There isn't one single bone universally described as "Y-shaped." Several bones or bone structures exhibit a Y-shape, depending on the context. The shape is often a result of the bone's function and location within the body.
Examples of Y-Shaped Bone Structures:
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Odontoid Process Trabecular Structure: Research indicates a Y-shaped trabecular (spongy) bone structure within the odontoid process (dens) of the axis vertebra. See: The Y-shaped trabecular bone structure in the odontoid process of... This is an internal structure, not the overall shape of the bone itself.
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Reptilian Vertebrae: Some reptile vertebrae possess a Y-shaped chevron bone attached to the ventral (underside) surface of the centrum (the main body of the vertebra). [See reference mentioning Y-shaped chevron bone in reptile vertebrae](Reference provided mentions this but doesn't link to a specific publication).
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Surgical Implants: Various surgical plates used in bone fracture repair are designed in a Y-shape for enhanced stability and fixation. See examples: Comparison of lag screws and double Y-shaped miniplates..., SK Surgicals SS Mini Bone Plates Y Shape, Maxillofacial Plates Thickness 0.6mm Y-Shaped Bone Type-II Plate These are not naturally occurring bones.
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Fish Bones: Certain fish species have bones described as "Y-shaped" in their skeletal structure. See: Functional Morphology of Y-Bones in Esocid Fishes. The specific bone and its location vary depending on the fish species.
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Bilateral Alveolar Cleft Reconstruction: Surgical procedures for repairing bilateral cleft alveolus may involve the use of a Y-shaped tongue flap and bone graft; this is a created Y-shape using tissues rather than a single naturally occurring bone. See: Two-stage reconstruction of bilateral alveolar cleft using Y-shaped...
It's crucial to specify the anatomical location or species when referring to a Y-shaped bone to avoid ambiguity.
