Session 6 Flashcards
Differentiate para and sympathetic with dilation
Parasympathetic-SM of iris is the pupillae sphincter.
Sympathetic-iris dilator
Where do the sympathetic arise from in the CNS?
What arteries do the sympathetic fibres use to hitchhike?
The thoracolumbar outflow T1-L2
Common carotid and it follows that route. Most synapse in the superior cervical ganglion.
Why can apex of lung pathology cause problem in face and eyes?
Syndrome and symptoms?
As the sympathetic fibres run along the common carotid and the lung pathology can compress this if close to it thus symptoms experienced.
Horners syndrome. Triad of ptosis partial,meiosis,anhydrosis.
What sympathetic muscle aids retraction of the eyelid?
Superior tarsal
Describe parasympathetic innervation to head and neck
Arise from brainstem from parasympathetic nuclei (Endinger Westphal). Hitch hike onto CN 3,7,9,10.
Synapse in parasympathetic ganglia (ciliary, submandibular, pterygopalatine,otic) note same order as number.
Hitch hike on branches of CN to target tissues.
2 sympathetic targets?
Parasympathetic?
Blood vessels and sweat glands
Lacrimal/mucosal/salivary
Parasympathetic role of oculomotor nerve?
Ciliary muscles change shape of lense and pupillae sphincter.
Describe pupillary light reflex
Light sensed by CNII taken to midbrain where detected by nuclei EDW. pre ganglionic CNIII fibres leaves EDW and synapse in ciliary ganglion reaching sphincter pupillae in both eyes.
How do parasympathetic of facial nerve reach target tissues?
Their two ganglia?
Via two branches.
Greater petrosal and chords tympani.
Pterygopalatine ganglion
Submandibular ganglion
Describe parasympathetic part of glossopahryngeal
Exits through jugular foramen then runs with timpanic nerve then exit middle ear as lesser petrosal nerve then synapses in otic ganglion.
The. Hitch hike on auriculotemporal nerve to parotid gland.
Different with vagus parasympathetic?
It’s ganglion are in the tissues
