Oesophagus,Stomach, Small and Large intestines, Annus Flashcards
Where is the oesophagus
Located at the back of mediastinum, behind the trachea, in front of vertebrea.
What type of tissue is the oesophagus
Fibromuscular
Where does the oesophagus run
Behind the heart, through the diaphragm into the stomach
Length of the oesophagus
~25cm
What is the hole that the oesophagus passes through the diaphragmatic perforation
Oesophageal hiatus
Function of upper oesophageal sphincter
To close oesophagus when food is not being swallowed
Function of lower oesophageal sphincter
To close oesophagus when food is not being swallowed
Location of lower oesophageal sphincter
Opening to stomach
Regions of stomach
- cardiac region
- fundic region
- body of stomach
- pyloric region
Function of cardiac region
where to contents of oesophagus empty into
Function of pylorus region
It facilitates emptying contents into small intestine
What are the two sphincters that keep contents of stomach contained
Lower oesophageal sphincter
pyloric sphincter
Function of stomach
2nd phase of digestion following mastication, secretes digestive enzymes and gastric acid
What allows the stomach to move/enlarge
Gastric rugae
Location of stomach
Between oesophagus and small intestine
What is digested food known as
Chyme
location of small intestine
between stomach and large intestine
Function of small intestine
Food absorption
Length of small intestine
~3-5meteres
What is the small intestine comprised of
The duodenum, jejenum, and ileum
What suspends the jejnum and ileum in the small intestine
mesentery
Function of the mesentery
To allow arteries, veins lymph vessels and nerves to pass through.
Function of duodenum
Preparation for absorption, receives gastric chyme from stomach + digestive enzymes from pancreas + bile from liver
Location of duodenum
surrounds head of pancreas, and under liver
Length of jejunum
~2.5metres (40% length of small intestine)
Location of jejunum
midsection of small intestine, connecting duodenum and ileum.
Function of jejunum
Absorption of digestion products into bloodstream
What products does the jejunum absorb
amino acids, sugars, fatty acids
Length of ileum
~3metres (60% length of small intestine)
Location of ileum
At the end of small intestine
What does the ileum join
It joins the cecum of large intestine at ileocecal junction
Function of ileum
absorbs mainly vitamin B12 and bile acids and any remaining nutrients
Parts of Large intestines
cecum appendix ascending colon transverse colon descending colon sigmoid rectum anal canal
What is the large intestine commonly known as
The colon
Length of large intestine
~1.5metres
Location of large intestine
End of gastrointestinal tract
Function of large intestine
absorption of water, and defecation of waste (faeces)
Region of cecum
Right iliac region of pelvis
What type of organ is the appendix
vestigial organ
Connection of transverse colon
hangs off stomach, attached via greater omentum, connected to posterior abdominal wall via mesentery
Location of taenia coli
run length of large intestine
What is the taenia coli
three bands of longitudinal smooth muscle that keeps the bowel in place and causes it to be saculated
What is haustra
bulges caused by contraction of taeniae coli
Location of descending colon
starts from splenic flexure to the start of sigmoid colon
Function of descending colon
To store faeces which will be emptied
Location of sigmoid colon
after descending colon to the start of rectum
Function of sigmoid colon
contracts to increase pressure inside colon which moves stool into rectum
Location of rectum
End of large intestine
Function of rectum
holds formed faeces awaiting elimination via defecation