USMLE High-Yield Questions on Instagram: "“Meat mill reflex” ⸻ 📚 EXPLANATION (WITH ANSWER) Mandem’s testes move upward toward the body due to contraction of the cremaster muscle. This is the cremasteric reflex, mediated by L1–L2 spinal nerve roots. Primary purpose: thermoregulation. Sperm production needs a temperature slightly below core body temp. When there’s stimulation or cold, the reflex pulls the testes closer to prevent excessive cooling. 👉 Correct answer: B) Prevent excessive cooling