6- Abdomen & Pelvic MSQs Only (2) Flashcards
1- The transversalis fascia contributes to which of the following?
Deep inguinal ring
The internal spermatic fascia (derived from transversalis fascia) invests:
Ductus deferens
Testicular vessels
The principal outpouching of the transversalis fascia is the internal spermatic fascia. The mouth of the outpouching is the deep inguinal ring.
2- Which of the following nerves is the primary source of innervation to the anterior scrotal skin?
llioinguinal nerve
The pudendal nerve may innervate the posterior skin of the scrotum. The anterior innervation of the scrotum is primarily provided by the ilioinguinal nerve. The genital branch of the genitofemoral nerve provides a smaller contribution.
3- Which of the following statements relating to the gallbladder is untrue?
Cholecystokinin causes relaxation of the gallbladder
CCK causes gallbladder contraction.
4-The inferior aspect of the vagina drains to which of the following lymph node groups?
Superficial inguinal nodes
5- Which of the following options in relation to the liver is true?
-Ligamentum venosum is an anterior relation of the liver
-The portal triad comprises the hepatic artery, hepatic vein and tributary of the bile duct
-The liver is completely covered by peritoneum
-There are no nerves within the porta hepatis
-The caudate lobe is superior to the porta hepatis( Right)
‘VC goes with VC’
The ligamentun Venosum and Caudate is on same side as Vena Cava [posterior].
Ligamentum venosum is posterior to the liver. The portal triad contains the portal vein rather than the hepatic vein. There is the ‘bare area of the liver’ created by a void due to the coronary ligament layers being widely separated. There are sympathetic and parasympathetic nerves in the porta hepatis.
6- An 22 year old soldier is shot in the abdomen and amongst his various injuries is a major
disruption to the abdominal aorta. There is torrential haemorrhage and the surgeons decide to control the aorta by placement of a vascular clamp immediately inferior to the diaphragm. Which of the following vessels may be injured in this maneouvre?
Inferior phrenic arteries
As the first branches of the abdominal aorta the inferior phrenic arteries are at greatest risk. The superior phrenic arteries lie in the thorax. The potential space at the level of the diaphragmatic hiatus is a potentially useful site for aortic occlusion. However, leaving the clamp applied for more than about 10 -15 minutes usually leads to poor outcomes.
7- A 25 year old man is being catheterised, prior to a surgical procedure. As the catheter enters the prostatic urethra which of the following changes will occur?
Resistance will decrease
The prostatic urethra is much wider than the membranous urethra and therefore resistance will decrease. The prostatic urethra is inclined superiorly.
8- A 73 year old lady is admitted with right iliac fossa pain. A plain abdominal x-ray is taken and the caecal diameter measured. Which of the following caecal diameters is pathological?
10cm
8 cm is still within normal limits. However, caecal diameters of 9 and 10 are pathological and should prompt further investigation.
9- A 78 year old man develops a carcinoma of the scrotum. To which of the following lymph node groups may the tumour initially metastasise?
Inguinal
The scrotum is drained by the inguinal nodes.
10- A 28 year old man is undergoing an appendicectomy. The external oblique aponeurosis is incised and the underlying muscle split in the line of its fibres. At the medial edge of the wound is a toughfibrous structure. Entry to this structure will most likely encounter which of the following?
Rectus abdominis
This structure will be the rectus sheath and when entered the rectus abdominis muscle will be encountered.
12- A 35 year old man presents to the surgical clinic with a suspected direct inguinal hernia. These will pass through Hesselbach’s triangle. Which of the following forms the medial edge of this structure?
Rectus abdominis muscle
Direct inguinal hernias pass through Hesselbachs triangle (although this is of minimal clinical significance!). Its medial boundary is the rectus muscle.
11- The following statements regarding the rectus abdominis muscle are true except:
It runs from the symphysis pubis to the xiphoid process
Its nerve supply is from the ventral rami of the lower 6 thoracic nerves
It has collateral supply from both superior and inferior epigastric vessels
It lies in a muscular aponeurosis throughout its length(Right)
Rectus abdominis
· Arises from the pubis.
. Inserts into 5th, 6th, 7th costal cartilages.
. The muscle lies in the rectal sheath, which also contains the superior and inferior epigastric artery and vein.
· Action: flexion of thoracic and lumbar spine.
· Nerve supply: anterior primary rami of T7-12.
The aponeurosis is deficient below the arcuate line.
