8.2 ANS Flashcards
Sympathetic nervous system activation causes
Vision improvement, decrease in fine motor skills and digestion
Ganglion
Group of cell body of neurons
Motor neurons cell body originate
Somewhere in the spinal cord (or cranium if it’s a cranial nerve)
Somatic motor neurons are
Consciously controlled, one long step no breaks or ganglion
Sympathetic branch has
Very short pre ganglion neuron, long post ganglion neuron
Distribution
Parasympathetic branch has
Long pre ganglion neuron, short post ganglion neuron
Precise off switches, not systematic
Preganglion neurons (and parasympathetic post ganglion) NT chemical messenger released in synapse
acetylcholine (ACh)
Sympathetic branch post ganglion neuron NT released
Norepinephrine (NE) & Epinephrine
All sympathetic fibers originate
Somewhere in thoracic or lumbar spine
Thoracolumbar (T1-L3)
The adrenal gland is a modified synapse of
The sympathetic branch of the ANS, releasing NT as endocrine hormones
Parasympathetic fibers originate from the
Craniosacral regions (cranium and sacrum)
The only cranial nerve to leave the cranium
CN X (vagus nerve), controls heart lungs abdomen
Urinary function and reproductive function regulated by
Parasympathetic nerves coming off the sacrum
Vasovagal response
Pressure on the vagus nerve can cause you to faint
Alpha 1 adrenergic receptors
Cause constriction of smooth muscle when stimulated
