autonomic pathways of the eye Flashcards
where does sympathetic innervated of the body originate from?
autonomic centres in brain
at which level do sympathetic fibres exit spinal cord?
T1-L2
where do sympathetic fibres pass into?
spinal nerves - ant and post rami
splanchnic nerves - supply organs
where do presynaptic sympathetic axons from CNS exit spinal cord?
T1
what do presynaptic sympathetic axons ascend within and where do the synapse?
within sympathetic chain
synapse in superior cervical sympathetic ganglion
where do post-synaptic axons enter?
internal and external carotid nerves
what are internal and external carotid nerves carried to organs of the head and neck on the surface of?
branches of internal and external carotid arteries
what artery carries sympathetic axons into the orbit?
ophthalmic artery (from internal carotid)
what do all parasympathetic axons leave CNS via?
CN III, VII, IX and X
sacral spinal nerves - craniosacral outflow
where does the parasympathetic ganglia in the head go to?
eye
lacrimal gland
salivary gland
what nerve supplies organs of neck, chest and abdomen as far as the mid-gut?
vagus
what carries sympathetic axons to hindgut, pelvis and perineum?
sacral spinal nerves
where is the parasympathetic ganglion located?
in bony orbit
fibres from which cranial nerve supply parasympathetic innervation?
CN III
what are the only types of fibres that synapse in the ganglion?
parasympathetic
where does CN III connect with CNS?
at junction of midbrain and pons
what does CN III pass through?
cavernous sinus
where does CN III exit?
superior orbital fissure
what are the 2 divisions of CN III?
superior and inferior
what does CN III supply?
somatic motor - majority of extraocular muscles
presynaptic parasympathetic axons - ciliary ganglion
