FIG 4. Myelination is shown in the sites that myelinate at term-equivalent age.

A, Transverse inversion recovery fast spin-echo image of an infant at 41 weeks gestational age, who was born at 28 weeks gestational age, shows myelin in the corticospinal tracts of the precentral and postcentral gyri as high signal intensity (arrowhead).

B, Transverse inversion recovery fast spin-echo image of an infant at 41 weeks gestational age, who was born at 28 weeks gestational age, shows myelin in the corona radiata as high signal intensity (arrow).

C, Transverse inversion recovery fast spin-echo image at the level of the basal ganglia of an infant at 42 weeks gestational age, who was born at 28 weeks gestational age, shows myelin in the posterior limb of the internal capsule as high signal intensity (arrow).

D, Transverse T2-weighted fast spin-echo MR image at the level of the mesencephalon of an infant at 36 weeks gestational age, who was born at 28 weeks gestational age, shows myelin in the medial geniculate body (long arrow), the lateral geniculate body (arrowhead), and the subthalamic nuceli (short arrow) as low signal intensity.