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In the embryo, the temporal bone consists of five separate sections: periodic, squamous, tympanic, stylohyal, and tympanohyal. However, in adults, each bone is a compound structure composed of four portions: the petromastoid, squamous, tympanic, and styloid process.
(4) The stylohyoid apparatus has four distinct segments: tympanohyal, stylohyal, ceratohyal, and hypohyal.
(3) Reichert's cartilage is divided into a dorsal segment (Which forms stapes), tympanohyal, stylohyal, epihyal and ceratohyal.