Classical Unani literature describes Iẓā‘m (bones) as the foremost among the A‘ḍā’ Mufrada (simple organs), serving as the essential foundation of the human body. Their hardness and dryness are considered natural qualities that enable bones to bear weight, provide structural support and protect delicate organs such as the brain, heart and lungs. Although bones are recognized as the coldest and driest tissues. Unani scholars note that they contain enough moisture to allow nourishment and sustain life. Bone classification differs among early authorities: Galen divided bones into long and flat, whereas later Unani physicians categorized them into four types long, flat, short and irregular. Vesalius advanced anatomical understanding by identifying cortical and cancellous regions, marrow-filled cavities and the periosteum that supplies sensation. Avicenna similarly distinguished compact from spongy bone and emphasized the role of marrow in moderating bone dryness created by movement. Unani scholars outlined several key functions of bones: enabling controlled motion, providing pathways for vaporous waste, protecting vital organs, supporting variations in organ size, stabilizing body structures and coordinating joint movements. Classical texts report varying bone counts from 242 to 248 based on differing inclusion of teeth, sesamoid bones and ear ossicles contrasting with the modern adult count of 206 bones after natural fusion. The significance of bones is further shown in their role in waste ventilation. Skull bones contain fine openings and sutures that allow vapours to escape, safeguarding the brain. Large bones such as the femur and tibia are hollow and contain nourishing marrow, facilitating both strength and efficient movement.