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Zebrafish Anatomical Dictionary


Structure description: sensory patches of the ear

by Tanya Whitfield

Name: sensory patches of the ear

Abbreviation: : am, pm, anterior and posterior maculae; ac, lc, pc, anterior, lateral and posterior cristae

Synonyms: anterior macula, posterior macula (also known as the posteromedial macula), cristae

Figures:

4 day ear
Sensory patches
bmp4/msx expression

Dissected ears
Anterior macula polarities

Lateral crista polarities
Posterior macula polarities

Description: Patches of thickened, pseudostratified epithelium of the inner ear, consisting of regular arrays of sensory hair cells interspersed with supporting cells. Each patch has its own charcteristic shape and polarity pattern. The anterior macula is rounded. At 5 days of development, the hair cell polarity pattern of the anterior macula resembles that of the adult utricle (Platt, 1993), with most hair cells radiating out laterally from a medial point, and a rim of hair cells around the lateral edge of the macula pointing medially. The day 5 posterior macula has a rounded posterior section and a slim anterior projection. At this stage, in the anterior projection, hair cells are arranged in an antiparallel fashion, while in the posterior region of the macula, hair cells point away from a midline separating dorsal and ventral halves. This is the "standard" four-quadrant pattern for a teleost sacculus (Popper et al., 1982), but the adult zebrafish sacculus has been described to have a "vertical" pattern, i.e. lacking the anterior region of antiparallel organisation (Platt, 1993). The anterior and posterior cristae are saddle shaped; the lateral crista, at day 4 and 5, is triangular, with a few hair cells separated from, and lying medial to, the apex of the triangle. Hair cells within a crista all point in the same direction.

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Parents (forms from): cranial placodal ectoderm (otic placode)

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