1.4: Orbital Autonomics Flashcards Preview

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Flashcards in 1.4: Orbital Autonomics Deck (49)
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1

What holds the eyes in their vertical position?

The suspensory ligament

2

Where does the suspensory ligament attach?

Laterally, it attaches to the zygoma

Medially, it attaches to the maxilla

3

Describe what can happen during ocular trauma when the zygoma is damaged?

Zygoma is damaged

Suspensory ligament lowers the eye on one side

Can lead to diplopia

4

What is diplopia?

Double Vision

5

Orbital trauma can lead to damage to the XXXX

This results in a general sensory deficit of the YYYYY

Orbital trauma can lead to damage to the neurovascular bundle

This results in a general sensosry deficit of the facial skin

6

What supplies 

Purple

Blue 

Pink?

CN V1 Opthalmic Nerve

CN V2 Maxillary Nerve

CN V3 Mandibular Nerve

7

What nerve is supplying the skin? (Purple)

CN V1

Opthalmic Nerve

 

8

What supplies the:

- Forehead

- Upper Eyelid

- Cornea

- Conjunctiva

- Skin of the top of the nose

CN V1

Opthalmic

9

What nerve is supplying the skin?

(Blue)

CN V2

Maxillary

10

What supplies the:

- Skin of the lower eyelid

- Skin over the maxilla

- Skin over the ala of the nose

- Skin/mucosa of the upper lip?

CN V2

Maxillary

11

What nerve is supplying the skin?

(Pink)

CN V3

Mandibular

12

What supplies the skin over the TMJs and the mandible?

CN V3

Mandibular

13

What supplies the angle of the mandible?

C2,C3 Spinal Nerves

14

Describe the blink reflex

- Action potentials conducted centrally via CN V1 to the trigeminal ganglion

- Then conducted in CN V to the Pons

- CNS connections between CN V and CN VII

- Action potentials are conducted peripherally via CN VII to the eyelid part of the orbicularis oculi

15

What are the two nerves involved in the blink reflex?

CN V (Specificially CN V1)

CN VII

16

Briefly describe the path of sympathetic axons from the CNS to the organs of the head region?

 - Cell body of the presynaptic neurone in the CNS
- Presynaptic Axon

- Ganglion 

- Postsynaptic Axon

- Organ

17

SYMPATHETIC

What is released by the presynpatic axon?

What is released by the postsynaptic axon?

Presynaptic axon releases acetylcholine

Postsynaptic axon releases noradrenaline

18

Describe the pathway presynpatic sympathetic axons from the CNS?

Descend in the spinal cord

Exit spinal cord at T1 spinal nerve

Ascend within the sympathetic trunk

Synapse in the superior sympathetic ganglion

19

Descrieb the pathway of the post-synaptic axons from the CNS?

- Enter the internal and external carotid nerve

- Pass onto the surface of the internal and external carotid arteries

- Carried to the organs on the surface of the branches of these arteries

20

What carries sympathetic axons (post-synaptic) into the orbit?

Opthalmic Artery

(Branch of the internal carotid)

21

What does this photo show?

The superior cervical sympathetic ganglia passing alongside the internal and external carotids

Then axons go onto the surface of the carotids

22

Is the ganglion located inside or outside the organ in:

- Sympathetic

- Parasympathetic

Sympathetic = Outside

Parasympathetic = Inside

23

Briefly describe the path of parasympathetic axons of the CNS to the organs of the head region?

- Cell body of the presynaptic neurone in the CNS
- Presynaptic axon in CN III, VII, IX, X

- Ganglion

- Postsynaptic Axon

- Organ

 

24

PARASYMPATHETIC

What is released by the presynaptic axon?
What is released by the postsynaptic axon?

Acetylcholine

Acetylcholine

25

Compare release of acetylcholine and noradrenaline in sympathetic and parasympathetic?

Sympathetic = Acetylcholine in pre

Noradrenaline in post

 

Parasympathetic = Acetylcholine in pre

Acetylcholine in post

26

Describe the exit of parasympathetic presynaptic axons from the CNS?

All leave the CNS in:

- CN III

- CN VII

- CN IX

- CN X

and in the sacral spinal nerves

27

Where do parasympathetic pre-synaptic axons from the CNS go 

- CN III

- CN VII?

CN III (Cranial Nerve 3)

Carries parasympathetic to the eye

To ciliary ganglion in the orbit

 

CN VII (Cranial Nerve 7)

Carries parasympathetic to the lacrimal duct, submandinbular, and sublingual salivary glands

28

Where do parasympathetic pre-synaptic axons go

- CN IX?

- CN X?

- Sacral spinal nerves?

CN IX = CN 9 = Glossopharyngeal

Supplies the parotid salivary gland

 

CN X = CN 10 = Vagus Nerve

Organs of the chest/neck/abdomen as far as the midgut

 

Sacral Spinal Nerves 

Hindgut, Pelvis, Peritoneum

29

What does CN III supply?

Oculomotor

- Somatic motor sensory to superior rectus, medial rectus, inferior rectus and inferior oblique

- Somatic motor sensory to the levator palpebrae superioris

- Presynaptic parasympathetic axons to the ciliary ganglion of the orbit

30

Label the picture (A-> F)

A = Ciliary Ganglion

B = CN III (Oculomotor)

C = CN VI (Abducens)

 D = CN III (Oculomotor)

E = Superior Orbital Fissue 

F = CN IV (Trochlear)