Anatomy of the GI Part 2 Flashcards
What is the vertebral level of the oesophageal hiatus?
T10
What structures go through the oesophageal opening?
Oesophagus, vagus nerve,left inferior phrenic vessels and the oesophageal arteries (from the left gastric arteries)
What are the two orifices of the stomach?
Cardiac opening and pyloric opening
What are the two curvatures of the stomach?
Greater and lesser curvatures
What are the two surfaces of the stomach?
Anterior and posterior
What is the pyloric sphincter?
A thickened ring of muscles
What is the function of the pyloric sphincter?
To control movement of contents from the stomach to the duodenum
What are the rugae formed from?
The mucosal layer of the stomach
In which parts of the stomach are the rugae most apparent?
Body and antrum
What structures form the stomach bed (posterior wall of the lesser sac)
Left dome of the diaphragm, pancreas, spleen, L. kidney, L. adrenal gland, colon, mesocolon and splenic artery
What is the effect of increased vagal stimulation on the pylorus?
It stimulates opening of the pylorus (relaxation)
Which group of lymph nodes will the 4 primary nodes eventually drain into?
Coeliac group
What is the effect of increased vagal stimulation on gastric secretion?
Stimulation of watery secretion
What are the three parts of the small intestine?
Duodenum, jejunum and Ileum
Which part of the small intestine receives the opening of the bile and pancreatic duct?
Duodenum (2nd part)
How is the duodenum peritonised?
Retroperitoneal
How is the jejunum peritonised?
Intraperitoneal
How is the ileum peritonised?
Intraperitoneal
What are the characteristics of the jejunum?
Deep red in colour, thick/heavy wall, greater vascularity, long vasa recta, large loops of arcades, little fat in the mesentery and large/tall circular folds
What are the characteristics of the ileum?
Pale pink, thin/light wall, little vascularity, short vasa recta, short loops of arcades, more fat in the mesentery and no circular folds
Which part of the autonomic nervous system stimulates the reduction of secretions and motility of the intestine and acts as a vasoconstrictor?
Sympathetic
How is the large intestine structure different to the small intestine?
Shorter/wider, no circular folds, microvilli and bands of muscle
How is the caecum peritonised?
Intraperitoneal
How is the ascending colon peritonised?
Retroperitoneal
How is the transverse colon peritonised?
Retroperitoneal
How is the descending colon peritonised?
Retroperitoneal
How is the sigmoid colon peritonised?
Intraperitoneal
In which abdominal region is the caecum and appendix located?
Right Iliac fossa
What is McBurney’s point?
1/3 of the distance from the anterior superior iliac sine to the umbilicus - most tender point in appendicitis as it is the common location of the base of the appendix
What is the role of the pelvic floor in maintaining faecal continence?
The muscles surround the anal canal and maintain tone keeping it closed
What other structures (besides the pelvic floor) are involved in faecal continence?
Internal and external sphincter
Which omentum are the hepatoduodenal and hepatogastric ligaments a part of?
Lesser omentum
What is the falciform ligament?
Ligament that attaches the liver to the anterior wall and separates the right and left lobes