Eye Autonomics Flashcards
Which areas of the eye are supplied by CN V1?
Upper eyelid
Cornea
Conjunctiva
What area of the eye is supplied by CN V2?
Skin of lower eyelid
Outline the afferent limb of the blink reflex
APs are conducted from cornea via CN V1 to trigeminal ganglion then along CN V to pons
Outline the efferent limb of the blink reflex
APs are conducted via CN VII to the eyelid part of orbicularis oculi
Describe the path of presynaptic axons from the CNS in the cervical part of the sympathetic trunk
Exit spinal cord in T1 and ascend within sympathetic trunk before synapsing in superior cervical sympathetic ganglion
Describe the path of post-synaptic sympathetic axons from the cervical part of the sympathetic trunk
Enter internal/external carotid nerves which pass onto surface of internal/external carotid arteries which are carried to head organs on artery branches
Describe the path of CN III in the brain
Connects with CNS between midline and pons then passes though cavernous sinus and exits via superior orbital fissure
What is the origin of the ciliary ganglion?
Presynapatic parasympathetic axons of CN III
What do the ciliary nerves supply?
Autonomic axons to control diameter of iris and shape of lens
What is the vestibulo-ocular reflex?
When eye direction remains the same in head movement
What is the oculocardiac reflex?
Reflex bradycardia in response to tension on extraocular muscles
Describe the sympathetic functions of the eye
Open eyes wider
Get more light into eye
Focus on far objects
Describe the parasympathetic functions of the eye
Allow orbicularis oculi to work
Get less light into eye
Focus on near objects
A non-physiologically enlarged pupil is known as?
Mydriatic pupil
A non-physiologically constricted pupil is known as?
Miotic pupil
