CCEP Extremity Anatomy 5 — Questions and Answers
Question 1: The quadrangular (quadrilateral) space transmits which neurovascular structures?
- Radial nerve and profunda brachii artery
- Axillary nerve and posterior circumflex humeral artery (Correct answer)
- Musculocutaneous nerve and anterior circumflex humeral artery
- Suprascapular nerve and suprascapular artery
Correct answer: Axillary nerve and posterior circumflex humeral artery
The quadrangular space, bounded by teres minor, teres major, long head of triceps, and humerus, transmits the axillary nerve and posterior circumflex humeral artery.
Question 2: Which structure prevents anterior displacement of the femoral head on the tibia during knee flexion?
- Posterior cruciate ligament
- Anterior cruciate ligament (Correct answer)
- Medial collateral ligament
- Arcuate ligament complex
Correct answer: Anterior cruciate ligament
The anterior cruciate ligament (ACL) primarily resists anterior tibial translation relative to the femur and also limits internal rotation of the tibia.
Question 3: The flexor digitorum superficialis (FDS) inserts on which part of the digit?
- Distal phalanx (dorsal base)
- Middle phalanx (palmar sides) (Correct answer)
- Proximal phalanx (base)
- Extensor expansion (dorsal hood)
Correct answer: Middle phalanx (palmar sides)
The FDS splits into two slips (Camper's chiasm) and inserts on the palmar sides of the middle phalanx of digits 2–5, flexing the PIP joint primarily.
Question 4: Which of the following best describes the path of the popliteal artery in the popliteal fossa?
- Most medial structure in the fossa
- Deepest structure, closest to the femur and tibia (Correct answer)
- Most lateral structure, adjacent to the common peroneal nerve
- Superficial to the tibial nerve
Correct answer: Deepest structure, closest to the femur and tibia
In the popliteal fossa, the popliteal artery is the deepest structure, lying directly on the posterior capsule of the knee joint, with the vein and tibial nerve progressively more superficial.
Question 5: The spring (calcaneonavicular) ligament supports which structure from below?
- Sustentaculum tali
- Head of the talus (Correct answer)
- Cuboid bone
- Navicular tuberosity
Correct answer: Head of the talus
The plantar calcaneonavicular (spring) ligament spans from the sustentaculum tali to the navicular, providing critical inferior support for the talar head and maintaining the medial longitudinal arch.
Question 6: Which muscle originates from the coracoid process of the scapula and inserts on the medial shaft of the humerus?
- Pectoralis minor
- Short head of biceps brachii
- Coracobrachialis (Correct answer)
- Subscapularis
Correct answer: Coracobrachialis
The coracobrachialis originates from the coracoid process and inserts on the medial humerus approximately midshaft, adducting and flexing the arm.
Question 7: The posterior interosseous nerve (deep branch of the radial nerve) enters the posterior forearm by passing through which structure?
- Cubital tunnel
- Arcade of Struthers
- Supinator muscle (arcade of Frohse) (Correct answer)
- Pronator teres
Correct answer: Supinator muscle (arcade of Frohse)
The posterior interosseous nerve passes through the radial tunnel between the two heads of the supinator muscle at the arcade of Frohse, where it can become entrapped.
CCEP Extremity Anatomy 5
The quadrangular (quadrilateral) space transmits which neurovascular structures?