MCAT Anatomy 4

Question 1

Which structure forms the posterior boundary of the epiploic foramen (foramen of Winslow)?

Accepted Answer

Inferior vena cava

Answer

The inferior vena cava forms the posterior boundary of the epiploic foramen, allowing access to the lesser sac.

Question 2

Wrist drop results from injury to which nerve?

Accepted Answer

Radial nerve

Answer

Radial nerve injury causes wrist drop due to loss of innervation to the wrist and finger extensors.

Question 3

The moderator band (septomarginal trabecula) is found in which cardiac chamber and carries which structure?

Accepted Answer

Right ventricle; right bundle branch

Answer

The moderator band crosses the right ventricle and carries the right bundle branch of the cardiac conduction system.

Question 4

The thoracic duct begins at the cisterna chyli and drains into which venous junction?

Accepted Answer

Left subclavian and left internal jugular junction

Answer

The thoracic duct empties into the left venous angle (junction of left subclavian and left internal jugular veins).

Question 5

The dentate (pectinate) line in the anal canal marks a transition between which two types of epithelium?

Accepted Answer

Simple columnar to stratified squamous

Answer

Above the dentate line the mucosa is simple columnar epithelium; below it transitions to non-keratinized stratified squamous epithelium.

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