Trephine
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A trephine is a surgical instrument with a cylindrical blade. It can be of one of several dimensions and designs depending on what it is meant to be used for. A trephine may be specially designed for
A trephine with a center pin can be seen on the left.
Dr. John Clarke trepanning a skull, ca. 1664, in one of the earliest American portraits. Clarke has a trephine in his right hand. The painting is in Harvard Medical School.
Bone
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A bone is a rigid organ that constitutes part of the skeleton in most vertebrate animals. Bones protect the organs of the body, produce red and white blood cells, store minerals, help regulate acid-ba
A bone dating from the Pleistocene Ice Age of an extinct species of an elephant, possibly a mammoth
A scanning electronic micrograph of a Wistar rat's bone at 10,000× magnification
Structure of a long bone
Cross-section details of a long bone