Autonomics Of the Body Wall Flashcards
What is the sympathetic preganglionic route
Lateral horn (T1-L2 ) Ventral root Spinal nerve WRC sympathetic chain
What are the sympathetic targets in the body wall and limbs
Sweat glands
Vascular smooth muscle
Arrector pilli muscles
Where do the ganglia synapse for Sympathetics to spinal nerves at T1 -L2
They synapse at the same spinal level
Sympathetic supply to spinal nerves above T1
Ascend in chain
Synapse in cervical ganglia
Post ganglionics exit the chain to join C1- C8
Symptoms to spinal nerves below L2
Descend the chain
Synapse In lower lumbar and sacral ganglia
Post ganglionics exit the chain to join L3-S3
What do the dorsal and ventral rami of spinal nerves above T1 innervate
Neck / upper limbs above T1 level
What do the dorsal and ventral rami of spinal nerves at T1 -L2 innervate
The body wall at T1 -L2 levels
What do the dorsal and ventral rami of spinal nerves below L2 innervate
The body wall below L2 and lower limbs
Cranial outflow for parasympathetics
Cranial nerves : 3,7,9 - head and neck
Cranial nerve 10 - rest of the body
Sacral outflow for Parasympathetics
S2 -4
GUT and pelvic organs
Preganglionic parasympathetics - sacral route
Cell bodies in the lateral horn like area of sacral spinal cord
Axons travel on the ventral roots to spinal nerves and then ventral rami of S2-S4
Leave the ventral rami as pelvic splanchnic nerves to enter pelvic plexus
Where are the sacral post ganglionic parasympathetics located
In the walls of target organs in the pelvis
Visceral afferents traveling with parasympathetics
Mediate unconscious sensations such as atrial stretch or GI stretch
Visceral afferent traveling with sympathetics
Mediate conscious sensations that are usually painful
Referred pain
Pain interpreted as coming from the area of high sensory input
