Formation of alimentary system, liver and pancreas. Flashcards
Accessory organs of the guts
Salivary glands
Liver and gall bladder
Pancreas
How does the oral cavity develop?
Mouth parts from branchial arches
Also ear, head and neck structures.
Development of the gut?
Develops as endodermal tube.
Splanchnic Mesoderm surrounds the endoderm and firms muscle and connective tissue.
Accessory organs form as gut develops.
Explain transverse section? - week 5
Pancreas develops as a dorsal and ventral pancreatic buds
Endoderm origin
Connected to gut by pancreatic duct.
Pancreatic bud converge to form pancreatic organ with central duct, lined with glands.
What does dorsal pancreatic bud form
endocrine pancreas - vascularised
What does the ventral pancreatic bud form?
exocrine pancreas.
Transverse section - week 6
Dorsal mesentery (mesoderm origin) coelom.
Dorsal pancreatic bud elongated and grows around ventral bud to form pancreas with exocrine glands and endocrine islets.
What is the 4 layers of gut wall composed of?
- Mucosa - lines gut lumen
- Submucosa - thick connective tissue
- Muscularis externa - Muscle
- Serosa - Outer connective tissue
Liver and develop
Largest peritoneal coelom organ.
Glycogen storage and glucose homeostasis.
Albumin for blood plasma.
Connected to gut by hepatic and cystic duct which form co-bile duct.
Develops from ventral hepatic bud from foregut endoderm.
Pancreas and develop?
Located duodenum
Site of glucose homeostasis
Gut hormone secretion site.
Enzyme secretion site.
Connected to gut by pancreatic duct.
Develops from dorsal and ventral pancreatic bud - endoderm origin.
Role of exocrine pancreas
Secretes digestive enzymes. Acini
Role of endocrine pancreas
Metabolic hormone secretions and islet cells.
Organs that develop from gut but not involved in nutrient extraction
Lung
Thyroid
How would you describe the gut?
Continuous tube with specialised regions for nutrient extraction and fluid balance.
