Human brain development timeline

Day	Event	Reference
33	posterior commisure appears	Ashwell et al. (1996)
33	medial forebrain bundle appears	Ashwell et al. (1996)
44	mammillo-thalamic tract appears	Ashwell et al. (1996)
44	stria medullaris thalami appears	Ashwell et al. (1996)
51	axons in optic stalk	Dunlop et al. (1997)
56	external capsule appears	Ashwell et al. (1996)
56	stria terminalis appears	Ashwell et al. (1996)
60	optic axons invade visual centers	Dunlop et al. (1997)
63	internal capsule appears	Ashwell et al. (1996)
63	fornix appears	Ashwell et al. (1996)
70	anterior commisure appears	Ashwell et al. (1996)
77	hippocampal commisure appears	Ashwell et al. (1996)
87.5	corpus callosum appears	Ashwell et al. (1996)
157.5	eye opening	Kurjak et al. (2004); Campbell et al. (2005)
175	ipsi/contra segregation in LGN and SC	Robinson and Dreher (1990)

References

Ashwell, K.W., Waite, P.M. and Marotte, L., 1996. Ontogeny of the projection tracts and commissural fibres in the forebrain of the tammar wallaby (Macropus eugenii): timing in comparison with other mammals. Brain Behav. Evol. 47, pp. 8–22.
Dunlop, S.A., Tee, L.B., Lund, R.D. and Beazley, L.D., 1997. Development of primary visual projections occurs entirely postnatally in the fat-tailed dunnart, a marsupial mouse, Sminthopsis crassicaudata. J. Comp. Neurol. 384, pp. 26–40.
Robinson, S.R. and Dreher, B., 1990. The visual pathways of eutherian mammals and marsupials develop according to a common timetable. Brain Behav. Evol. 36, pp. 177–195.