Extra Anatomy Flashcards from Gray's Anatomy
What does the costal margin separate?
The abdominal wall from the thoracic wall
What separates the anterior abdominal wall from the thigh?
Inguinal ligament
What separates the posterior abdominal wall from the gluteal region?
Iliac crest
What abdominal viscera are protected by the thoracic cavity?
Those that project above the costal margin:
- Stomach
- Liver
- Spleen
- Kidneys
- Abdominal esophagus
How high can the diaphragm get during forceful expiration?
4th ICS
Surface projection of deep inguinal ring?
Superior to inguinal ligament, midway between the ASIS and pubic symphysis
Where can the pulse of the femoral artery be felt?
Inferior to inguinal ligament, midway between the ASIS and pubic symphysis
Surface projection of superficial inguinal ring in men?
Follow the spermatic cord superiorly to the lower abdominal wall
Surface projection of superficial inguinal ring in women?
The pubic tubercle can be palpated and the ring is superior and lateral to it
What 6 things are visualized at the L1 transverse plane?
- The beginning and upper limit of the end of the duodenum
- The hila of the kidneys
- The neck of the pancreas
- Celiac trunk originates at upper edge of L1
- SMA originates at lower edge of L1
- Left and right colic flexures are “close”
What is the L1 transverse plane midway in between?
Between jugular notch and pubic symphysis
Rib level of L1 transverse plane?
9th costal cartilage lower edge
Surface projection of the spleen?
Superior edge of rib 9 to superior edge of rib 11and follows the contour of rib 10 and horizontally from midaxillary line to superior pole of left kidney
2 groups of retroperitoneal lymph nodes clinically? Describe each.
- Pre-aortic lymph node group drains lymph from the embryological midline structures, such as the liver, bowel, and pancreas
- Para-aortic lymph node group, on either side of the aorta, drain lymph from bilateral structures, such as the kidneys and adrenal glands, and organs embryologically derived from the posterior abdominal wall, including the ovaries and the testes
2 other names for para-aortic lymph nodes?
Lateral aortic or lumbar nodes
Do the testes drain to the inguinal lymph nodes?
NOPE
Procedure to access retroperitoneal lymph nodes, for example during surgical removal due to testicular cancer?
- Lateral paramedian incision in the midclavicular line
- 3 layers of the anterolateral abdominal wall (external oblique, internal oblique, and transversus abdominis) are opened and the transversalis fascia is divided
- Surgeon gently pushes the parietal peritoneum toward the midline, which moves the intraabdominal contents and allows a clear view of the retroperitoneal structures.
- On the left, the para-aortic lymph node group is easily demonstrated, with a clear view of the abdominal aorta and kidney. On the right the IVC is demonstrated and has to be retracted to access the right para-aortic lymph node chain
Does the peritoneal cavity need to be entered to remove retroperitoneal lymph nodes?
NOPE
What would happen if one of the nerves to the muscles of the anterior abdominal wall was severed?
Atrophy of the muscle and asymmetrical proportions of the anterior abdominal wall
What does the presence of a main and accessory pancreatic duct reflect?
The embryological origin of the pancreas from dorsal and ventral buds from the foregut
What could cause pleural effusions to become ascites and vice versa?
Diaphragmatic hernias
2 types of diaphragmatic hernias? Describe each.
- Morgani’s hernia: failed point of fusion between the xiphoid process and the costal margins on the right
- Bochdalek’s hernia: failed point of fusion through an opening on the left when the pleuroperitoneal membrane fails to close the pericardioperitoneal canal
What is a hiatus hernia? Consequence?
At the level of the esophageal hiatus, the diaphragm may be lax, allowing the fundus of the stomach to herniate into the posterior mediastinum => typically causes symptoms of acid reflux with ulceration
What does the ventral embryonic pancreas form?
- Part of the head
2. Uncinate process
What does the dorsal embryonic pancreas form?
- Most of head
- Neck
- Body
What is polyhydramnios? What is it caused by?
Fetus not swallowing enough amniotic fluids because of annular pancreas around duodenum causing increase in overall volume of the amniotic sac
Does the hindgut include the anal canal?
Its upper part only
What parts of the GIT become secondarily retroperitoneal during development?
- Ascending colon
Around what axis does volvulus of the small intestine occur?
SMA
What is included in the mesentery of the small intestine?
Arteries, veins, nerves, and lymphatics that supply the jejunum and ileum
Describe the lymph drainage of the GIT.
Pre-aortic lymph nodes at the origins of the three anterior branches of the abdominal aorta, which supply these structures: celiac, superior mesenteric, and inferior mesenteric groups of pre-aortic lymph nodes all draining superiorly to the cisterna chyli
Through what diaphragmatic opening do lymphatics travel?
Aortic hiatus
What parts of the abdomen do not drain into the thoracic duct? Where do they drain instead?
Upper abdominal wall to left and right subclavian trunks
Left trunk to thoracic duct
Right trunk to right lymphatic duct
What anterior thoracic wall muscle is at the same level as the transversus abdominis?
Innermost intercostals
What is a sign that visceral structures are in pain? Implication?
Guarding of the anterior abdominal wall = involuntary muscle spasms
Palpation should we done with warm hands because cold hands can cause these reflexes as well
When cutting through muscle, it is best to do so in the direction of the muscle fibers. What is an exception to this?
Rectus abdominis because of the tendinous intersections
Effect of cutting nerves to a muscle?
Muscle paralysis
What are median incisions used for? Good and bad sides?
Exploratory procedures
Good: bloodless
Bad: risk of necrosis
What are gridiron incisions used for? Other name? Describe it. What nerve do you need to be careful with?
= Muscle-splitting incisions
Often used for appendectomy: external oblique aponeurosis is incised and retracted => aponeuroses + muscle of internal oblique and transversus are then incised along the course of the fibers and retracted
Iliohypogastric nerve needs to be preserved
Most common abdominal organ to rupture? Treatment?
Spleen
Surgical removal to avoid death by blood loss
If a person is obese, and we want to describe the pain they are feeling by abdominal quadrant, how do we do this since they transumbilical plane will probably be lower than L3/L4?
Use the 9 regions not quadrants