CVR 12 ANS Flashcards
Where do sympathetics come from?
T1-L2 spinal
Where do parasympathetics come from?
3,7,9,10,
S2-S4
What does a sympathetic look like
butterfly grey shaped, lateral horn where cell body of ANS come from exiting. Also with somatic motor through mylenated white ramus.
What are the only grey parts of the sympathetics
post ganglionic gray ramus communicans
Pre ganglionic fibres run up and down where?
before syapsing
Post ganglionic fibres run up and down where?
before exiting
Where is the thoracic splanchic nerves?
under parietal pleura, crosses neck of 1st rib.
Passes behind medial arcuate ligaments continues as lumber. T1 joins stellate ganglion
Phrenic nerve will
remain anterior and lateral
Vagus will run
medially and posteriorly
Vagus will enter as
vagal nerves and exit as vagal trunks
3 major sets of plexuses
cardiac in the thorax
coeliac in the abdomen
hypograstric pelvis
Describe the sympathetic course to the SA AV node?
pre ganglion cell bodies in the upper thoracic cord synapse with post glanglionic cells body in the cervical and upper thoracic which run to SA AV nodes
Parasympathetic course to heart?
preganglionic fibres via vagus nerve.
Post ganglionic fibres SA and AV nodes
What is the main driver in the cardiac output?
sympathetic unless certain situations. how much or how little.
Why are we unable to distinguish between viscerala nd somatic pain in MI?
Cardiac cells die, pain fivres viscera afferents stimulated which run along sympathetics therefore somatic senses arising from dermatomes T2 T4
