Innervation
4
Plate303
Levator
ani muscle
External anal
sphincter muscle
Superior rectal artery and nerves
Rectal plexus
Inferior anal (rectal) nerve
Sympathetic efferents
Parasympathetic efferents
Somatic efferents
Afferents and CNS connections
Indefinite paths
L1, 2
T12, L1
T9 (8)
T9, 10
T10–12
T10 (11)
T10–12
L1, 2
Chief segmental sources
of sympathetic fibers
innervating different
regions of intestinal
tract are indicated.
Numerous afferent
fibers are carried
centripetally through
approximately the same
sympathetic splanchnic
nerves that transmit
preganglionic fibers.
AutonomicInnervationofSmallandLargeIntestines:Schema
See±also±
Plates 163,
±
164
