1
COMSAE PHASE 2 EXAM 2026/2027 |
COMPREHENSIVE MEDICAL SELF-ASSESSMENT |
100 VERIFIED Q&A | DETAILED RATIONALES |
PASS GUARANTEED – A+ GRADED
SECTION 1: ANATOMY AND EMBRYOLOGY – Questions 1–10
Q1: Anatomy – Cranial Nerves
The student is reviewing cranial nerves. Which cranial nerve innervates the muscles of mastication?
A. CN V (trigeminal)
B. CN VII (facial)
C. CN IX (glossopharyngeal)
D. CN X (vagus)
Correct Answer: A
Rationale: The mandibular division of CN V (trigeminal) innervates the muscles of mastication:
masseter, temporalis, medial pterygoid, and lateral pterygoid. CN VII controls facial expression.
[100% CORRECT]
Q2: Embryology – Branchial Arches
The student is reviewing branchial arches. The stapes is derived from which branchial arch?
A. 1st
B. 2nd
C. 3rd
D. 4th
Correct Answer: B
Rationale: The 2nd branchial arch gives rise to the stapes, styloid process, stylohyoid ligament, and
muscles of facial expression. The 1st arch gives malleus and incus. [100% CORRECT]
Q3: Anatomy – Upper Limb
The student is reviewing upper limb anatomy. Which nerve is injured in a midshaft humeral
fracture?
A. Axillary nerve
B. Radial nerve
C. Median nerve
D. Ulnar nerve
Correct Answer: B
Rationale: The radial nerve runs in the spiral groove of the humerus and is commonly injured in
midshaft fractures, causing wrist drop. Axillary nerve is injured in surgical neck fractures. [100%
CORRECT]
,2
Q4: Embryology – Gastrointestinal Tract
The student is reviewing embryology. The midgut rotates how many degrees during development?
A. 90 degrees
B. 180 degrees
C. 270 degrees
D. 360 degrees
Correct Answer: C
Rationale: The midgut rotates 270 degrees counterclockwise around the superior mesenteric artery
during development. [100% CORRECT]
Q5: Anatomy – Pelvis
The student is reviewing pelvic anatomy. Which structure is located immediately posterior to the
pubic symphysis?
A. Bladder
B. Uterus
C. Rectum
D. Prostate
Correct Answer: A
Rationale: The urinary bladder lies immediately posterior to the pubic symphysis. In males, the
prostate is inferior to the bladder. The rectum is posterior to the bladder. [100% CORRECT]
Q6: Embryology – Heart
The student is reviewing cardiac embryology. The ductus arteriosus connects which two structures?
A. Aorta and pulmonary artery
B. Aorta and pulmonary vein
C. Superior vena cava and right atrium
D. Left atrium and right atrium
Correct Answer: A
Rationale: The ductus arteriosus connects the pulmonary artery to the aorta, shunting blood away
from the lungs in fetal circulation. It becomes the ligamentum arteriosum after birth. [100%
CORRECT]
Q7: Anatomy – Head and Neck
The student is reviewing head and neck anatomy. Which muscle is the primary flexor of the neck?
A. Sternocleidomastoid
B. Trapezius
C. Scalenes
D. Longus colli
Correct Answer: A
Rationale: The sternocleidomastoid flexes the neck and rotates the head to the opposite side.
Bilateral contraction flexes the neck. [100% CORRECT]
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Q8: Embryology – Urinary System
The student is reviewing urinary embryology. The ureter develops from which structure?
A. Metanephros
B. Ureteric bud
C. Mesonephric duct
D. Cloaca
Correct Answer: B
Rationale: The ureteric bud arises from the mesonephric duct and gives rise to the ureter, renal
pelvis, calyces, and collecting ducts. The metanephros forms the kidney parenchyma. [100%
CORRECT]
Q9: Anatomy – Thorax
The student is reviewing thoracic anatomy. The azygos vein drains into which structure?
A. Superior vena cava
B. Inferior vena cava
C. Pulmonary vein
D. Left brachiocephalic vein
Correct Answer: A
Rationale: The azygos vein drains into the superior vena cava at the level of T4. It drains the
posterior thoracic and abdominal walls. [100% CORRECT]
Q10: Embryology – Nervous System
The student is reviewing neural development. The neural crest cells give rise to which of the
following?
A. Melanocytes
B. Neurons of the CNS
C. Oligodendrocytes
D. Ependymal cells
Correct Answer: A
Rationale: Neural crest cells migrate and differentiate into melanocytes, peripheral neurons,
Schwann cells, and adrenal medulla. CNS neurons, oligodendrocytes, and ependymal cells derive
from the neural tube. [100% CORRECT]
SECTION 2: PHYSIOLOGY – Questions 11–20
Q11: Physiology – Respiratory
The student is reviewing respiratory physiology. What is the primary stimulus for breathing?
