The narrow region between the head and diaphysis of a long bone is called the canal.
The diaphysis is also called the shafts which are the main portions of a long bone. A bone that is longer than its width and provide most of their length.
Canal is present between the head and diaphysis of a long bone which is a narrow region so we can conclude that the narrow region between the head and diaphysis of a long bone is canal.
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