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Biology 323Human Anatomy for Biology MajorsLecture 13Dr. Stuart S. Sumida
Gut Tube: Development, Structure, Function
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1. Implications of Gut DevelopmentForegut DevelopmentMidgut DevelopmentHindgut Development
2. Circulation – Part I
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Dorsal vs. Ventral Mesentery Components
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Early Development of the Stomach
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Continued Development of the Stomach
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Rotation of the Foregut
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Development of diverticula of the foregut
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PancreasDevelopment
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Development of Diverticula of Foregut
• Hepatic Diverticulum
• Pancreas originally two separate lobes (ventral part of hepatic diverticulum, dorsal independent.
• Rotation brings dorsal (tail) and ventral components of pancreas together.
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Development of Diverticula of Foregut
• Hepatic Diverticulum
• Pancreas originally two separate lobes (ventral part of hepatic diverticulum, dorsal independent.
• Rotation brings dorsal (tail) and ventral components of pancreas together.
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Development of Diverticula of Foregut
• Hepatic Diverticulum
• Pancreas originally two separate lobes (ventral part of hepatic diverticulum, dorsal independent.
• Rotation brings dorsal (tail) and ventral components of pancreas together.
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Development of Diverticula of Foregut
• Hepatic Diverticulum
• Pancreas originally two separate lobes (ventral part of hepatic diverticulum, dorsal independent.
• Rotation brings dorsal (tail) and ventral components of pancreas together.
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HepaticPortal Vein
Bile Duct
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Liver Stomach
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Liver:
Dorsal View
Ventral View
Ligamentum teres (= old ductus venosus)
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Foregut - Neurovascular Service:
Unpaired Branch of Abdominal Aorta: Celiac Artery
Unpaired Tributary of Hepatic Portal Vein: Splenic Vein
Sympathetic Nerve: Greater Splanchnic NerveSympathetic Nerve Segmental Levels: T5-9Sympathetic Ganglion: Celiac Ganglion
Parasympathetic Nerve: Vagus Nerve (CN – X)
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1. Implications of Gut DevelopmentForegut DevelopmentMidgut DevelopmentHindgut Development
2. Circulation – Part I
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Dorsal vs. Ventral Mesentery Components
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“Repackaging” of the Midgut
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Retroperitonealcomponents of abdominal cavity
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Midgut - Neurovascular Service:
Unpaired Branch of Abdominal Aorta: Superior Mesenteric Artery
Unpaired Tributary of Hepatic Portal Vein: Superior Mesenteric Vein
Sympathetic Nerve: Lesser Splanchnic NerveSympathetic Nerve Segmental Levels: T10-11Sympathetic Ganglion: Superior Mesenteric Ganglion
Parasympathetic Nerve: Vagus Nerve (CN – X)
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1. Implications of Gut DevelopmentForegut DevelopmentMidgut DevelopmentHindgut Development
2. Circulation – Part I
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Review of Retroperitonealcomponents of abdominal cavity
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Innervation of Bladder
Sympathetic: predominantly L1-2 via hypogastric plexus
Parasympathetic: S2-4 (as you would expect of a hindgut derivative).
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Developing
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Hepatic Portal Vein and ItsTributaries
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Sympathetic Supply of the Abdominal Gut
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Parasympathetic Supply to the Hindgut: S2-4)
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Hindgut - Neurovascular Service:
Unpaired Branch of Abdominal Aorta: Inferior Mesenteric Artery
Unpaired Tributary of Hepatic Portal Vein: Inferior Mesenteric Vein
Sympathetic Nerve: Least Splanchnic Nerve + Lumbar splanchnics
Sympathetic Nerve Segmental Levels: T12, L1(2)Sympathetic Ganglion: Superior Mesenteric Ganglion
Parasympathetic Nerve: Pelvic Outflow, S2-4
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Foregut, Midgut, & HindgutSummary
Embryonic Gut Boundaries Sympathetic nerve
Levels
Foregut Through first ½ of duodenum
Greater Splanchnic
T5-9
Midgut 2nd ½ of duodenum through left colic flexure
Lesser Splanchnic
T10-11
Hindgut Left colic flexure to anus
Least Splanchnic + Lumbar splanchnics
T12, L1(2)
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Summary Continued…..Embryonic gut
Preaortic ganglia
Arteries of Abdominal aorta
Hepatic portal vein
Parasymp. innervation
Foregut Celiac ganglion
Celiac artery Splenic vein Vagus Nerve(X)
Midgut Superior mesentericganglion
Superior mesentericartery
Superior mesenteric vein
Vagus Nerve(X)
Hindgut Inferiormesentericganglion
Inferior mesenteric artery
Inferiormesentericvein
Sacral Outflow(S1-S4)