A. Oxygen levels
B. Carbon dioxide levels
COMSAE PHASE 2 EXAM 2026/2027 |
COMPREHENSIVE MEDICAL SELF-ASSESSMENT |
100 VERIFIED Q&A | DETAILED RATIONALES |
PASS GUARANTEED – A+ GRADED
SECTION 1: ANATOMY AND EMBRYOLOGY – Questions 1–10
Q1: Anatomy – Cranial Nerves
The student is reviewing cranial nerves. Which cranial nerve innervates the muscles of mastication?
A. CN V (trigeminal)
B. CN VII (facial)
C. CN IX (glossopharyngeal)
D. CN X (vagus)
Correct Answer: A
Rationale: The mandibular division of CN V (trigeminal) innervates the muscles of mastication:
masseter, temporalis, medial pterygoid, and lateral pterygoid. CN VII controls facial expression.
[100% CORRECT]
Q2: Embryology – Branchial Arches
The student is reviewing branchial arches. The stapes is derived from which branchial arch?
A. 1st
B. 2nd
C. 3rd
D. 4th
Correct Answer: B
Rationale: The 2nd branchial arch gives rise to the stapes, styloid process, stylohyoid ligament, and
muscles of facial expression. The 1st arch gives malleus and incus. [100% CORRECT]
Q3: Anatomy – Upper Limb
The student is reviewing upper limb anatomy. Which nerve is injured in a midshaft humeral
fracture?
A. Axillary nerve
B. Radial nerve
C. Median nerve
D. Ulnar nerve
Correct Answer: B
Rationale: The radial nerve runs in the spiral groove of the humerus and is commonly injured in
midshaft fractures, causing wrist drop. Axillary nerve is injured in surgical neck fractures. [100%
CORRECT]
,2
Q4: Embryology – Gastrointestinal Tract
The student is reviewing embryology. The midgut rotates how many degrees during development?
A. 90 degrees
B. 180 degrees
C. 270 degrees
D. 360 degrees
Correct Answer: C
Rationale: The midgut rotates 270 degrees counterclockwise around the superior mesenteric artery
during development. [100% CORRECT]
Q5: Anatomy – Pelvis
The student is reviewing pelvic anatomy. Which structure is located immediately posterior to the
pubic symphysis?
A. Bladder
B. Uterus
C. Rectum
D. Prostate
Correct Answer: A
Rationale: The urinary bladder lies immediately posterior to the pubic symphysis. In males, the
prostate is inferior to the bladder. The rectum is posterior to the bladder. [100% CORRECT]
Q6: Embryology – Heart
The student is reviewing cardiac embryology. The ductus arteriosus connects which two structures?
A. Aorta and pulmonary artery
B. Aorta and pulmonary vein
C. Superior vena cava and right atrium
D. Left atrium and right atrium
Correct Answer: A
Rationale: The ductus arteriosus connects the pulmonary artery to the aorta, shunting blood away
from the lungs in fetal circulation. It becomes the ligamentum arteriosum after birth. [100%
CORRECT]
Q7: Anatomy – Head and Neck
The student is reviewing head and neck anatomy. Which muscle is the primary flexor of the neck?
A. Sternocleidomastoid
B. Trapezius
C. Scalenes
D. Longus colli
Correct Answer: A
Rationale: The sternocleidomastoid flexes the neck and rotates the head to the opposite side.
Bilateral contraction flexes the neck. [100% CORRECT]
, 3
Q8: Embryology – Urinary System
The student is reviewing urinary embryology. The ureter develops from which structure?
A. Metanephros
B. Ureteric bud
C. Mesonephric duct
D. Cloaca
Correct Answer: B
Rationale: The ureteric bud arises from the mesonephric duct and gives rise to the ureter, renal
pelvis, calyces, and collecting ducts. The metanephros forms the kidney parenchyma. [100%
CORRECT]
Q9: Anatomy – Thorax
The student is reviewing thoracic anatomy. The azygos vein drains into which structure?
A. Superior vena cava
B. Inferior vena cava
C. Pulmonary vein
D. Left brachiocephalic vein
Correct Answer: A
Rationale: The azygos vein drains into the superior vena cava at the level of T4. It drains the
posterior thoracic and abdominal walls. [100% CORRECT]
Q10: Embryology – Nervous System
The student is reviewing neural development. The neural crest cells give rise to which of the
following?
A. Melanocytes
B. Neurons of the CNS
C. Oligodendrocytes
D. Ependymal cells
Correct Answer: A
Rationale: Neural crest cells migrate and differentiate into melanocytes, peripheral neurons,
Schwann cells, and adrenal medulla. CNS neurons, oligodendrocytes, and ependymal cells derive
from the neural tube. [100% CORRECT]
SECTION 2: PHYSIOLOGY – Questions 11–20
Q11: Physiology – Respiratory
The student is reviewing respiratory physiology. What is the primary stimulus for breathing?
A. Oxygen levels
B. Carbon dioxide levels
