Weekly Year 1: Anatomy Exam - May 22, 2026 (Section A: MCQs)

Question 1

A surgeon makes a midline abdominal incision below the umbilicus. Which of the following layers will be encountered LAST before entering the peritoneal cavity?

Accepted Answer

Transversalis fascia — A midline incision below the umbilicus sequentially passes through skin, subcutaneous tissue (Camper's and Scarpa's fascia), linea alba, transversalis fascia, extraperitoneal fat, and finally the parietal peritoneum to enter the peritoneal cavity. The transversalis fascia is the last muscular/fascial layer before the peritoneum.

Question 2

Which statement accurately describes the spleen's normal anatomical position or relations?

Accepted Answer

It is typically related superiorly to the left dome of the diaphragm. — The spleen is located in the left hypochondrium, nestled under the left dome of the diaphragm. Its medial surface is related to the stomach, left kidney, and tail of the pancreas. It is stabilized by ligaments such as the gastrosplenic and splenorenal ligaments.

Question 3

The most common anatomical position of the vermiform appendix, found during appendicectomy, is:

Accepted Answer

Retrocecal — The retrocecal position, where the appendix lies posterior to the cecum, is the most common anatomical variant, found in approximately 65-70% of individuals.

Question 4

Which of the following is a direct visceral branch of the abdominal aorta?

Accepted Answer

Superior mesenteric artery — The superior mesenteric artery is a major direct visceral branch of the abdominal aorta, supplying structures from the duodenum to the distal transverse colon. The common iliac and median sacral arteries are parietal branches, and the inferior epigastric artery is a branch of the external iliac artery.

Question 5

Which part of the duodenum is primarily retroperitoneal?

Accepted Answer

Second (descending) part — The first part of the duodenum is mostly intraperitoneal (except for its posterior aspect), while the second, third, and fourth parts are primarily retroperitoneal, except for the beginning of the fourth part which is intraperitoneal.

Question 6

The ejaculatory duct is formed by the union of which two structures?

Accepted Answer

Seminal vesicle duct and vas deferens — The ejaculatory duct is formed by the union of the duct of the seminal vesicle and the ampulla of the vas deferens (ductus deferens). It then passes through the prostate gland to open into the prostatic urethra.

Question 7

In females, the ureter crosses anterior to which major pelvic vessel?

Accepted Answer

Uterine artery — The ureter passes inferior to the uterine artery in the female pelvis, a relationship famously described as 'water under the bridge'. It also crosses anterior to the common iliac artery bifurcation and external iliac artery.

Question 8

Which of the following layers covering the testicle is derived from the internal oblique muscle during testicular descent?

Accepted Answer

Cremasteric fascia — The cremasteric fascia and cremaster muscle are derived from the internal oblique muscle during the descent of the testis. The external spermatic fascia comes from the external oblique aponeurosis, and the internal spermatic fascia from the transversalis fascia. The tunica vaginalis is derived from the peritoneum.

Question 9

Which artery typically originates from the superior mesenteric artery?

Accepted Answer

Middle colic artery — The middle colic artery is a major branch of the superior mesenteric artery, supplying the transverse colon. The splenic and left gastric arteries are branches of the celiac trunk. The inferior mesenteric artery is a separate direct branch of the abdominal aorta.

Question 10

Which ligament primarily supports the uterus by attaching it to the lateral pelvic walls?

Accepted Answer

Cardinal (transverse cervical) ligament — The cardinal (transverse cervical) ligaments are key suspensory ligaments that extend from the cervix and vagina to the lateral pelvic walls, providing significant support to the uterus and preventing prolapse. The broad ligament is a fold of peritoneum, the round ligament anchors to the labia majora, and uterosacral ligaments connect the uterus to the sacrum.

Question 11

The membranous part of the male urethra passes through which anatomical structure?

Accepted Answer

Deep perineal pouch — The membranous part of the male urethra is the shortest and narrowest part, and it passes through the deep perineal pouch, surrounded by the external urethral sphincter.

Question 12

The paraurethral glands (Skene's glands) in females are embryologically homologous to which structure in males?

Accepted Answer

Prostate gland — The paraurethral glands in females are homologous to the prostate gland in males. Both develop from the urogenital sinus.

Question 13

Benign prostatic hyperplasia (BPH) typically originates in which zone of the prostate gland?

