Neuroanatomy Draw It To Know It

6. Peripheral Nervous System—Autonomic Nervous System 101

DRAWING 6-4 Th e Urinary System

Detrusor

muscle

Somatomotor

efferents

Viscerosensory

afferents

Parasympathetic

efferents

External

urethral sphincter

Pontine micturition center

& Pontine continence center

Bladder

Urethra

Sympathetic

efferents

Paravertebral

chain &

Inferior

mesenteric

ganglion

Onuf ’s

nucleus

T12-

L2

S2-

S4

Superior hypogastric

Hypogastric plexus

nerve

Inferior

hypogastric

plexus

Pelvic

splanchnic

nerve

Pudendal

Internal nerve

urethral

sphincter

Parasympathetic

(vesical)

ganglion