The development of corticocollicular projections in anophthalmic mice

Maha Y. Khachab, Laura Bruce

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

To determine the role of retinal axons in the development of the corticocollicular projection in mice, the lipophilic fluorescent dye, DiI, was used to compare the development of the cortical projections in phenotypically normal (C57BL/6J) mice to that of anophthalmic 129SV/CPor(J) mice. Cortical axons in anophthalmic mice found their targets and established a laminar specificity similar to those of cortical axons in normal mice despite the absence of the retinal projection. Cortical axons in normal mice reached the superior colliculus before those in anophthalmic mice and also had a faster rate of growth within the colliculus. Unlike cortical axons in normal mice in early postnatal ages, those in anophthalmic mice formed a disperse bundle in the stratum opticum. Axons labeled by focal applications of DiI into area 17 terminated in a larger and more medial area in anophthalmic mice than in normal mice. Thus, retinal axons are not essential for cortical axons to reach the superior colliculus, but they may have a role in organizing the growth of later-arriving cortical axons. Furthermore, cortical axons can terminate in the superior colliculus with a coarse topography when retinal axons are absent, but they cannot form a topographically refined projection.

Original languageEnglish
Pages (from-to)179-192
Number of pages14
JournalDevelopmental Brain Research
Volume114
Issue number2
DOIs
StatePublished - May 14 1999

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Axons
Superior Colliculi
Growth
Inbred C57BL Mouse
Fluorescent Dyes

All Science Journal Classification (ASJC) codes

  • Developmental Biology
  • Developmental Neuroscience

Cite this

The development of corticocollicular projections in anophthalmic mice. / Khachab, Maha Y.; Bruce, Laura.

In: Developmental Brain Research, Vol. 114, No. 2, 14.05.1999, p. 179-192.

Research output: Contribution to journalArticle

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