Accepted Answer

Transition zone — Benign prostatic hyperplasia (BPH) predominantly develops in the transition zone of the prostate, which surrounds the urethra. Prostate cancer typically originates in the peripheral zone.

Question 14

Which muscle is located immediately superior to the perineal membrane?

Accepted Answer

Deep transverse perineal muscle — The deep transverse perineal muscle, along with the external urethral sphincter, is located in the deep perineal pouch, which is superior to the perineal membrane. The ischiocavernosus, bulbospongiosus, and superficial transverse perineal muscles are in the superficial perineal pouch, inferior to the perineal membrane.

Question 15

The U-shaped sling around the anorectal junction, crucial for maintaining fecal continence, is formed by which part of the levator ani muscle?

Accepted Answer

Puborectalis — The puborectalis muscle forms a sling around the anorectal junction, pulling it anteriorly to create the anorectal angle, which is essential for fecal continence.

Question 16

The tensor fasciae latae muscle receives its nerve supply from the:

Accepted Answer

Superior gluteal nerve — The tensor fasciae latae muscle is innervated by the superior gluteal nerve (L4, L5, S1).

Question 17

Which structure is intracapsular but extrasynovial in the knee joint?

Accepted Answer

Anterior cruciate ligament — The anterior and posterior cruciate ligaments are located within the fibrous capsule of the knee joint but are excluded from the synovial cavity by folds of synovial membrane, thus making them intracapsular but extrasynovial. Articular cartilage is intrasynovial. The patella is an extra-articular sesamoid bone. The menisci are partly intracapsular and partly intrasynovial at their free edges.

Question 18

The 'screw-home' mechanism of the knee joint involves passive medial rotation of the femur on the tibia during terminal extension. This mechanism causes tightening of which primary ligament, contributing to knee stability?

Accepted Answer

Tibial (medial) collateral ligament — The screw-home mechanism tightens both the collateral and cruciate ligaments, but the tibial (medial) collateral ligament is particularly important in resisting external rotation and providing stability in full extension, along with the anterior cruciate ligament. The question asks for a primary ligament that becomes tight due to the mechanism, and the MCL is a strong contributor to full extension stability.

Question 19

Which of the following is a primary action of the tibialis anterior muscle?

Accepted Answer

Dorsiflexion and inversion of the foot — The tibialis anterior muscle is a powerful dorsiflexor and invertor of the foot. It is also important in supporting the medial longitudinal arch.

Question 20

Which major neurovascular structure passes through the adductor canal?

Accepted Answer

Saphenous nerve — The adductor canal (Hunter's canal) contains the femoral artery, femoral vein, and saphenous nerve. The femoral nerve and obturator nerve do not pass through the adductor canal. The deep femoral artery is a branch of the femoral artery, but typically arises higher in the thigh.

Question 21

The great saphenous vein drains into which major vessel?

Accepted Answer

Femoral vein — The great saphenous vein ascends the medial side of the leg and thigh and typically drains into the femoral vein at the saphenofemoral junction, within the saphenous opening.

Question 22

Which artery is a direct branch of the femoral artery, typically arising proximally in the femoral triangle?

Accepted Answer

Profunda femoris artery — The profunda femoris (deep femoral) artery is the largest branch of the femoral artery, typically arising about 3.5 cm below the inguinal ligament. Perforating arteries are branches of the profunda femoris artery. The obturator and inferior epigastric arteries are branches of the internal and external iliac arteries, respectively.

Question 23

The gluteus maximus muscle is primarily responsible for which action at the hip joint?

Accepted Answer

Extension and lateral rotation — The gluteus maximus is the strongest muscle of the hip, primarily responsible for extension and powerful lateral rotation of the hip joint. It is crucial for standing up from a seated position and climbing stairs.

Question 24

All of the following muscles are part of the adductor compartment of the thigh EXCEPT:

Accepted Answer

Sartorius — The adductor compartment includes adductor longus, adductor brevis, adductor magnus, gracilis, and pectineus. The sartorius muscle is part of the anterior compartment of the thigh.

Question 25

Which of the following arteries does NOT typically contribute to the trochanteric anastomosis?

Accepted Answer

Superficial circumflex iliac artery — The trochanteric anastomosis is formed by branches of the superior gluteal, inferior gluteal, medial circumflex femoral, and lateral circumflex femoral arteries, providing a collateral circulation to the head of the femur. The superficial circumflex iliac artery is a superficial branch of the femoral artery and does not participate in this deep anastomosis.

