Lymph drainage, nerve supply, and structural features of the GI tract (Dave's notes) Flashcards
What is the first stage of gut lymphatic drainage? What occurs to this in the terminal ilium?
Lymphoid follicles in the mucous membrane. These become aggregated in the terminal ilium (AMB???) as Peyer’s patches
What are the five stages of gut lymphatic drainage?
- Lymphoid follicles
- Peritoneum as juxutaintestinal nodes (SI) and paracolic nodes (LI)????
- Tracks along main blood vessels of supply
- Collects at the pre-aortic groups at the base of the CT, SMA and IMA
- Drains upwards eventually to the cisterna chyli
All parts of the gut are supplied by ……… and ……… nerves
sympathetic and parasympathetic
Sympathetic nerves are….. and their action is ……..
post ganglionic - inhibitory
Parasympathetic nerves are ….. and their action is ….
preganglionic - excitatory
What structures do the sympathetic and parasympathetic nerves travel with?
The arterial supply to the gut
What additional nerve supply exists in the gut?
The myenteric or Auerbach’s plexus is between the two muscle layers of the gut
The submucous or Meissners plexus is submucosal
These function without extrinsic nerve supply
From whence is the epithelial lining of the gut derived?
The gut can be described as what sort of tube with what coverings?
A muscular tube with a mucous membrane lining and a peritoneum covering
The muscular layers of the gut consist of what?
An inner circular and an outer longitudinal later. The upper one third of the oesophagus is striated muscle that is gradually replaced by visceral muscle
The mucous membrane consists of what three layers?
The lamina propria (connective tissue layer)
The muscularis mucosa (thin layer of visceral muscle)