Nervous system in the abdomen and pelvis

Nervous system in the abdomen and pelvis

Targets of NS in abdomen and pelvis
Abdominal muscles (motor)
Body wall & parietal peritoneum (sensory)
Perineal muscles (motor)
(eg. external anal sphincter)
Perineal skin (sensory)
Sweat glands, erector pilae & sm mm of BVs in abdominal and perineal skin
Foregut smooth muscle & glands
Midgut smooth muscle & glands
Kidneys and suprarenal glands
Hindgut smooth muscle & glands
Blood vessels of GIT
Pelvic viscera and blood vessels
Smooth muscle & glands of reproductive tract
Blood vessels in erectile tissue

SYMPATHETIC
Gray rami of chain
ganglia
Thoracic
splanchnic nerves:
Lumbar splanchnic nerves
Sacral splanchnic Nerves
Prevertebral ganglia


PARA-SYMPATHETIC
Vagus
Pelvic splanchnic nerves
Intramural ganglia/enteric nervous system
SOMATIC
Abdomino-inercostal nerves
L1 spinal nerve
Pudendal nerve
ANS in the abdomen and pelvis:
important principles
Autonomic nerves are found in plexuses along the blood vessels or other major structures
In thorax:
In abdomen:
In pelvis:
Prevertebral plexus for abdominal viscera
Several parts: named for adjacent vessel or region

Lecture Plan
* Parasympathetic innervation of GIT and other structures
* Sympathetic innervation of GIT and other structures
* Referred pain
* Somatic nerves of the abdomen, pelvis and perineum
* Sympathetic
* Parasympathetic
ANS Divisions
Parasympathetic division
Intramural neurons are part of the enteric nervous system:
Parasympathetic Vagal trunk dissection
Left and right vagus nerves
Anterior (left) and posterior (right)
vagal trunks
Esophageal plexus
Parasympathetic
Pelvic splanchnic nerves
Targets of NS in abdomen and pelvis
Foregut smooth muscle & glands
Midgut smooth muscle & glands
Hindgut smooth muscle & glands
Pelvic viscera
Blood vessels in erectile tissue
Supply motor fibers to intramural ganglia
Greater thoracic splanchnic nerve
Targets of NS in abdomen and pelvis
Foregut smooth muscle & glands
Midgut smooth muscle & glands
Kidney, adrenal gland
Blood vessels of GIT
Hindgut smooth muscle & glands
Pelvic viscera (involuntary sphincters)
Smooth muscle and glands of reproductive tract
Lumbar splanchnic nerves
Sacral splanchnic nerves
Gray rami of chain ganglia
Lecture plan
* Parasympathetic innervation of GIT and other structures
* Sympathetic innervation of GIT and other structures
* Referred pain
* Somatic nerves of the abdomen, pelvis and perineum
Pain in the abdomen
Somatic pain
Example of visceral pain afferents
conveyed with sympathetic system
e.g. from stomach
* Pain originating from one structure but perceived as coming from another. Thus, pain from an organ can be perceived as originating from a somatic structure.
* Due to cross-talk in the CNS sensory pathways? brain misperceives origin of pain
* You can predict the site of referral, if you know the entry segment of visceral afferents, and the body’s dermatome map.
Involvement of parietal serous membranes
and much more are covered in this presentation.

Nervous system in the abdomen and pelvis.ppt