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malleus
The malleus or hammer is a hammer-shaped small bone or ossicle of the middle ear which connects with the incus and is attached to the inner surface of the eardrum. The word is Latin for ''hammer'' or ''mallet''. It transmits the sound vibrations from the eardrum to the ''incus''.
==Structure==
The malleus is a bone situated in the middle ear. It is the first of the three ossicles, and attached to the tympanic membrane. The ''head of the malleus'' is the large protruding section, which attaches to the incus. The head connects to the ''neck of malleus'', and the bone continues as the ''handle of malleus'', which connects to the tympanic membrane. Between the neck and handle of the malleus, ''lateral'' and ''anterior processes'' emerge from the bone.
The malleus is unique to mammals, and evolved from a lower jaw bone in basal amniotes called the articular, which still forms part of the jaw joint in reptiles and birds.
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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