Pelvic Viscera Pt. 2 Flashcards Preview

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Flashcards in Pelvic Viscera Pt. 2 Deck (39):
1

In general, in the Pelvis, sympathetic motor innervation causes what two things?

1.) Contraction of smooth muscle sphincters
2.) Vasoconstriction of blood vessels

2

In general, in the Pelvis, parasympathetic motor innervation causes

1.) Relaxation of smooth muscle sphincters
2.) Stimulates smooth muscle contractions of the bladder and rectum

3

In the pelvis, PREGANGLIONIC SYMPATHETIC neurons have their cell bodies located in the

Lateral horn of spinal cord segments L1 and L2

4

Axons enter the sympathetic chain via white rami communicans with most of them passing through the L1, L2 ganglia exiting as

Lumbar Splanchnic nerves

5

The PREGANGLIONIC SYMPATHETIC fibers in the lumbar splanchnic nerves may enter the

Superior or inferior mesenteric ganglia and synapse

6

Additionally, some PREGANGLIONIC SYMPATHETIC fibers will continue along the aorta and enter the

Superior hypergastric plexus

7

The superior hypogastric plexus is located at the

Aortic bifurcation

8

These PREGANGLIONIC SYMPATHETIC fibers will then enter the pelvis using the

Right or left hypogastric nerves

9

The right and left hypogastric nerves end in the

Inferior hypogastric plexus

10

The inferior hypogastric plexus is located along the walls of the

Pelvic Viscera

11

To recap, the PREGANGLIONIC SYMPATHETIC may synapse on POSTGANGLIONIC sympathetic cell bodies located in either the

Superior mesenteric, inferior mesenteric, or inferior hypogastric plexuses

12

POSTGANGLIONIC SYMPATHETIC axons travel with blood vessels or leave the inferior hypogastric plexus directly to the

Smooth muscle of the viscera they innervate

13

The cell bodies of PREGANGLIONIC PARASYMPATHETIC neurons are located in spinal cord segments

S2, S3, and S4

14

PREGANGLIONIC PARASYMPATHETIC axons branch from ventral rami of S2, S3, and S4 and merge to form the

Pelvic splanchnic nerves

15

Most of these PREGANGLIONIC PARASYMPATHETIC fibers enter the inferior hypogastric plexus where they synapse on postganglionic cell bodies. While others travel to ganglia located on the walls of the

Viscera

16

Where are the POSTGANGLIONIC PARASYMPATHETIC cell bodies located?

Inferior hypogastric plexus of the walls of the viscera they innervate

17

Convey reflex information such as the degree of bladder filling or pain

Visceral afferent nerves

18

In general, reflex afferents travel with

PARASYMPATHETIC nerves

19

In general, pain afferents travel with

SYMPATHETIC nerves

20

However, in the pelvis, both SYMPATHETIC and PARASYMPATHETIC fibers carry

Pain fibers

21

Delineates which system (sympathetic or parasympathetic) the pain fibers will travel

Pelvic Pain line

22

Viscera above the pelvic pain line

Intraperitoneal Viscera

23

Above the pelvic pain line, visceral pain from the intraperitoneal pelvic viscera accompanies

Sympathetic fibers via hypogastric plexuses to T11-L1

24

What are the structures of the intraperitoneal viscera?

Fundus and body of uterus, uterine tubes, and ovaries

25

Thus, uterine contractions are referred to regions supplied by these levels and manifest as

Lower back pain

26

Viscera below the pelvic pain line

Subperitoneal Viscera

27

Below the pelvic pain line, visceral pain travels via

Pelvic splanchnic (parasympathetic) nerves to S2-S4 spinal cord levels

28

What are the structures of the subperitoneal viscera?

Cervix, upper vagina, and bladder

29

What are the 5 autonomic structures of the pelvic viscera?

1.) Lumbar splanchnic nerves
2.) Intermesenteric plexus
3.) Superior hypogastric Plexus
4.) Right and left hypogastric nerves
5.) Inferior hypogastric plexus

30

Contain PREGANGLIONIC SYMPATHETIC fibers from spinal cord levels T11-L2 that enter the preaortic ganglia

-Also carry visceral afferents

Lumbar splanchnic nerves

31

Contains PRE- and POSTGANGLIONIC SYMPATHETIC nerve fibers running between preaortic ganglia

Intermesenteric plexus

32

At the bifurcation of the aorta, the intermesenteric plexus ends as the

Superior hypogastric plexus

33

Contains PRE- and POSTGANGLIONIC SYMPATHETIC fibers from the intermesenteric plexus

Superior Hypogastric Plexus

34

NO synapses occur within the

Superior Hypogastric plexus

35

Carry PRE- and POSTGANGLIONIC SYMPATHETIC fibers from the superior hypogastric plexus down into the pelvis to the right and left inferior hypogastric plexuses

-Also carry visceral afferents

Right and Left Hypogastric nerves

36

Contain cell bodies of POSTGANGLIONIC SYMPATHETIC neurons

Inferior hypogastric plexuses

37

PREGANGLIONIC SYMPATHETIC fibers synapse on POSTGANGLIONIC cell bodies here

Inferior Hypogastric plexuses

38

POSTGANGLIONIC SYMPATHETIC fibers then travel from the inferior hypogastric plexuses with branches of the

Internal iliac artery

39

Contains PRE- AND POSTGANGLIONIC SYMPATHETIC and PRE- AND POSTGANGLIONIC PARASYMPATHETIC nerves as well as visceral afferents

Inferior hypogastric plexuses

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