🔹Canal: A long passage within bone that transits blood vessels and nerves
🔹Foramen: A natural opening or perforation through bone that permits transit of blood vessels and nerves (pl. foramina)
🔹Fossa: A hollow or depressed area on the surface of bone (pl. fossae)
🔹Notch: A curved depression or indentation
🔹Pit, groove and fissure: Depressions that serve to increase the extent of surface for the attachment of ligaments and muscles (pit is circular but groove and fissure are linear).
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