Abdomen Practice Questions

Q: Suprarenal gland gets its blood supply from all of the following arteries except:

Superior mesenteric artery. ***Superior mesenteric artery*** - The superior mesenteric artery is the chief artery of the **midgut**, supplying structures such as the small intestine, cecum, ascending colon, and part of the transverse colon [2]. - It does **not directly supply** the suprarenal (adrenal) glands. - This is the **correct answer** as it is the artery that does NOT supply the suprarenal gland. *Aorta* - The **abdominal aorta** gives rise to the **middle suprarenal arteries**, which directly supply the suprarenal glands. - These arteries branch off the abdominal aorta at approximately the L1 vertebral level [1]. *Renal artery* - The **renal artery** gives off the **inferior suprarenal arteries**. - These branches contribute to the blood supply of the suprarenal glands from below. *Inferior phrenic artery* - The **inferior phrenic artery** gives rise to the **superior suprarenal arteries**, which are a major blood supply to the suprarenal glands [1]. - These arteries originate from the inferior phrenic artery, which typically arises directly from the aorta just below the aortic hiatus of the diaphragm.

Q: Inferior pancreaticoduodenal artery is a branch of which of the following arteries?

Superior mesenteric artery. ***Superior mesenteric artery*** - The **inferior pancreaticoduodenal artery** is a direct branch of the **superior mesenteric artery (SMA)**. - It supplies the **head of the pancreas** and the **duodenum**, anastomosing with branches from the gastroduodenal artery. *Splenic artery* - The splenic artery is a branch of the **celiac trunk** and primarily supplies the **spleen**, stomach, and pancreas (via pancreatic branches). - It does not give rise to the inferior pancreaticoduodenal artery. *Left gastric artery* - The left gastric artery is a branch of the **celiac trunk** and supplies the **lesser curvature of the stomach** and distal esophagus. - It has no direct connection to the inferior pancreaticoduodenal artery. *Gastroduodenal artery* - The gastroduodenal artery is a branch of the **common hepatic artery** (from the celiac trunk) and gives off the **anterior and posterior superior pancreaticoduodenal arteries**. - While it supplies the head of the pancreas and duodenum, it is not the origin of the inferior pancreaticoduodenal artery, which arises from the SMA.

Q: Superior pancreaticoduodenal artery is a branch of?

Gastroduodenal artery. ***Gastroduodenal artery*** - The **gastroduodenal artery** is a direct branch of the **common hepatic artery** [1], and it gives rise to the **superior pancreaticoduodenal artery**. - This artery is crucial for supplying blood to the **head of the pancreas** and the **duodenum**, forming an anastomosis with the inferior pancreaticoduodenal artery. *Hepatic artery* - The **hepatic artery** (specifically the common hepatic artery) gives rise to the gastroduodenal artery [1], but it does not *directly* give rise to the superior pancreaticoduodenal artery. - The common hepatic artery primarily supplies the **liver**, gallbladder, pylorus, and duodenum [1]. *Splenic artery* - The **splenic artery** is a branch of the celiac trunk that supplies the **spleen**, part of the pancreas, and greater curvature of the stomach via short gastric arteries and the left gastro-omental artery [1]. - It does not directly give rise to the superior pancreaticoduodenal artery. *Inferior mesenteric artery* - The **inferior mesenteric artery** is a major artery that supplies the distal third of the **transverse colon**, descending colon, sigmoid colon, and rectum. - It arises directly from the **abdominal aorta** significantly lower than the celiac trunk branches and is not involved in supplying the pancreas or duodenum directly via the superior pancreaticoduodenal artery.

Q: Which of the following statements about the blood supply of the kidney is NOT true?

Renal artery is a branch of common iliac artery. ***Renal artery is a branch of common iliac artery.*** - The **renal arteries** originate directly from the **abdominal aorta**, not the common iliac arteries. - The common iliac arteries branch subsequently from the **abdominal aorta** lower down to supply the pelvis and lower limbs. *Renal vein drains into IVC* - The **renal veins** are responsible for draining deoxygenated blood from the kidneys and typically empty directly into the **inferior vena cava (IVC)** [1]. - This is a correct anatomical relationship, essential for returning filtered blood to systemic circulation. *Right renal artery passes behind IVC* - The **right renal artery** typically originates from the aorta and passes **posterior to the inferior vena cava (IVC)** to reach the right kidney. - This anatomical arrangement is correct due to the position of the aorta and IVC relative to the kidneys. *Branches of renal artery are end arteries* - The intralobar and interlobar branches of the renal artery are considered **functional end arteries**, meaning they provide the sole blood supply to the kidney segments they perfuse. - This characteristic makes the kidney particularly susceptible to **ischemic damage** if these arteries are occluded, as there is little to no collateral circulation.

Q: Which of the following structures is not related to the third part of the duodenum?

