L1: Intro to GIT Physiology Flashcards

1
Q

What are each of these layers of the GIT

A
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2
Q
A
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3
Q

Outmost layer when tissue is outside the peritoneum (e.g. upper Oesophagus)?

A

Adventitia

Loose Connective Tissue

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4
Q

Outmost layer when tissue is within the peritoneal cavity (e.g. Stomach)

A

Serosa

lubrication function

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5
Q

Innervation of the GIT?

A

EXTRINSIC (Autonomic nervous system)

  • Sympathetic Nervous System
  • Parasympathetic Nervous system

INTRINSIC (Enteric Nervous System)

  • Myenteric Nerve Plexus (Auberbach’s Plexus)
  • Submucosal Nerve Plexus (Meissner’s Plexus)
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6
Q

Location/Role of Meissner’s Plexus?

Also known as?

A

Located in Submucosa (Regulates Secretion/Blood Flow)

Submucosal Plexus

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7
Q

Location/Role of Auerbach’s Plexus?

Also known as?

A

Located in Muscularis externa. Between longitudinal and circular layers!! (Regulates Motility)

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8
Q

Distance of Ganglia from Target
(Sympathetic vs. Parasympathetic)

A
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9
Q

Differing roles of Submucosal Plexus and Myenteric Plexus?

A

Submucosal = Meissner’s

Myenteric = Auerbach’s

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10
Q

Sphincter muscles receive basal tone from ________ fibers

A

Sympathetic FIbers

Synmpathetic Innervation maintains continence

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11
Q

Salivary Glands are under what kind of control?

A

Neural

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12
Q

Stomach is under what kind of control?

A

Neural and Hormonal

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13
Q

Pancreas is under what kind of control?

A

Neural and Hormonal

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14
Q

Parasympathetic vs. Sympathetic Nervous System in Digestion?

A

Parasympathetic Nervous System in Digestion:

  • Secretory Cells: Chrolinergic, M1 (Gastric Acid), M3
  • Motility: Stimulatory (M1/M3) (Long/Short Reflexes)

Sympathetic Nervous System in Digestion:

  • Secretory Cells: Alpha Adrenoreceptors (Vasoconstriction)
  • Motility: Inhibitory (Sphincters are exception (maintains continence))
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