Orbit and Extraocular Muscle Testing Pt. 2 Flashcards Preview

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Flashcards in Orbit and Extraocular Muscle Testing Pt. 2 Deck (39):
1

What are the 5 structures in the orbit that receive autonomic innervation?

1.) Dilator pupillae muscle
2.) Constrictor pupillae muscle
3.) Ciliary Muscle
4.) Levator palpebrae (smooth muscle part)
5.) Lacrimal gland

2

Of these 5, which two only get SYMPATHETIC innervation?

Dilator pupillae and levator palpebrae

3

Of these 5, which two receive only PARASYMPATHETIC innervation?

constrictor pupillae and ciliary

4

OF these 5, which is the only one to receive BOTH sympathetic and parasympathetic innervation

Lacrimal gland

5

The sympathetic innervation of the dilator pupillae and levator palpebrae is via postganglionic fibers whose cell bodies are in the

Superior cervical ganglion

6

The preganglionic sympathetic fibers arrise from

T1

7

The parasympathetic innervation to the lacrimal gland is via the

Greater petrosal branch of CN VII (preganglionic) and the pterygopalatine ganglion (post ganglionic)

8

The parasympathetic innervation to the constrictor pupillae and ciliary muscles is via

CN III (preganglionic) and ciliary ganglion (post ganglionic)

9

The ciliary ganglion contains cell bodies of

Post ganglionic parasympathetic neurons

10

Preganglionic parasympathetic axons from CN III enter the ciliary ganglion through the

Motor root

11

The post ganglionic axons then leave the ciliary ganglion through the short ciliary nerves and to the eyeball to innervate the

Sphincter pupillae and cilliary muscles

12

Contains sensory fibers from CN V1 and postganglionic sumpathetic axons from cell bodies in the superior cervical ganglion that pass through wihtout synapsing

Ciliary ganglion

13

What is the sensory nerve in the orbit for special sensation?

Optic nerve (II)

14

What is the sensory nerve in the orbit for general sensation?

Opthalmic (V1) and maxillary (V2) divisions of the trigeminal nerve

15

The eyeball receives general sensory innervation from the

Long ciliary and short ciliary nerves, which are branches of the nasociliary nerve (branch of V1)

16

Pass through the ciliary ganglion on their way to the eyeball

Sensory fibers in short ciliary nerve

17

What are the other sensory nerves that pass through the orbit to provide general sensory innervation to the face, paranasal sinuses, and cranial cavity?

Frontal nerve, lacrimal nerve, infraorbital nerve, and zygomaticotemporal and zygomaticofacial nerves

18

All of the sensory fibers of the trigeminal nerve have their cell bodies in the trigeminal ganglion located in the

Middle cranial fossa

19

Prior to entering the orbit, CN V1 divides into the

Lacrimal, frontal, and nasociliary nerves

20

Within the orbit, the frontal nerve divides into the

Supraorbital and supratrochlear nerves

21

Gives rise to the Sensory root of the ciliary ganglion, the long ciliary nerve, the ethmoidal nerves, and the infratrochlear nerve

Nasociliary Nerve

22

Provides sensation from the eyeball

Sensory root of ciliary ganglion and long ciliary nerve

23

PRovides sensation from the ethmoid air cells, the anterior cranial fossa, and the nasal cavity

Ethmoidal nerves

24

Provides sensation from the face

Infratrochlear nerce

25

Prior to entering the orbit, CN III divides into a

Superior and inferior division

26

The superior division of CN III carries SOMATIC motor innervation to the

Levator palpebrae superioris and superior rectus

27

The inferior division of CN III carries somatic motor innervation to the

Inferior and medial rectus and the inferior oblique

28

The inferior division of CN III also carries preganglionic parasympathetic innervation to the

Ciliary ganglion

29

CN IV and CN VI enter the orbit and each innervate one muscle, which are they?

CN IV = superior oblique
CN VI = lateral rectus

30

A branch of the internal carotid artery that enters the orbit through the optic canal along with the optic nerve

Opthalmic artery

31

Sole blood supply to the visual receptor cells of the retina

-Branch of opthalmic artery

Central artery of the retina

32

Communicates with several veins of the face, receives tributaries within the orbit, and then exits the orbit through the superior orbital fissure to enter the cavernous sinus

Superior opthalmic vein

33

Receives tributaries within the orbit and then divides into two branches

Inferior opthalmic vein

34

One branch exits the orbit through the inferior orbital fissure to drain into the

Pterygoid plexus in the infratemporal fossa

35

The other branch drains into the

Superior opthalmic vein

36

Usually the pressure gradient of the opthalmic veins is such that blood flow is from

Within the cranial cavity outward

37

Can travel to the cavernous sinus and may lead to septic cavernous sinus thrombosis (potentially fatal)

Superficial cutaneous infection of the face

38

Which structures passTHROUGH the common ring tendon of the four rectus muscles?

1.) CN II
2.) CN III (sup. & inf.)
3.) CN VI
4.) Nasociliary nerve of V1
5.) Opthalmic artery

39

What are the structures that pass OUTSIDE of the ring tendon?

1.) CN IV
2.) Frontal and lacrimal nerves of V1
3.) Infraorbital and zygomatic nerves of V2
4.) Opthalmic veins

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