Quadrate lobe of liver. ***Quadrate lobe of liver*** - The **quadrate lobe of the liver** is located on the visceral surface of the liver, bounded by the gallbladder fossa, ligamentum teres, and porta hepatis. [1] - It is anatomically related to the **first part of the duodenum** and the pylorus, but has **no direct relationship** with the retroperitoneal **third part of the duodenum**, which lies at the L3 vertebral level. [2] - The third part of the duodenum is too inferior and posterior to have any relationship with the quadrate lobe. *Superior mesenteric vessels* - The **superior mesenteric artery** and **vein** cross **anteriorly** to the **third part of the duodenum** as it runs horizontally from right to left. - The duodenum passes between the aorta posteriorly and the superior mesenteric vessels anteriorly, creating a potential site for compression (**superior mesenteric artery syndrome**). *Right ureter* - The **right ureter** is a **posterior relation** of the **third part of the duodenum**, as both structures are retroperitoneal. [2] - The ureter descends on the psoas major muscle, passing behind the third part of the duodenum during its course toward the pelvis. *Head of pancreas* - The **head of pancreas**, specifically the **uncinate process**, lies **superior and posterior** to the **third part of the duodenum**. - The uncinate process hooks around posteriorly to the superior mesenteric vessels and has an intimate relationship with the third part of the duodenum.

Q: What is the nerve supply of the cremasteric muscle?

Genital branch of genitofemoral nerve. ***Genital branch of genitofemoral nerve*** - The **genital branch of the genitofemoral nerve** (L1-L2) directly innervates the cremaster muscle, controlling its contraction. - This nerve provides the **efferent (motor) limb** of the **cremasteric reflex**, causing elevation of the testis when the inner thigh is stroked. - The afferent (sensory) limb of this reflex is carried by the ilioinguinal nerve or femoral branch of the genitofemoral nerve. *Pudendal nerve* - The **pudendal nerve** (S2-S4) primarily innervates the perineum and external genitalia, responsible for sensation and motor function of the pelvic floor and sphincters. - It does not supply the cremaster muscle. *Femoral branch of genitofemoral* - The **femoral branch of the genitofemoral nerve** supplies sensation to the skin of the upper anterior thigh. - It provides sensory input (afferent limb) for the cremasteric reflex but does not have motor innervation to the cremaster muscle. *Ilioinguinal nerve* - The **ilioinguinal nerve** (L1) provides sensory innervation to the skin of the upper medial thigh, root of the penis/mons pubis, and parts of the scrotum/labia majora. - While it traverses the inguinal canal and may contribute to the afferent limb of the cremasteric reflex, it does not innervate the cremaster muscle itself.

Q: Which of the following structures does NOT pass through the deep inguinal ring?

Ilioinguinal nerve. The ilioinguinal nerve typically passes through the superficial inguinal ring but does not travel through the deep inguinal ring [1]. It lies in the inguinal canal, superficial to the spermatic cord in males and the round ligament in females [1]. The spermatic cord in males enters the inguinal canal through the deep inguinal ring [2]. It contains structures like the vas deferens, testicular artery, pampiniform plexus, and nerves. The internal spermatic fascia is a covering of the spermatic cord that originates from the transversalis fascia at the deep inguinal ring [2]. In females, the round ligament of the uterus is the homologous structure to the spermatic cord in males, and it passes through the deep inguinal ring to enter the inguinal canal. It helps maintain the anteversion of the uterus.

Q: Sensory nerve supply of gall bladder is through -

Vagus nerve (Cranial Nerve X). ***Vagus nerve (Cranial Nerve X)*** - The **vagus nerve** provides the primary **sensory (visceral afferent) innervation** to the gallbladder, carrying information about distension, contraction, and physiological state. - These **parasympathetic sensory fibers** travel through the vagus nerve to medullary centers, monitoring gallbladder function and participating in reflex arcs. - The vagus nerve is the main pathway for **general sensory innervation** of the gallbladder as per standard anatomical texts. *Celiac plexus (sympathetic fibers)* - The **celiac plexus** contains **sympathetic afferent fibers** that primarily transmit **pain sensation** from the gallbladder, especially during inflammation or biliary colic [1]. - These pain fibers travel via sympathetic pathways to spinal segments **T8-T9**, mediating referred pain to the epigastric region and right upper quadrant [1]. - While important for pain transmission, the celiac plexus is not classified as the primary sensory nerve supply in anatomical nomenclature. *Trigeminal nerve (Cranial Nerve V)* - The **trigeminal nerve** provides **sensory innervation to the face** and motor innervation to muscles of mastication. - It has no role in innervation of abdominal viscera, including the gallbladder. *Facial nerve (Cranial Nerve VII)* - The **facial nerve** controls **facial expression muscles**, provides taste sensation to the anterior two-thirds of the tongue, and supplies parasympathetic fibers to lacrimal and salivary glands. - It does not innervate any abdominal organs.

