Anatomy Review Slides Lec. 21 Flashcards
Fxn of the Vagus Nerve parallel to the Esophagus?
Innervate the Esophagus
ANS background
- 2 Divisions
- Entirely MOTOR
- DUAL innervation for Most structures
(Sympathetic and Parasympathetic) - 2 Neuron pathways
Characteristic of the 1st Thoracic ganglia
Usually Fused w/ INF Cervical Ganglia
Known as Stellate
The LEFT Vagus Nerve becomes what?
The ANTERIOR Vagal Trunk
“LA”
Actions of the Parasympathetic nerves
- Secretion of digestive fluids
- Peristaltic contractions
Lesser Splanchnic Nerve
- Originates?
- Synapses?
- T10 - T11
2. Synapses of the MESENTERIC ganglion
LEFT Recurrent Laryngeal Nerve
- From Left Vagus
- Hooks around the AORTIC ARCH
Thoracic Symp Chain
- Cervical Ganglia
- Lies Against Neck of RIBS and Costo-vertebral Jxns
Vagus Nerve Background
- CN X
- Major Parasympathetic supply to the ABDOMINAL viscera
2 Divisions of the ANS
Sympathetic
- T1 - L2
Parasympathetic
- C3, 7, 9, 10 & S2-S4
Actions of Sympathetic Nerves
- Inhibit digestive secretions
- Inhibits peristalsis
- Closes Involuntary sphincters
- Constricts blood flow to GUT
Greater Splanchnic Nerve
- Originates?
- Synapses?
- T5 - T9
2. Synapses on the CELIAC ganglion
POST-Ganglionic Neurons
- Originate from the GANGLION
- NEVER Myelinated
- Utilizes Norepinephrine
How many Cervical ganglia are there?
3 Total
- Superior
- Middle
- Inferior
Sympathetic Nerves
- Synapses with LARGE ganglia located in dorsal walls of COELOM
- Involved in responses regulated to
1. Anger
2. Fear
3. Anxiety
The Splanchnic Nerves
3 Total
- Greater
- Lesser
- Least
The RIGHT Vagus Nerve becomes what?
The POSTERIOR Vagal Trunk
“PR”
Parasympathetic Nerves
- Synapse on small Ganglion cell in WALL of target Organs
- Primarily responsible for Maintaining and Coordinating GUT Fxn
Least Splanchnic Nerve
- Originates?
- Synapses?
- T12
2. Synapses in in the AORTICORENAL ganglion
What do PRE-GANGLIONIC Neurons utilize?
ACh
PRE-Ganglionic Neurons
- Originate WITHIN Spinal Cord
- Always MYELINATED
- Synapses with the Post-gang neuron
- Utilizes ACh
RIGHT Recurrent Laryngeal Nerve
- From the RIGHT Vagus Nerve
- Hooks around the SUBCLAVIAN Artery
- Arises in the NECK
How many thoracic ganglia pairs are there?
12
What do POST-GANGLIONIC Neurons utilize?
Norepinephrine
