Anatomy: Reflexes of the Eye Flashcards Preview

Opthalmology > Anatomy: Reflexes of the Eye > Flashcards

Flashcards in Anatomy: Reflexes of the Eye Deck (34):
1

In which direction does a fractured zygoma tend to rotate

medially towards the floor of the orbit

2

What ligament may be damaged in a zygomatic fracture

The suspensory ligament of the eye

3

What can happens if the suspensory ligament lowers

diplopia

4

What else can be damaged in a fractured zygoma

the infraorbital NVB in the infraorbital canal

5

what can damage of the infraorbital canal result in

general sensory deficit of the facial skin

6

Which part of the mandible is not general snesory supplied by V3

the angle (supplied by C2, 3)

7

At what spinal cord level do presynaptic sympathetic axons from the CNS exit the spinal cord

T1 spinal nerve

8

Where do the sympathetic axons synapse

the superior cervical ganglion

9

Where do the postsynaptic sympathetic axons enter

the internal carotid nerve
the exernal carotid nerve

10

What carries sympathetic axons to the orbit

the ophthalmic artery (branch of the internal carotid)

11

What is the name given to the ganglia which is a fucion of the inferior cervical and 1st thoracic ganglia

the stellate ganglion

12

where do the presynaptic parasympathetic axons travel to for the eye

the ciliary ganglion

13

Where does the oculomotor nerve connect with the cns

the junction between the midbrain and the pons

14

which eye muscles are supplied by the superior branch of the oculomotor nerve

SR and LPS

15

which are supplied by the inferior branch of CN III

the MR, IR, and IO

16

What other structure does the inferior branch CN III supply

the cilirary ganglion

17

what do the ciliary nerves control

the diameter of the iris and thus the pupil
the refractive shape of the lense

18

Give the six autonomic reflexes of the eye

maximal eyelid elevation
pupillary light reflex
lacrimation
the accommodation reflex
the vestibule ocular reflex
the oculocardiac reflex

19

What is the oculocardiac reflex

the reflec bradycardia in repsinse to tension on the exrraocular muscle or pressure on the eye

20

What are the sympathetic eye function

open wider
more light in
focus on far objects
emotional lacrimation

21

What are the parasympathetic functions

orbicularis oculi function
less light in eyes
forcus near objects
reflec lacrimation (to wash away the foreign bodies etc)

22

What type of muscles is contained in the levator palpenrae superioros

skeletal and smooth

23

What autonomic system dilates the pupil

sympathetic

24

what is the name of a non physiologically dilated pupil

mydriatic

25

What is a pin point pupil and what is it often a sign of

a fixed - no response to light pupil
opiate drug use

26

What is the name for a non physiologically constricted pupil

miotic

27

When do you get a miotic pupil

horners

28

What is a fixed dilated pupil often a pathological sign of

oculomotor nerve pathology

29

What is the afferent special sensory limb of the pupillary light reflext

the optic nerve (ipsolateral)

30

Wht is the motor limb of the reflex

the bilateral oculomotor nerve - hence both pupils react the same

31

when does the cilliary muscle relax and the lens flatten

to focus on distant objects

32

When does the ciliary muscle contract and the lens shortens

to focus on near objects

33

what is the afferent limb of the tear reflex

ophthalmic nerve

34

what is the efferent limb of the reflex tears

the facial nerve