1. General Principles & Basic Science MCQs

In a patient presenting with deep gluteal pain and suspected piriformis syndrome, anatomical variations in the sciatic nerve must be considered. What is the most common anatomical variant of the sciatic nerve relative to the piriformis muscle?

A 30-year-old motorcyclist sustains a traction injury to the upper trunk of his brachial plexus (C5-C6). Which of the following terminal nerve branches is derived exclusively from the lateral cord?

A microsurgeon is planning to harvest a sural nerve graft for a brachial plexus reconstruction. To safely and efficiently locate the nerve in the distal third of the leg, the surgeon should identify which of the following accompanying structures?

During a pectoralis major tendon repair following a complete rupture at the musculotendinous junction, the surgeon mobilizes the sternocostal and clavicular heads. What is the normal anatomical insertion pattern of these two heads onto the humerus?

A 65-year-old patient is undergoing a total hip arthroplasty via the anterior (Smith-Petersen) approach. Which of the following capsular ligaments is the strongest in the body and acts as the primary restraint to hip hyperextension?

A 24-year-old pitcher experiences posterior shoulder pain and isolated weakness in external rotation. An MRI reveals a paralabral cyst compressing a nerve within the quadrangular space. Which of the following structures forms the superior border of this space?

A patient cannot flex the interphalangeal joint of the thumb and the distal interphalangeal joint of the index finger. Which of the following muscles is also likely to be affected by this specific nerve palsy?

During a medial meniscal repair, a surgeon places a retractor posteromedially. Postoperatively, the patient reports numbness over the anteromedial aspect of the lower leg. Which of the following nerves was most likely injured as it exited the adductor canal?

In a patient presenting with buttock pain radiating down the posterior thigh, an MRI reveals an anatomic variant where the common peroneal division of the sciatic nerve passes directly through the piriformis muscle, while the tibial division passes below it. What is the approximate prevalence of this anatomic variant?

A patient presents with an inability to actively extend the knee and numbness over the anterior thigh and medial calf following a retroperitoneal hematoma. The affected nerve is formed by the posterior divisions of which anterior rami?

During a posterolateral approach to the distal humerus, the surgeon identifies the radial nerve as it pierces the lateral intermuscular septum. At approximately what distance proximal to the radiocapitellar joint does this occur?

Which of the following structures forms the medial border of the quadrangular space in the posterior shoulder?

In an anterior pelvic ring injury requiring internal fixation, the surgeon must be mindful of the "corona mortis". This vascular structure represents an anastomosis between the obturator vessels and branches of which of the following?

During a volar Henry approach to the forearm, the surgeon needs to expose the proximal radius. Pronation of the forearm protects the posterior interosseous nerve (PIN). The PIN passes between the two heads of which muscle?

The superficial palmar arch provides the primary blood supply to the digits and is formed predominantly by the ulnar artery. In which anatomical plane does the superficial palmar arch lie?

A patient undergoes a total hip arthroplasty via a direct anterior approach. The surgeon utilizes the true internervous plane between the tensor fasciae latae and the sartorius. Which nerve supplies the tensor fasciae latae?

A surgeon uses the Smith-Petersen approach for a periacetabular osteotomy. During the deep dissection, the internervous plane is developed between which two muscles?

A 32-year-old overhead throwing athlete presents with poorly localized posterior shoulder pain and deltoid weakness. MRI reveals a paralabral cyst in the quadrilateral space. What nerve and artery are most likely compressed?

During an anterior surgical approach to the acetabulum (ilioinguinal approach), severe bleeding is encountered behind the superior pubic ramus. This is most likely due to an injury to the 'corona mortis.' The corona mortis is an anastomosis between which two vascular systems?