Autonomic Innervation of the Head & Neck Flashcards
where does sympathetic innervation originate from
autonomic centres in the brain, passes down the spinal cord
where does sympathetic innervation exit the spinal cord
with the T1-L2 spinal nerves
describe the sympathetic innervation route after leaving the spinal cord
travel to sympathetic chains running length of vertebral column, pass into all spinal nerves, pass into splanchnic nerves to eventually supply organs
at what level do the presynaptic sympathetic axons that innervate the neck and head exit the spinal cord and where do they travel
exit at T1 and ascend within the sympathetic chain
where do the sympathetic axons that supply the head and neck synapse
synapse in superior cervical sympathetic ganglion
describe the pathway of the post-synaptic sympathetic axons of the head and neck
they enter internal and external carotid nerves, pass onto surface of the internal and external carotid arteries, then carried to organs of the head on surface of artery branches
what artery carries sympathetic axons to the orbit of the eye
ophthalmic artery
how do all parasympathetic axons leave the CSN
via cranial nerves III, VII, IX and X and via sacral spinal nerves
(craniosacral outflow)
what parasympathetic ganglion supplies the eye, and what cranial nerve does it arise from
the ciliary ganglion, from CN III(Oculomotor)
where does the oculomotor nerve(CN III) travel from the CNS
passes through cavernous sinus and exits via superior orbital fissure, splits into 2 division superior and inferior
what are the 2 general functions of the CN III in terms of the eye
somatic motor supply to majority of extraocular muscles and presynaptic parasympathetic axons to the ciliary ganglion
what is CN V
Trigeminal nerve
what is CN V split into
CN V1- ophthalmic nerve
CN V2- maxillary nerve
CN V3- mandibular nerve
what cranial nerve supplies the face
CN V
what part of the face does CN V1(ophthalmic nerve) supply
upper eyelid, cornea, conjunctiva
