L16: The Enteric Nervous System Flashcards

1
Q

Which nervous system is the enteric NS part of

A

Autonomic NS

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2
Q

Is the enteric nervous system part of the intrinsic or extrinsic innervation of the GIT

A

Intrinsic innervation

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3
Q

What are the 2 plexuses of the enteric nervous system

A

Myenteric plexus

Submucosal plexus

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4
Q

Which 2 muscle layers is the submucosal plexus found between

A

Mucosa and circular muscle

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5
Q

Which 2 layers is the myenteric plexus found between

A

Circular muscle and longitudinal muscle

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6
Q

Which receptors are the afferent sensory neurones associated with

A

Mechanoreceptors

Chemoreceptors

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7
Q

What does mechanoreceptors detect

A

Pressure

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8
Q

What does chemoreceptors detect

A

Chemical

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9
Q

What are the effectors of the enteric NS

A

Motor

Secretory

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10
Q

What do enteric reflexes do

A

Motility
Secretion
Blood flow to the gut

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11
Q

Give an example of a motor reflex

A

Peristalsis

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12
Q

What does the myenteric plexus control

A

Smooth muscle

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13
Q

Describe the process involved in initiating the myenteric plexus

A

1) Bolus is detected in the lumen
2) Excitatory pathway is lead from afferent sensory neurones to interneurones and efferents.
3) Git contracts behind the bolus
4) Relaxation in front of the bolus by an inhibitory pathway

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14
Q

What does the submucosal plexus control

A

Secretory cells

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15
Q

Describe the process involved in the submucosal plexus

A

1) mechano/chemoreceptors detect distension and chemical
2) submucosal plexus is inactivated
3) this leads to increase in mucous, enzymes and acid

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16
Q

Which plexus is involved in the control of blood flow

A

Myenteric

Submucosal

17
Q

Whihc neurotransmitters from the efferent neurone control blood flow

A

Vasoactive neurotransmitters

18
Q

What is Chaga’s disease

A

Parasites get into blood and cause the death of the enteric NS

19
Q

What is achalasia

A

An autoimmune disease of the gastro-oesophageal sphincter

20
Q

What is hirschprung’s disease

A

Mega colon due to the absence of the ENS

21
Q

Which main drugs affect the ENS

A

Opioids

22
Q

What are the good effects of opioids

A

Reduce diarrhoea

23
Q

What is the the bad side effects of opopds

A

Constipation