Age-related changes in the ultrastructural morphology in the auditory cortex.

<p>Ultrastructural changes in the auditory cortex at different ages in the NS and D-Gal groups. Normal nucleus, uniformly chromatin, and normal mitochondria (white asterisks) are shown in the 4- and 10-month-old NS group and the 4-month-old D-Gal group, irregular nucleus, condensed chromatin, and swollen and vacuolated mitochondria (black asterisks) were found in the 18-month-old NS group, 10- and 18-month-old D-Gal group. Intact and compact myelin (white arrows) was in the 4- and 10-month-old NS group, swollen and disrupted myelin (black arrows) was in the 18-month-old NS group and different D-Gal groups. Enlarged endoplasmic reticulum was found in the 18-month-old NS group. Accumulated lipofuscin (white arrowheads) were shown in the D-Gal groups.