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The calf (Latin: sura) denotes the posterior compartment of the lower leg. This region is characterized by a prominent muscular contour that tapers inferiorly toward the ankle. The calf overlies the posterior aspects of the tibia and fibula and lies in proximity to major neural and vascular structures, including the tibial and sural nerves, popliteal artery, and posterior tibial vein. The calf plays a central role in posture, locomotion, and forceful plantarflexion during gait. Dysfunction in the calf, whether from trauma, vascular compromise, or neuropathic injury, can result in impaired gait, muscle weakness, or chronic pain. Clinically, this region is significant for the assessment of compartment syndrome, evaluation of vascular status, and planning of surgical approaches. Detailed understanding of calf anatomy and function allows clinicians to diagnose conditions, such as deep vein thrombosis, muscle tears, and peripheral neuropathies, guide interventions like fasciotomy, tendon repair, or vascular access, and reduce the risk of iatrogenic injury to nerves and vessels.