Question 26

The sciatic nerve typically exits the pelvis through which opening?

Accepted Answer

Greater sciatic foramen — The sciatic nerve, the largest nerve in the body, typically exits the pelvic cavity by passing through the greater sciatic foramen, inferior to the piriformis muscle.

Question 27

Which cranial nerve is responsible for taste sensation from the posterior one-third of the tongue?

Accepted Answer

Glossopharyngeal nerve (CN IX) — The glossopharyngeal nerve (CN IX) provides general sensation and taste innervation to the posterior one-third of the tongue. The facial nerve (CN VII) handles taste from the anterior two-thirds, and the vagus nerve (CN X) provides taste from the epiglottis.

Question 28

Which structure is NOT typically contained within the carotid sheath?

Accepted Answer

Hypoglossal nerve (CN XII) — The carotid sheath typically contains the common carotid artery (medially), internal jugular vein (laterally), and vagus nerve (posteriorly, between the artery and vein). The hypoglossal nerve (CN XII) crosses the lateral surface of the carotid sheath but is generally not considered an 'in-sheath' structure, rather it runs superficial to it for a portion of its course.

Question 29

Motor innervation to the muscles of the hypopharynx is primarily supplied by which cranial nerve, via the pharyngeal plexus?

Accepted Answer

Vagus nerve (CN X) — Most muscles of the pharynx (including the hypopharynx) receive their motor innervation from the pharyngeal plexus, which is primarily formed by branches of the vagus nerve (CN X), with contributions from the glossopharyngeal nerve (CN IX) for stylopharyngeus. Specifically for the hypopharynx constrictors, it's largely Vagus.

Question 30

Which structure passes through the substance of the parotid gland without innervating it?

Accepted Answer

Facial nerve (CN VII) — The facial nerve (CN VII) passes through the parotid gland, dividing it into superficial and deep lobes, but it provides no innervation to the gland itself. The auriculotemporal nerve provides sensory and parasympathetic secretomotor innervation to the gland. The external carotid artery and retromandibular vein also pass through the gland.

Question 31

A patient presents with a deviation of the tongue to the right upon protrusion. This finding suggests a lesion of which cranial nerve?

Accepted Answer

Right Hypoglossal nerve (CN XII) — The genioglossus muscle (innervated by the hypoglossal nerve) is responsible for protruding the tongue. If one hypoglossal nerve is damaged, the intact genioglossus muscle on the contralateral side pushes the tongue towards the side of the lesion (i.e., the paralyzed side). So, deviation to the right indicates a lesion of the right hypoglossal nerve.

Question 32

Which muscle forms the posterior boundary of the posterior triangle of the neck?

Accepted Answer

Trapezius — The posterior triangle of the neck is bounded anteriorly by the posterior border of the sternocleidomastoid, posteriorly by the anterior border of the trapezius, and inferiorly by the middle third of the clavicle. The inferior belly of the omohyoid muscle crosses it.

Question 33

A patient sustained a penetrating injury to the cheek, resulting in an inability to raise the corner of the mouth when smiling. Which branch of the facial nerve was most likely damaged?

Accepted Answer

Zygomatic branch — The zygomatic branch of the facial nerve (CN VII) innervates the orbicularis oculi and muscles that raise the upper lip and corner of the mouth (e.g., zygomaticus major and minor), which are essential for smiling.

Question 34

The occipital and supraclavicular (subclavian) triangles of the neck are separated by which muscle?

Accepted Answer

Omohyoid (inferior belly) — The posterior triangle of the neck is subdivided into the superior occipital triangle and the inferior supraclavicular (subclavian) triangle by the inferior belly of the omohyoid muscle, which crosses it horizontally.

Question 35

The retropharyngeal space is located between the prevertebral fascia and which other fascial layer?

Accepted Answer

Buccopharyngeal fascia — The retropharyngeal space lies between the buccopharyngeal fascia (anteriorly, covering the pharynx and esophagus) and the prevertebral fascia (posteriorly, covering the prevertebral muscles). Infections in this space can spread inferiorly into the posterior mediastinum.

Question 36

Which of the following is an unpaired visceral structure in the abdominal cavity?

Accepted Answer

Spleen — The spleen is an unpaired organ located in the left upper quadrant of the abdomen. Kidneys, adrenal glands, and ureters are all paired structures.

Weekly Year 1: Anatomy Exam - May 22, 2026 (Section A: MCQs)

Questions, Answers & Explanations