerve (CN V1) 

28

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

  • supraorbital
  • supratrochlear
  • Lacrimal
  • external nasal
  • Infratrochlear 

29

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

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

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30

Venous drainage from eye leaves via what 2 main branches 

superior ophthalmic vein

inferior ophthalmic vein 

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31

Sympathetic innervation to eye

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

32

Parasympathtics to eyeball

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

pupillary light reflex

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

  • Sensory: CN II
  • Motor: CN III

34

Accommodation reflex

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

  • Sensory: CN II
  • Motor CN III

35

Corneal blink reflex

Contract with the cornea causes blinking

  • sensory: CN V1
  • Motor: CN VII 

36