Table 4.

The temporal sequence and main features of the microglial clusters in the diencephalon and ventral telencephalon.

Age (gw)	Microglial clusters	Main features
5.5–6	1a, 2	No contact with vessel walls, some proliferation
7–11	1a,b, 2, 3a,b	Slight contact with vessel walls, increasing proliferation
12	1a,b, 2, 3a,b	Contact with vessel walls, extension into the white matter, marked proliferation in microglial clusters
14–17	1a,b, 2, 3a,b,c, 4a,b	Contact with vessel walls, extension into the white matter, no proliferation
18–23	1a,b, 2, 3a,b,c, 4a,b	Dispersion in the grey matter, no proliferation
19–30	Axonal crossroads	Proliferation, accumulation in the semi-ovale centre