13- A 56 year old man is undergoing an anterior resection for a carcinoma of the rectum. Which of the structures below is least likely to be encountered during the mobilisation of the anterior rectum?
Middle sacral artery
With the exception of the middle sacral artery all of the other structures lie anterior to the rectum. They may all be palpated during digital rectal examination.
14- Where are accessory spleens not found?
Ureter
Accessory spleens
- 10% population
- 1 cm size
- locations: hilum of the spleen, tail of the pancreas, along the splenic vessels, in the gastrosplenic ligament, the splenorenal ligament, the walls of the stomach or intestines, the greater omentum, the mesentery, the gonads
15- A 42 year old woman is due to undergo a left nephroureterectomy for a transitional cell carcinoma involving the ureter. Which of the following structures is not related to the left ureter?
Round ligament of the uterus
The ureter is not related to the round ligament of the uterus, it is related to the broad ligament and is within 1.5cm of the supravaginal part of the cervix.
16- A 45 year old man is undergoing a left hemicolectomy. As the surgeons mobilise the left colon they identify a tubular structure lying at the inferior aspect of psoas major. What is it most likely to be?
Left ureter
The left ureter lies posterior to the left colon. The sigmoid colon and upper rectum may be more closely related to the iliac vessels. These are not typically found above L4.
17- Which of the following structures is not at the level of the transpyloric plane?
Cardioesophageal junction
Cardiooesophageal junction level = T11
A knowledge of this anatomic level is commonly tested.
The oesophagus extends from C6 (the lower border of the cricoid cartilage) to T11 at the cardioesophageal junction. Note that in the neonate the oesophagus extends from C4 or C5 to T9.
18- A 63 year old man is due to undergo a splenectomy. Which splenic structure lies most posteriorly?
Lienorenal ligament
The lienorenal ligament lies most posteriorly. The antero-lateral connection is via the phrenicocolic ligament. Anteriorly the gastro splenic ligament. These structures condense around the vessels at the splenic hilum.
19- During embryological development, which of the following represent the correct origin of the pancreas?
Ventral and dorsal endodermal outgrowths of the duodenum
The pancreas develops from a ventral and dorsal endodermal outgrowth of the duodenum. The ventral arises close to, or in common with the hepatic diverticulum, and the larger, dorsal outgrowth arises slightly cranial to the ventral extending into the mesoduodenum and
mesogastrium. When the buds eventually fuse the duct of the ventral rudiment becomes the main pancreatic duct.
20- A 20 year old man undergoes an open appendicectomy performed via a lanz incision. This surgeon places the incision on a level of the anterior superior iliac spine in an attempt to improve cosmesis. During the procedure the appendix is found to be retrocaecal and the incision is extended laterally. Which of the following nerves is at greatest risk of injury?
llioinguinal
21- A 45 year old man presents with bilateral inguinal hernias. The surgical team decide to repair these laparoscopically through an extraperitoneal approach. Through an infraumbilical incision the surgeons displace the inferior aspect of the rectus abdominis muscle anteriorly and place a prosthetic mesh into the area to repair the hernias. Which structure will lie posterior to the mesh?
Peritoneum
During a TEP repair of inguinal hernia the only structure to lie posterior to the mesh is peritoneum. The question is really only asking which structure lies posterior to the rectus abdominis muscle. Since this region is below the arcuate line, the transversalis fascia andperitoneum lie posterior to it. Bucks fascia lies in the penis.
22- How many unpaired branches leave the abdominal aorta to supply the abdominal viscera?
Three
There are three unpaired branches to the abdominal viscera. These include the coeliac axis, the SMA and IMA. Branches to the adrenals, renal arteries and gonadal vessels are paired. The fourth unpaired branch of the abdominal aorta, the median sacral artery, does not directly supply the abdominal viscera.
23- A 60 year old female is undergoing a Whipples procedure for adenocarcinoma of the pancreas. As the surgeons begin to mobilise the pancreatic head they identify a large vessel passing inferiorly over the anterior aspect of the uncinate process. What is it likely to be?
Superior mesenteric artery
The superior mesenteric artery arises from the aorta and passes anterior to the lower part of the pancreas. Invasion of this structure is a relative contra indication to resectional surgery.
24- A 56 year old man is undergoing a radical nephrectomy via a posterior approach. Which of the following structures is most likely to be encountered during the operative approach?
12th rib
The 11th and 12th ribs lie posterior to the kidneys and may be encountered during a posterior approach. A pneumothorax is a recognised complication of this type of surgery.