Medical | Health | Anatomy on Instagram: "The flexor digitorum profundus (FDP) is one of the most powerful and fascinating muscles in your forearm — and you use it every single time you pick something up. Although hidden deep beneath other forearm muscles, the FDP is the one responsible for bending the tips of your fingers. Whether you’re gripping a pen, holding a phone, typing, or clenching a fist, this muscle is doing the heavy lifting. It starts in the forearm, travels down through the wrist,