Anatomy Which of the following veins crosses perpendicularly the superficial surface of the sternocleidomastoid surface directly beneath the platysma muscle? A Retromandibular B Anterior jugular C Posterior auricular D External jugular 💡 Explanation Which of the following veins crosses perpendicularly the superficial surface of the sternocleidomastoid surface directly beneath the platysma muscle? ✓ Correct Answer: D. External jugular