Autonomics

Autonomic Nervous System

Visceral motor

Acts on cardiac muscle, smooth muscle, and glands

Everything that you don't control "Automatic"

Autonomic components in CNS

Limbic system

Hypothalamus

Brainstem

Spinal cord

Autonomic components in PNS

Peripheral nerves

Cranial nerves

Spinal nerves

Preganglionic

myelinated

Postganglionic

unmyelinated

Autonomic motor

Slow conduction of an impulse

Smooth muscle, cardiac, glands

May be stimulatory or inhibitory

Sympathetic is used for

Fight or flight

Parasympathetic is used for

Rest and digest

Sympathetic nervous system

Effects on the body

Stimulate body

Sympathetic division

Use neurotransmitter

Preganglionic: Acetylcholine (1st message in chain)

Postganglionic: Epinephrine and Norepinephrine (2nd message)

Fight or flight

Increased heart rate

Sweating

Active during exercise, excitement, stress

Blood goes towards skeletal muscle

Adrenal medulla

Secretes epinephrine and norepinephrine

Sits on top of kidneys

"Adrenaline surge"

Parasympathetic (craniosacral) division

Neurotransmitters:

Preganglionic: Acetylcholine

Postganglionic: Acetylcholine

Rest and digest

Active when body is at rest

Blood shunted to internal organs

Long term response

Conserves energy

Maintain regular heartbeat, breathing rate, digestion

Somatic nervous system

Skeletal muscle

Voluntary