👉 Mesosternal is a medical term used to describe a specific type of cell in the body that produces and secretes hormones. Mesothelial cells are specialized epithelial cells found primarily in the lining of the thoracic cavities, including the pleura (the thin membrane covering the lungs), peritoneum (a sac-like structure surrounding the abdomen), and mesenteric lymph nodes (small淋巴结) which help regulate body temperature by secreting secretions that cool down the body.