Otic vesicle constricts to form the canalis reuniens. The central part of the otic vesicle represents the membranous vestibule, and is subdivided by a constriction into a smaller ventral part, the saccule, and a larger dorsal and posterior part, the utricle. The dorsal component of the inner ear also consists of what will become the semicircular canals. The utricle and saccule communicate with each other by means of a Y-shaped canal. The FGF, Bmp, Wnt and Pax genes are likely to be involved in otic induction. FGF and BMP signals help control patterning in the early otic vesicle. Fgf3 and Fgf10 are
Crown (anatomy) crown and occiput, is sometimes called the pileum. A bird with a crest covering the pileum may be described as "pileated", e.g. the pileated woodpecker. In whale anatomy the crown is the bulge on the head through which the blow-holes emerge. Crown (anatomy) The crown is the top of the head, or the whole head. Crown can mean the top of the head and it can also mean the whole head. In the study of human anatomy the terms "Calvaria, "skullcap", "skull cap", or the "roof of the cranial cavity" are used for the top part of the head. In