Autonomic nervous system ANS - uobabylon.edu.iq

Autonomic nervous system ANS

It involuntarily regulate the every day

needs and requirement of the vital

body function without conscious of the

mind

Nervous system

PNS C NS

*Afferent N *Brain

*Efferent N *spinal cord

ANS Somatic NS

paraSympathetic

C(3,7,9,10)

S2-4 and synapse

sympathetic

T & L region

Enteric(Brain of gut) GIT,pancreas ,gall blader

Exo-endocrine, Motility,

Microcirculation

both

*parasympathetic = Cholinergic

R. = Nicotinic

Muscarinic

Preganglion fiber long ,post short

Neurotransmitter = acetyl cholin

*Sympathetic = Adrenergic

R. = α1,2 & β1,2,3

Preganglion short fiber ,post long

Neurotransmitter =adrenaline & noradrenaline

epinephrine & nor epinephrine

ANS Somatic

Ach Ach Ach

Preganglionic

neuron

Post ganglionic

neuron

parasympathetic sympathetic sympathetic

Ach Norepinephrine Norepinephrine

Adrenal medulla

Nicotinic

receptor

Nicotinic

receptor

Nicotinic

receptor

Adrenergic R Adrenergic R Muscarinic R

No ganglia

Nicotinic R

neurotransmitter

Neuro

transmitter In to

blood Ach

Ach = acetylcholin

Innervation:

*Dual

*Sympathetic

sweat, kidney , pilomotor, adrenal

*Somatic

Effect of parasympathetic NS

- Exocrine glands: secreation

Salivary ( watery), sweat, lacrymal,

bronchial glands

- Eye : constriction of pupil (miosis)

contraction of ciliary M

(lens accommodation for near vision)

-heart : bradycardia

-BV: IP3 ca EDRF(NO) BP

-lung : bronchospasm

-bladder :contraction of detruser M ,

relaxation of sphincters micturation

-GI : *motility and gland sec

*dilate sphincter

-Sex organ: Erection

SNS -heart : rate & force

BV : constriction except SK M

GI : *motility( relax sm)

*constrict sphincter

*NO eff on gland

Uterus : *relaxation in non pregnant

Sex organ :Ejaculation

- Eye : dilatation of pupil (mydriasis)

relaxation of ciliary M

(lens accommodation for far vision)

-Hair (pilomotor) : piloerection

-Salivary : thick and viscus

-bladder : *relaxation of detruser M

*contraction of sphincters

Lung :dilate bronchiols

REST

FEAR ,FLIGHT & FRIGHT