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ANS-bio5 sc


3 ANS Neurotransmitters 1. Acetylchoine (A Ch)- all PNS preganglionic and postganglionic neurons neurons, all SNS preganglionic neurons 2. Norepinephrine-released by most postganglionic neurons of the SNS 2. Epiphrine-released by the adrenal medulla
Axons of the two neuron chain in ANS 1. Preganglionic neuron- cell body of neuron is in CNS, releases ACh 2. Postganglionic neuron- cell body of neuron is in ganglion, releases norepinephrine (sympathetic) and ACh (Parasympathetic)
What is a neurotransmitter? a chemical that gets released
Parasympathetic division of ANS Performs maintenance activit├ęs and conserves energy; "rest and digest" ex. digestion, urination and defecation
Sympathetic division of ANS "fight or flight", burns energy, increases activities, mobilizes the body during activities; ex. exercise, excitement, embarrassed and emergency
Origin site of sympathetic divisions and length of its neurons thoracolumbar- emerges from thoracic and lunar regions T1-L2 nuerons- short preganglionic, long postganglionic
Location of sympathetic ganglia close to vertebral column, where pre synapses with post.
Somatic nervous system Controls skeletal muscles, voluntary. Muscles must be excited or they are inactive. Axons extend from CNS to effects, release ACh
Autonomic Nervous system Effects glands, smooth and cardiac muscles, involuntary. Axons are in a two- neuron chain.
location of sympathetic chain ganglia chain runs parallel to vertebral column, extends from C3 to C4
location of collateral ganglia lie anterior to the vertebral column
Location of sympathetic neuron's cell bodies in the lateral gray horns of spinal segments T1-L2
White ramus communicans preganglion passes from the spinal nerve to the sympathetic trunk ganglion
gray ramus communicans post ganglion exits the sympathetic trunk ganglion
3 synaptic routes of sympathetic neurons 1) synapse in ganglion (same level). 2) travel through sympathetic trunk and synapse at different ganglion. 3) travel through and synapse at plexus
Created by: holt.gracea



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