Gastrointestinal Flashcards
Name the four quadrants of the abdomen
- Right upper quadrant 2. Left upper quadrant 3. Right lower quadrant 4. Left lower quadrant
What is the name of the vertical imaginary line splitting the quadrants of the abdomen?
The median line
What is the name of the horizontal imaginary line that splits the quadrants of the abdomen?
The transumbilical line
Name the nine regions of the abdomen
Top row from right to left- right hypchondriac, epigastric, left hypochondriac Middle from right to left- right lateral, umbilical, left lateral Bottom from right to left- right inguinal, pubic, left inguinal
Name the imaginary vertical lines splitting the nine regions of the abdomen
The right and left midclavicular lines
Name the imaginary horizontal lines splitting the nine regions of the abdomen
The subcostal and trans-tubercular lines
What is the action of the external oblique muscle?
Compressed and supports the abdominal viscera, also flexes and rotated trunk
What is the action of the internal oblique muscle?
Compressed and supports the abdominal viscera, also flexes and rotated trunk
What is the action of the transversus abdominis muscle?
Compresses and shortens the abdominal viscera
What is the action of the rectus abdominis muscle?
Flexes trunk, compresses and shortens abdominal viscera, also stabilises and controls the tilt of the pelvis
What is the innervation of the external oblique and rectus abdominis muscles?
The thoraco-abdominal and sub-costal nerves
What is the innervation of the internal oblique and transversus abdominis muscles?
The thoraco-abdominal, subcostal and first lumbar nerves
What name is given to the group of aponeuroses that closes the rectus abdominis?
The rectus sheath
The aponeuroses of which muscles make up the rectus sheath?
The external oblique, the internal oblique and the transversus abdominis
How does the rectus sheath differ above and below the umbilicus?
Above the umbilicus- aponeurosis posterior to rectus abdominis Below the umbilicus- aponeurosis anterior to rectus abdominis
Which thoracic spinal segments innervate the anterior abdominal wall?
The ventral rami of T7-T12
During what developmental process is the inguinal canal formed?
During relocation of the gonads
What are the two bony attachments of the inguinal canal?
The anterior iliac spins and the pubic tubercle of the hip bone
What makes up the anterior wall of the inguinal canal?
The aponeurosis of external oblique
What makes up the posterior wall of the inguinal canal
The transversus fascia
What forms the roof of the inguinal canal?
The rectus sheath
What forms the floor of the inguinal canal?
The inguinal ligament
What is the name of the two openings of the inguinal canal?
The deep and superficial inguinal rings
What is the relationship of the deep inguinal ring to the inferior epigastric vessels?
The ring lies lateral to the vessels
Where does the superficial inguinal ring lie in relation to the pubic tubercle?
It lies superolaterally
What are the contents of the inguinal canal in males?
The spermatic cord, vessels and the ilio-inguinal nerve
What is the contents of the inguinal canal in females?
The ligament of the uterus, vessels and the ilio-inguinal canal
What are the four layers of the gastrointestinal tract lining?
The mucosa, submucosa, muscularis propria and the serosa/adventitia
What are the three layers of the mucosa of the GI tract lining?
The epithelium, the lamina propria and the muscularis mucosae
When is the outermost layer of the GI tract lining serosa and when is it adventitia?
Inside the peritoneum- serosa Outside the peritoneum- adventitia
What is the peritoneum?
A transparent serous membrane that covers the abdominal wall and organs
What are the two subdivisions of the peritoneum and what does each cover?
The parietal peritoneum covers the abdominal wall and the visceral peritoneum covers the abdominal organs
What is the peritoneal cavity?
A potential space between the two layers of the peritoneum
What are the two major divisions of the peritoneal cavity?
The lesser sac/lesser omentum and the greater sac/greater omentum
Which of the omenta lies anterior to the stomach and which of the omenta lies posterior to the stomach?
The greater omentum lies anterior to the stomach while the lesser omentum lies posterior to the stomach
What is the name of the passage between the two omentum?
The omental or epiploic foramen
What is meant by the term “retroperitoneal”?
An organ that is only covered with peritoneum on their anterior surface, and so firmly attached to the posterior wall
What is meant by the term “intraperitoneal”?
An organ that is completely surrounded in visceral peritoneum
Through what means are intraperitoneal organs attached to the posterior wall?
Through a mesentery
What is present in the peritoneal cavity?
A small amount of fluid
Which layer of the peritoneum is more sensitive to pressure, pain and temperature?
The parietal peritoneum
What are the attachments of the greater omentum?
The greater curvature of the stomach and the transverse colon
What are the attachments of the lesser omentum?
The liver and the lesser curvature of the stomach
What is the innervation of the parietal peritoneum?
T6-L1
What is the innervation of the visceral peritoneum?
Autonomic nerves
What muscles make up the posterior abdominal wall muscles?
Psoas major, iliacus and quadratus lumborum
What are the main vessels of the posterior wall of the abdomen?
The abdominal aorta and the inferior vena cava
What are the nerves in the posterior wall of the abdomen?
The subcostal and lumbar spinal nerves
What organs are present in the posterior wall of the abdomen?
The kidneys, duodenum and colon
What are the three major hiatuses in the diaphragm and at what vertebral level does each occur?
Caval opening (IVC)- T8 Oesophageal hiatus- T10 Aortic hiatus- T12
What are the three main branches of the abdominal aorta that supply the gut tube?
The celiac, inferior mesenteric and superior mesenteric arteries
At what vertebral level does the abdominal aorta divide into two common iliac arteries?
L4
How is the IVC formed in the abdomen?
It passes through the thoracic diaphragm