ANS review Flashcards
Sympathetic
pregang in T1-L2-3, Intermediolateral horn of grey matter
postgang in ganglia
-paravertebral chain-either side of SC
-prevertebral ganglia-celiac, superior etc
*SHORT PRE long post
Parasympathetic
pergang cranial CN3, 7, 9, 10 Sacral S2-4
postgang target organs
*long pre SHORT POST
only innervated by SNS
sweat glands
blood vessels
only innervated by PSNS
ciliary muscles of eye
bronchial smooth muscles
both SNS and PSNS have baseline tone ex:
Vagal PSNS predominance–HR
SNS tone–blood vessels
SNS normal receptors
pre on Nicotinic with Ach
post on ADRENERGIC with NE
*SAN
adrenergic receptors alpha and beta
PSNS normal receptors
pre on Nicotinic with Ach
post on Cholinergic-Muscarinic with Ach
*PCA
Cholinergic receptors
Nicotinic Ach: Nm-muscle Nn-Brain
Muscarinic Ach: M1-5
Adrenergic receptors
alpha 1,2
Beta 1,2,3
SNS involuntary control of
EYE: myosis
BLOOD VESSELS: shunt blood to heart, skeletal muscles. shunt blood AWAY from skin, kidneys, GI
SALIVARY GLAND: off-dry mouth
HEART: strong contractility, fast HR-AV node
LUNGS: dilate
ADRENAL M: secrete Epi
LIVER: release energy breakdown glucose
GI: calm
BLADDER: relaxed
GENITALIA: relaxed
SWEAT GLANDS: increase sweat from increase heat skeletal muscles
PSNS involuntary control of
EYE: miosis LACRIMAL GLAND: active, tears SALIVARY GLAND: active, secreting HEART: "relaxed" slow HR LUNG: mild constriction UPPER GI: active, pancreas, secreting LOWER GI: parastalsis BLADDER: contracted GENITALIA: can no reproduce
SNS abnormal
- Sweat glands: pre Nicotinic post Muscarinic all Ach (should be post adrenergic, and NE)
- Adrenal Medulla: pre only Nicotinic Ach then releases Hormones: 20%NE 80%Epi
Alpha 1’s Gprotein
GalphaQ-Excitatory, blood vessels
- PLC activated
- IP3 and DGA
- PKC and increased free Ca
* stronger contraction, smooth muscle vasoconstriction
alpha2’s Gprotein
Galpha i- inhibitory blood vessels, pre/postsynaptic
- inhibit adenylate cyclase
- decrease cAMP
- increase K conduction-hyperpolarize
* smooth muscle contraction, hyperpolarize
Beta 1,2,3’s Gprotein
GproteinS-Excitatory,
- activates adenylate cyclase
- Increase cAMP
* relaxes smooth muscle, broncodilates, stimulates heart contractility and increased rate