MCAT Anatomy 2 — Questions and Answers
Question 1: Which nerve innervates the diaphragm?
- Vagus nerve (CN X)
- Phrenic nerve (C3-C5) (Correct answer)
- Intercostal nerves
- Thoracic splanchnic nerve
Correct answer: Phrenic nerve (C3-C5)
The phrenic nerve, arising from cervical spinal levels C3-C5, provides motor innervation to the diaphragm.
Question 2: The coronary sinus drains into which cardiac chamber?
- Right ventricle
- Left atrium
- Right atrium (Correct answer)
- Left ventricle
Correct answer: Right atrium
The coronary sinus collects venous blood from the myocardium and drains into the right atrium.
Question 3: Which ligament connects the liver to the anterior abdominal wall and contains the ligamentum teres hepatis?
- Hepatoduodenal ligament
- Falciform ligament (Correct answer)
- Coronary ligament
- Gastrohepatic ligament
Correct answer: Falciform ligament
The falciform ligament attaches the liver to the anterior abdominal wall and contains the ligamentum teres hepatis (obliterated umbilical vein).
Question 4: The inguinal ligament is formed by the lower edge of which abdominal muscle's aponeurosis?
- Internal oblique
- Transversus abdominis
- External oblique (Correct answer)
- Rectus abdominis
Correct answer: External oblique
The inguinal ligament is the folded-under lower edge of the external oblique aponeurosis, running from the ASIS to the pubic tubercle.
Question 5: Broca's area, responsible for speech production, is located in which lobe of the brain?
- Temporal lobe
- Parietal lobe
- Occipital lobe
- Frontal lobe (Correct answer)
Correct answer: Frontal lobe
Broca's area is located in the inferior frontal gyrus of the frontal lobe (Brodmann areas 44 and 45).
Question 6: Which structure passes through the carpal tunnel along with the nine flexor tendons?
- Ulnar nerve
- Radial nerve
- Median nerve (Correct answer)
- Anterior interosseous nerve
Correct answer: Median nerve
The median nerve and nine flexor tendons (4 FDS, 4 FDP, 1 FPL) pass through the carpal tunnel.
Question 7: The pterygoid plexus of veins drains into which vessel?
- Internal jugular vein
- External jugular vein
- Maxillary vein (Correct answer)
- Facial vein
Correct answer: Maxillary vein
The pterygoid plexus drains primarily into the maxillary vein, which joins the superficial temporal vein to form the retromandibular vein.
MCAT Anatomy 2
Which nerve innervates the diaphragm?