part of start stage end stage optic tectum periventricular grey zone periventricular gray zone Tissue located on the ventral side of the optic tectum, that contains the cell bodies of most tectal neurons. It is adjacent to the tectal ventricle and opposite the eminentia granularis of the cerebellum. It also contains a neurogenic niche and has hypothalamic inputs. The dendrites of neurons from the periventricular grey zones project their apical dendrites to the stratum opticum and stratum fibrosum et griseum superficale and synapse with retinal axons that project to these layers. TAO:0001352 PGZ ZFA:0000516 ZFA:0001352 SVP strata periventriculare TAO:0000516 periventricular grey zones stratum griseum periventricular stratum periventriculare zebrafish_anatomy periventricular layer portion of tissue multi-tissue structure hatching:long-pec adult