9 Autonomics Of The Eye And Orbit

Question 1

The sympathetic nervous system:

1) preganglionic neuron cell body is the spinal cord from __ to __
2) ____________ neuron is close by in the sympathetic chain. _____________ fibers are longest.
3) Primary NT is _______________

Answer 1

T1- L2

Post ganglionic. Post ganglionic

Norepinephrine

Question 2

Parasympathetic:

1) _______________ nerve cell body is located in brainstem or sacral spinal cord.
2) ___________ Cell body is in ganglion near the target organ. These fibers are short!
3) What’s the NT released?

Answer 2

Preganglionic

Postganglionic

Acetylcholine

Question 3

The iris dilator, ciliary muscle, smooth muscle of the lids, lacrimal gland are innervated by what system?

The iris sphincter, ciliary muscle, lacrimal gland are innervated by what system?

Answer 3

Sympathetic

Parasympathetic

Question 4

Regarding sympathetic stimulation..

1) _______ the iris dilator (pupils dilate; more light)
2) _____________ of choroidal and conjunctional vessels
3) widens the palpebral fissure by stimulating _______ muscle
4) exhibits a small ___________ effect on the ciliary muscle

Answer 4

Activates

Vasoconstriction

Mullers

Inhibitory

Question 5

Where is the preganglionic neuron located?

Answer 5

In the midbrain in the parasympathetic accessory third nerve nucleus.. called Edinger-Westphal nucleus

Question 6

Where’s the ciliary ganglion located?

What nerves on the anterior edge of the ciliary ganglion carry, sensory, sympathetic, and parasympathetic fibers?

Answer 6

Within the muscle cone between LR and optic nerve, 1cm anterior to optic canal

Short ciliary nerves

Question 7

What autonomic system innervates the iris?

The size of the pupil changes constantly and this physiologici pupillary unrest is called ______.

During sleep, pupils are _____ bc sympathetic shuts down and PS predominates

Answer 7

BOTH. PS innervates the sphincter and SS innervates the dilator

Hippus

SMALLlllllLL

Question 8

The Vidian nerve enters the ______________ ganglion, where the parasympathetic fibers synapse.

The postganglionic leave this ganglion, joins with ___________ branch of the trigeminal nerve, pass into the zygomatic nerve, then form a _____________ branch to lacrimal nerve

Answer 8

Pterygopalatine

Maxillary. Communicating

Question 9

Corneal touch initiates the 3 part corneal reflex:

1)
2)
3)_________ blink

Answer 9

Lacrimation

Miosis

Protective