CSFA Surgical Anatomy and Physiology 4

Question 1

Which retroperitoneal structure crosses the pelvic brim at the bifurcation of the iliac vessels and is at risk during pelvic surgery?

Accepted Answer

Ureter

Answer

The ureter crosses the pelvic brim at the bifurcation of the common iliac artery, making it vulnerable during pelvic dissections such as hysterectomy and colorectal resections.

Question 2

The angle of Louis (sternal angle) is a reliable surface landmark for identifying which anatomic structure?

Accepted Answer

Carina and bifurcation of the trachea

Answer

The sternal angle corresponds to the T4–T5 vertebral level, marking the carina where the trachea bifurcates into the main bronchi.

Question 3

During a femoral hernia repair, which structure forms the medial boundary of the femoral ring?

Accepted Answer

Lacunar (Gimbernat's) ligament

Answer

The lacunar ligament forms the sharp medial boundary of the femoral ring and must be carefully divided to reduce an incarcerated femoral hernia.

Question 4

Which physiologic response describes the shift of the oxyhemoglobin dissociation curve to the right, favoring oxygen release to tissues?

Accepted Answer

Bohr effect caused by decreased pH, increased CO2, and increased 2,3-DPG

Answer

Decreased pH, increased PCO2, elevated temperature, and increased 2,3-DPG all shift the curve rightward (Bohr effect), lowering hemoglobin's affinity for O2 and promoting release to metabolically active tissues.

Question 5

The obturator nerve (L2–L4) exits the pelvis through the obturator foramen and primarily innervates which muscle group?

Accepted Answer

Medial thigh adductors

Answer

The obturator nerve innervates the medial compartment adductor muscles of the thigh including adductor longus, brevis, magnus, and gracilis.

CSFA - Certified Surgical First Assistant Practice Test

CSFA - Certified Surgical First Assistant Practice Test

CSFA Surgical Anatomy and Physiology 4