rhombic lip

rhom·bic lip

the thickened alar plate of the embryonic rhombencephalon.

rhombic lip

one of a pair of folds which develops to form the roof of the fourth ventricle.
References in periodicals archive ?
Antagonism between Notch and bone morphogenetic protein receptor signaling regulates neurogenesis in the cerebellar rhombic lip.
Granule cells, unipolar brush cells and cells of the (excitatory) cerebellar nuclei, all of which are excitatory neurons, are generated at the upper rhombic lip located at the dorsal edge of the cerebellar primordium.
The most prominent example of long distance tangential migration in the hindbrain comprises a subset of neurons that originate from the lower rhombic lip.
Likewise, in the cerebellar cortex, while VZ progenitors generate only inhibitory neurons, such as Purkinje cells and Golgi cells, (31) excitatory neurons such as granule cells and unipolar brush cells are generated in a neighboring germinal zone, the upper rhombic lip.
2005) Math1 expression redefines the rhombic lip derivatives and reveals novel lineages within the brainstem and cerebellum.
2006) Development of the deep cerebellar nuclei: transcription factors and cell migration from the rhombic lip.
The dorsal region spontaneously developed three layers along the dorsal-ventral axis: the ventricular zone, a Purkinje-cell precursor zone, and a rhombic lip zone.
In zebrafish, this means that cerebellar neurons have to migrate from the upper rhombic lip to the midbrain-hindbrain boundary and further.