Innervation of the Abdominal Viscera Flashcards Preview

GI Midterm S'17 > Innervation of the Abdominal Viscera > Flashcards

Flashcards in Innervation of the Abdominal Viscera Deck (15):
1

What are the three branches of the lower splanchnic nerves that innervate the abdominal viscera (give their respective spinal levels as well)

Greater Splanchnic Nerve: T5-T9 Lesser Splanchnic Nerve: T10-T11 Least Splanchnic Nerve: T12

2

What lower thoracic splanchnic nerve is the main source of presynaptic nerve fibers innervating the abdominal viscera?

Greater Splanchnic Nerve (T5-T9)

3

The lower thoracic splanchnic nerves convey presynaptic sympathetic fibers to what adominal structures?

Celiac, Superior Mesenteric, & Prevertebral Sympathetic Ganglia

4

The lumbar splanchnic nerves covey presynpatic sympathetic fibers to what abdominal structures?

Intermesenteric, Inferior Mesenteric, and Superior Hypogastric Plexus

5

What are the two main divisions of parasympathetic innervation to the GI system?

1) Anterior and Posterior Vagal Trunks 2) Pelvic Splanchnic Nerves

6

Anterior and Posterior Vagal Trunks: 1) Continuation of ? 2) Function ?

1) Right and left Vagus nerves; respectively 2) Parasympathetic innervation of the smooth muscle and glands up to the Left colic flexure

7

Pelvic Splanchnic Nerves: 1) Derived from 2) Function

1) Anterior Rami of S2-S4 2) Parasympathetic innervation from left colic flexure to the remainder of the GI system

8

Pelvic Splanchnic nerves: 1) Characteristics 2) Derived from 3) Pathway/Contribution

1) Not associated with sympathetic trunk 2) Derived from anterior rami of spinal nerves S2-S4 3) Presynaptic parasympathetic nerve fibers to inferior hypogastric plexus

9

Enteric Nervous System: 

1 &2) Two Principle Components 

A) Their function

B) Sympathetic or Parasympathetic

1) Myenteric (Auerbach's) Plexus A) Motility B) Parasympathetic 

2) Submucosa (Meissner's) Plexus A) Secretion/Absorption B) Sympathetic 

 

10

Nerves of Superior Mesenteric Plexus: 

1) Sympathetics

2) Parasympathetics

1) Greater and lesser splanchnic Nerves & GVA pain fibers

2) Median root from celiac plexus, branch of posterior vagal trunk, GVA visceral reflex fibers 

11

Nerves of Inferior Mesenteric Plexus: 

1) Sympathetic

 2) Parasympathetic

1)  Lumbar ganglia of sympathetic trunk & GVA pain fibers

2) Medial root from intermesenteric plexus (continuation of vagus), GVA reflex fibers

12

Superior Hypogastric Plexus: 

1) Characteristics

2) Supplies

3) Sympathetics or Parasympathetics

4) Connections

1) Anterior abdominal aortic bifurcation & continuous with intermesenteric and inferior mesenteric plexuses 

2) Uteric and Testicular Plexues

3) Only sympathetics

4) Connected to inferior hypogastrix plexus via R/L Hypogastric nerves

13

Pain Afferents are conveyed via?

Sympathetic components to T5-L2

14

Reflex Afferents (information from chemoreceptors, osmoreceptors, and mechanoreceptors); these are conveyed to?

Autonomic centers in the medulla oblongata

15

Inferior Hyopgastric Plexus: 

1) Sympathetics

2) Parasympathetics

3) Output

1) Superior Sacral Sympathetics

2) Pelvic Splanchnics (S2-S4)

3) Visceral plexuses on walls of pelvic viscera