Development of the laminar distribution of thalamocortical axons and corticothalamic cell bodies in the visual cortex of the wallaby

The distribution of afferents from the dorsal lateral geniculate nucleus (LGNd) and the lateral posterior nucleus (LP) and of cell bodies projecting to these nuclei has been studied in the visual cortex of the wallaby (Macropus eugenii) throughout development to determine how the characteristic laminar distribution of afferents and efferents of the mature cortex is achieved. Young are born after 26–28 days of gestation and do not Open their eyes until around 140 days after birth. Horseradish peroxidase conjugated to wheatgerm agglutinin was injected in the visual thalamus in adults and in pouch young aged from 22 days after birth, just after thalamic axons first reach the visual cortex, to 118 days, when cortical lamination resembles the adult.

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