Extremity Anatomy Flashcards

Which nerve passes through the cubital tunnel at the elbow and is most vulnerable to compression there?

Answer: Ulnar nerve

The ulnar nerve passes posterior to the medial epicondyle through the cubital tunnel, making it highly susceptible to entrapment and compression.

The anatomical snuffbox is bordered radially by which tendon?

Answer: Extensor pollicis longus

The ulnar (medial) border of the anatomical snuffbox is formed by the extensor pollicis longus tendon, while the radial border is formed by abductor pollicis longus and extensor pollicis brevis.

Which of the following is the primary stabilizer of the distal radioulnar joint (DRUJ)?

Answer: Triangular fibrocartilage complex (TFCC)

The triangular fibrocartilage complex (TFCC) is the primary stabilizer of the distal radioulnar joint and also distributes load across the ulnar side of the wrist.

The lateral compartment of the leg contains which muscles?

Answer: Peroneus longus and peroneus brevis

The lateral compartment of the leg contains the peroneus (fibularis) longus and peroneus brevis, both innervated by the superficial peroneal nerve.

Which bone of the foot articulates with both the talus proximally and the navicular distally?

Answer: No bone — the talus articulates directly with the navicular

The talus articulates directly with the navicular anteriorly; there is no interposed bone between them — the talonavicular joint is part of the transverse tarsal joint.

The coracohumeral ligament primarily limits which motion of the glenohumeral joint?

Answer: External rotation in adduction

The coracohumeral ligament, running from the coracoid process to the greater and lesser tubercles, is a primary restraint to external rotation when the arm is adducted.

Which tarsal bone is entirely covered by articular cartilage on five of its six surfaces?

Answer: Talus

The talus is unique in that approximately 60–70% of its surface is covered by articular cartilage, and it has no direct muscular attachments.