ANS Phys Flashcards
Somatic NS involves (voluntary)
-Skeletal muscle
-only ONE motor neuron
-Consciously perceived senations
-can only excite
-NO ganglia
ANS Involvement (involuntary)
-Innervates cardiac and smooth muscle glands
-2 motor neurons
-unconsciously senses visceral sensations
-can excite or inhibit
-HAS ganglia
where are the sympathetic chain ganglia found?
parallel to the vertebral column
Sympethetic prevertebral/collateral ganglia are found
anterior to vertebral column near large abdominal arteries
The sympathetic NS connects to the adrenal medulla via:
Modified ganglia
parasympathetic terminal/intramural ganglia are found
near or in the wall of the organ it innervates
Location of the sympathetic NS
T1-L2 in the lateral grey horns
the location of the parasympathetic NS
Cranial nerves III, VII, IX, X and sacral lateral grey horns
Preganglionic length in the SNS
Short
Preganglionic Length in the PNS
Long
Post ganglionic length in SNS
Long
Post ganglionic length in the PNS
Short
SNS Neurotransmitter of postganglionic neuron
Norepinephrine NE
PNS Neurotransmitter of postganglionic neurons
acetlycholine ach
SNS =
Fight or flight responce
PNS =
Rest and digest
The adrenal medulla receives stimulation from:
sympathetic preganglionic fibers
Autonomic nervous system preganglionic fibres are
myelinated type B fibers