Lecture 15: Visceral Nervous System

Question 1

difference btw autonomic and somatic NS

Answer 1

autonomic: target= smooth/cardiac muscle and glands. ALWAYS 2 neurons btw CNS and target

somatic: target=skeletal. always 1 neuron

Question 2

which areas of spinal cord are innervated by sympathetic neurons? PS?

Answer 2

Symp: T1-L2 lateral horn

Para: Brainstem and S2-S4

Question 3

which CN are in brainstem and send out autonomic innervation

Answer 3

CN III, VII, IX, X

Question 4

what is a splanchnic nerve?

Answer 4

bypasses paravertebral ganglia, synapses with pre-vertebral. (only found in abdo cavity)

note: pelvic splachnic are the only PS splachnic nerve

Question 5

which postganlgionic fibres are shorter? PS or symp

Answer 5

PS

Question 6

label

Answer 6

A: Ventral root, carrying symp fibres
B: Gray Ramus Communicans carrying postganglionic fibres
C:Splanchnic neve
D:ganglia
E: White Ramus Communicans: carrying preganglionic fibres

Question 7

what does T1 supply

Answer 7

symp fibres to head, neck, upper limb

Question 8

what do symp fibres from t1-t4 reach

Answer 8

thoracic viscera

Question 9

what do fibres from t5-l2 carry and reach to?

Answer 9

symp fibres which bypass paravertebral ganglia and instead synapse with prevertebral (splanchnic)

target: abdominal/pelvic viscera

L2= lower limb

Question 10

source of PSNS fibres?

Answer 10

brainstem and s2-s4 lateral horn

Question 11

what does CNX target (autonomic)

Answer 11

thoracic viscera and abdo until left third of transverse column

Question 12

what does CNIX target autonomic

Answer 12

parotid gland

Question 13

what does CNVII target autonomic

Answer 13

submandibular, sublingual, lacrimal glands

Question 14

what does CNIII target

Answer 14

iris

Question 15

where is the only parasympathetic splanchnic nerve

Answer 15

pelvic
arise from s2-24

Question 16

what are the features of autonomic plexi

Answer 16

• contain both symp and PS fibres
• close to or embedded in target
• named after target

Question 17

cardiac plexus nerve supply

Answer 17

PS: CNX
Symp: T1-T4

Question 18

Pulmonary plexus nerve supply

Answer 18

PS: CNX
Symp: T1-T4

Question 19

Esophageal plexus nerve supply

Answer 19

PS: CNX
Symp: T1-T4

Question 20

Celiac plexus& ganglia

Answer 20

form around celiac artery, supplies liver, pancreas, spleen, stomach

PS fibres: CNX
Symp: T5-L2

Question 21

Sup. Mesenteric plexus& ganglia

Answer 21

supplies S and L intestine until L third of transverse column.

PS fibres: CNX
Symp: T5-L2

Question 22

inferior mesenteric plexus& ganglia

Answer 22

supplies rest of L intestine

PS fibres: S2-S4 (pelvic splanchnic)
Symp: T5-L2

Question 23

where do upper and lower limbs receive parasympathetic input from

Answer 23

NOWHERE! they dont receive any