FIG 3. Myelin is shown in numerous gray and white matter structures in the preterm brain on T2-weighted fast spin-echo MR images.

A, Transverse T2-weighted fast spin-echo MR image of an infant at 25 weeks gestational age shows myelin in the region of the gracile and cuneate nuclei as low signal intensity (arrow).

B, Transverse T2-weighted fast spin-echo MR image of an infant at 28 weeks gestational age shows myelin in the cerebellar vermis (long arrow), dentate nucleus of the cerebellum (curved arrow), vestibular nuclei (white arrowhead), inferior olivary nuclei (black arrowhead), and inferior cerebellar peduncle (short arrow) as low signal intensity.

C, Transverse T2-weighted fast spin-echo MR image of an infant at 29 weeks gestational age shows myelin in the superior cerebellar peduncles (arrow) as low signal intensity.

D, Transverse T2-weighted fast spin-echo MR image of an infant at 30 weeks gestational age shows myelin in the medial lemnisci (arrow) as low signal intensity.

E, Transverse T2-weighted fast spin-echo MR image of an infant at 29 weeks gestational age shows myelin in the lateral lemnisci (arrow) as low signal intensity.

F, Transverse T2-weighted fast spin-echo MR image of an infant at 30 weeks gestational age shows myelin in the decussation of the superior cerebellar peduncles (arrowhead) and inferior colliculi (arrow) as low signal intensity.

G, Transverse T2-weighted fast spin-echo MR image of an infant at 29 weeks gestational age shows myelin in the subthalamic nuclei as low signal intensity (arrow).

H, Transverse T2-weighted fast spin-echo MR image of an infant at 29 weeks gestational age shows myelin in the medial geniculate bodies (arrow) as low signal intensity.

I, Transverse T2-weighted fast spin-echo MR image of an infant at 27 weeks gestational age shows myelin in the ventrolateral nuclei of the thalamus as low signal intensity (arrow).

J, Coronal T2-weighted fast spin-echo MR image of an infant at 27 weeks gestational age shows myelin in the inferior colliculi (arrow) as low signal intensity.