Autonomic nervous system

SYMPATHETIC OUTFLOW

Limbic system

Vasomotor sudomotor' (sweating) piloerectors

ARMS TRUNK

LEGS

Limbic system

Hypothalamus

Hypothalamus

Autonomic fibres in peripheral nerve to blood vessels, sweat glands and piloerector muscles in skin

2 Pupillary dilatation.

3 Cardiac acceleration. ^ Bronchodilator.

® Adrenal gland - adrenaline 8 and noradrenaline release.

9 Bowel 10 11 12

L1 Bladder 2

(decreases smooth muscle activity: stimulates sphincters).

Non-myelinated postganglionic fibres (grey ramus)

. Myelinated preganglionic fibres

(white ramus)

Sympathetic ganglion

Prevertebral ganglion

Fibres which pass through the sympathetic ganglion to synapse on a prevertebral ganglion, e.g. coeliac or mesenteric ganglia constitute the splanchnic nerves and innervate the viscera.

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