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Fish head
Fish heads, either separated or still attached to the rest of the fish, are sometimes used in food dishes, or boiled for fish stock.
==Anatomy==
The head of a fish includes the snout, from the eye to the forward most point of the upper jaw, the operculum or gill cover (absent in sharks and jawless fish), and the cheek, which extends from eye to preopercle. The operculum and preopercle may or may not have spines. In sharks and some primitive bony fish a spiracle, small extra gill opening, is found behind each eye.〔Romer, Alfred Sherwood; Parsons, Thomas S. (1977). The Vertebrate Body. Philadelphia, PA: Holt-Saunders International. pp. 161–177. ISBN 0-03-910284-X.〕
The skull in fishes is formed from a series of only loosely connected bones. Jawless fish and sharks only poses a cartilaginous endocranium, with both the upper an lower jaws being separate elements. Bony fishes has additional dermal bone, forming a more or less coherent skull roof in lungfish and holost fish. The lower jaw defines a chin.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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