Q: Which of the following nerves is commonly damaged during McBurney's incision?

Iliohypogastric nerve. ***Iliohypogastric nerve*** - The **iliohypogastric nerve** is most commonly injured during **McBurney's incision** due to its superficial position and transverse course at the level of the incision. - Damage can lead to **numbness** or altered sensation in the suprapubic region, and sometimes **weakness of the lower abdominal wall**. *Subcostal nerve* - The **subcostal nerve** (T12) runs inferior to the 12th rib and is generally superior to the typical site of a McBurney's incision. - Injury to this nerve is less common during this procedure compared to the iliohypogastric and ilioinguinal nerves. *10th thoracic nerve* - The **10th thoracic nerve** (T10) provides sensation around the umbilicus. - While it contributes to innervation of the abdominal wall, its location is typically well above the area of a standard McBurney's incision, making injury unlikely. *11th thoracic nerve* - The **11th thoracic nerve** (T11) innervates the abdominal wall and is located superior to the typical incision site for appendectomy. - Injury to T11 during a McBurney's incision is uncommon as the nerve's course lies cephalad to the surgical field.

Q: During abdominal surgery under local anesthesia, the patient suddenly felt pain due to

Parietal peritoneum. ***Parietal peritoneum*** - The **parietal peritoneum** is richly innervated by somatic nerves (**spinal nerves**), making it highly sensitive to pain, pressure, and temperature. - When stimulated during surgery, even under local anesthesia which might not completely block deeper somatic nerves or if the local block is inadequate, it can cause the patient to suddenly feel **sharp, localized pain**. *Liver* - The liver itself has very few pain receptors in its parenchyma; pain from the liver typically arises from stretching of its fibrous capsule (**Glisson's capsule**). - This pain is usually dull and poorly localized, not the sudden, sharp pain typically experienced during surgical manipulation. *Intestines* - The intestines are primarily innervated by the **autonomic nervous system** and are sensitive to distension and ischemia, causing visceral pain, which is typically dull, crampy, and poorly localized. - They are generally not sensitive to cutting or burning, which are common surgical manipulations. *Visceral peritoneum* - The **visceral peritoneum** covers abdominal organs and is innervated by the autonomic nervous system, similar to the organs it covers. - Like the intestines, it is sensitive to stretch and ischemia, producing diffuse, poorly localized visceral pain rather than sharp, localized pain from surgical incision or manipulation.

Question 1

Suprarenal gland gets its blood supply from all of the following arteries except:

Accepted Answer

Superior mesenteric artery

Answer

Aorta

Answer

Inferior phrenic artery

Answer

Renal artery

Question 2

Inferior pancreaticoduodenal artery is a branch of which of the following arteries?

Accepted Answer

Superior mesenteric artery

Answer

Splenic artery

Answer

Left gastric artery

Answer

Gastroduodenal artery

Question 3

Superior pancreaticoduodenal artery is a branch of?

Accepted Answer

Gastroduodenal artery

Answer

Hepatic artery

Answer

Splenic artery

Answer

Inferior mesenteric artery

Question 4

Which of the following statements about the blood supply of the kidney is NOT true?

Accepted Answer

Renal artery is a branch of common iliac artery

Answer

Right renal artery passes behind IVC

Answer

Branches of renal artery are end arteries

Answer

Renal vein drains into IVC

Question 5

Which of the following structures is not related to the third part of the duodenum?

Accepted Answer

Quadrate lobe of liver

Answer

Superior mesenteric vessels

Answer

Right ureter

Answer

Head of pancreas

Question 6

What is the nerve supply of the cremasteric muscle?

Accepted Answer

Genital branch of genitofemoral nerve

Answer

Pudendal nerve

Answer

Femoral branch of genitofemoral

Answer

Ilioinguinal nerve

Question 7

Which of the following structures does NOT pass through the deep inguinal ring?

Accepted Answer

Ilioinguinal nerve

Answer

Spermatic cord

Answer

Internal spermatic fascia

Answer

Round ligament

Question 8

Sensory nerve supply of gall bladder is through -

Accepted Answer

Vagus nerve (Cranial Nerve X)

Answer

Celiac plexus (sympathetic fibers)

Answer

Trigeminal nerve (Cranial Nerve V)

Answer

Facial nerve (Cranial Nerve VII)

Question 9

Which of the following nerves is commonly damaged during McBurney's incision?

Accepted Answer

Iliohypogastric nerve

Answer

Subcostal nerve

Answer

11th thoracic nerve

Answer

10th thoracic nerve

Question 10

During abdominal surgery under local anesthesia, the patient suddenly felt pain due to

Accepted Answer

Parietal peritoneum

Answer

Liver

Answer

Intestines

Answer

Visceral peritoneum

Abdomen — MCQs

Abdomen — MCQs

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