Autonomic Innervation Flashcards
Where do sympathetic preganglionic fibres arise and synapse?
Arise in the first thoracic neural segment
Synapse in either the superior, middle or inferior Cervical Sympathetic Ganglia
Describe the location of the sympathetic trunk
ANTEROLATERAL to the vertebral column
Lying on the prevertebral fascia and muscles
Deep to the carotid sheath
How do the sympathetic post ganglionic fibres travel?
Become the internal and external carotid nerves
Travel along blood vessels to target tissues
Where do sympathetic post ganglionic fibres from the superior cervical ganglion travel to?
The Pharyngeal Plexus
Upper 4 Cervical Nerves
Cardiac Plexus (as the cardiac branch)
Which artery do post ganglionic fibres from the superior cervical ganglion travel along?
Internal and external carotid arteries
Where do post ganglionic fibres from the Middle Cervical Ganglion travel to?
The 5th and 6th Cervical Nerves
Cardiac branch to the cardiac plexus
Which artery do post ganglionic fibres from the middle cervical ganglion travel along?
Inferior thyroid artery
Where do post ganglionic fibres from the inferior cervical ganglion travel to?
The 7th and 8th Cervical nerves
Cardiac branch to the cardiac plexus
Which artery do post ganglionic fibres from the inferior cervical ganglion travel along?
Vertebral artery
What is the Stellate ganglion?
Combination of the inferior cervical ganglion and 1st thoracic ganglion. Occurs in 80% of population
Name the 4 pairs of parasympathetic ganglia in the head
Ciliary ganglion
Pterygopalatine ganglion
Submandibular ganglion
Otic ganglion
Which 4 cranial nerves have brainstem nuclei?
CN III- oculomotor
CN VII- facial
CN IX- glossopharyngeal
CN X- vagus
Which 3 cranial nerves have branches that reach the ganglia?
Oculomotor -> ciliary ganglion
Facial -> ppterygoplatine/ submandibular ganglion
Glossopharyngeal -> otic ganglion
The vagus nerve doesn’t have discrete ganglia
How do the parasympathetic preganglionic fibres of the cranial nerves with brainstem nuclei pass?
Synapse either in the 4 ganglia or in the walls of the organs they supply in the neck, thorax and abdomen
What do the 4 ganglia do in terms of the parasympathetic, sympathetic and somatic nerve fibres?
Contain parasympathetic synapses
Give uninterrupted passage to sympathetic and somatic fibres