Surgical Anatomy & Approaches MCQs

Which major nerve exits the pelvis by passing between the sacrotuberous and sacrospinous ligaments before entering Alcock's canal, making it vulnerable to compression in this region?

A patient presents with numbness and tingling along the lateral aspect of the thigh, without motor weakness. This condition is known as meralgia paresthetica. Which nerve is entrapped as it passes under the inguinal ligament near the anterior superior iliac spine (ASIS)?

Which of the following nerves carries both motor and sensory fibers, originates from the brachial plexus, and supplies the coracobrachialis, biceps brachii, and brachialis muscles?

During surgical approach to the posterior knee, the surgeon must identify the popliteal artery and vein. Which of the following nerves crosses superficial (posterior) to the popliteal artery and vein in the popliteal fossa, making it vulnerable during posterior dissections?

A 35-year-old male undergoes surgical fixation of an anterior column acetabular fracture via the ilioinguinal approach. During dissection along the superior pubic ramus, brisk arterial bleeding is encountered. This bleeding is most likely originating from an anastomotic vessel connecting the obturator system to which of the following vessels?

A 29-year-old elite volleyball player presents with poorly localized posterior shoulder pain and fatigue. Examination reveals weakness in external rotation. MRI arthrogram reveals an intact labrum but shows isolated atrophy of the teres minor muscle. Which anatomical structure forms the superior boundary of the space where the affected neurovascular bundle is compressed?

A surgeon is performing a direct anterior approach to the hip for a total hip arthroplasty. To avoid injury to the lateral femoral cutaneous nerve (LFCN), the superficial dissection is carried out between two specific muscles. What is the innervation of the muscle that forms the medial border of this superficial internervous plane?

A 35-year-old male sustains an anterior pelvic ring fracture requiring open reduction and internal fixation via an ilioinguinal approach. During dissection over the superior pubic ramus, brisk arterial bleeding is encountered. This is most likely due to iatrogenic injury of an anastomotic vessel connecting the external iliac system to which of the following arteries?

During open reduction and internal fixation of a proximal humerus fracture via a deltopectoral approach, blunt retractors are placed inferiorly to mobilize the head fragment. The axillary nerve is at risk during this maneuver. The axillary nerve exits the axilla by passing through the quadrangular space. Which structure forms the superior border of this space?

A 31-year-old professional volleyball player complains of poorly localized posterior shoulder pain and weakness in external rotation. Examination demonstrates isolated atrophy of the teres minor. MRI reveals a multiloculated paralabral cyst compressing the axillary nerve within the quadrangular space. Which of the following muscles forms the superior border of this anatomical space?

A 55-year-old male undergoes open reduction and internal fixation of an anterior pelvic ring fracture via a modified Stoppa approach. During subperiosteal dissection along the superior pubic ramus, brisk arterial bleeding is encountered posterior to the pubic symphysis. The injury is identified as the corona mortis. This vascular structure typically represents a significant anastomosis between which two major vascular systems?

A 42-year-old male sustains an anterior pelvic ring fracture and undergoes open reduction and internal fixation via an ilioinguinal approach. During dissection along the superior pubic ramus, brisk arterial bleeding is encountered from an aberrant vessel. The injured vessel, known as the corona mortis, is an anastomosis between which two vascular systems?

A 35-year-old male is undergoing an open Latarjet procedure for recurrent anterior shoulder instability with significant glenoid bone loss. The surgeon must be cautious of the axillary nerve during the inferior capsular release. The axillary nerve exits the axilla through the quadrangular space. Which of the following accurately identifies the anatomical boundaries of the quadrangular space?

A 55-year-old female undergoes a lateral lumbar interbody fusion (LLIF) at L4-L5 via a lateral transpsoas approach. Postoperatively, she reports profound new-onset weakness in hip flexion and knee extension, along with paresthesia over the anterior thigh. The femoral nerve was likely injured by the retractor during the approach. Within the cross-section of the psoas major muscle at the L4-L5 disc space level, where does the femoral nerve/lumbar plexus typically reside?

During the anterior (Henry) approach to the proximal radius, the surgeon develops the internervous plane between the brachioradialis and the pronator teres. Which of the following vascular structures must typically be identified and ligated to adequately mobilize the brachioradialis laterally and safely expose the supinator?

During a lateral transpsoas approach to the L4-L5 disc space, the surgeon must carefully navigate the psoas major muscle to avoid iatrogenic nerve injury. At this specific level, where is the lumbar plexus typically located in relation to the psoas major muscle?

When performing an anterior (Smith-Petersen) approach to the hip, two distinct internervous planes are utilized. Which of the following accurately describes the deep internervous plane and the major vascular structure at risk that must often be ligated within this interval?

During a deltopectoral approach for a proximal humerus fracture, the surgeon must be cautious of the axillary nerve. At what average distance from the lateral edge of the acromion does the axillary nerve typically traverse the deep surface of the deltoid?

During an ilioinguinal approach for open reduction and internal fixation of an anterior column acetabular fracture, brisk arterial bleeding is encountered while dissecting over the superior pubic ramus. The vessel injured is the 'corona mortis'. This vascular structure represents an anastomosis between which of the following arterial systems?

A surgeon is performing a volar (Henry) approach to the radius to plate a proximal third radial shaft fracture. To safely expose the proximal radius, an internervous plane must be developed. Which two muscles define this proximal internervous plane, and what are their respective innervations?