Fig 1.
Regional subdivisions of the chimpanzee corpus callosum from a midsagittal view.
The total CC midsagittal area was divided into seven equally spaced subdivisions: 1 = rostrum (red); 2 = genu (green); 3 = rostral body (yellow); 4 = anterior midbody (blue); 5 = posterior midbody (magenta); 6 = isthmus (cyan); 7 = splenium (white).
Fig 2.
An ontogenetic series of the regional subdivisions of the chimpanzee corpus callosum from a midsagittal view.
Regional subdivisions: 1 = rostrum (red); 2 = genu (green); 3 = rostral body (yellow); 4 = anterior midbody (blue); 5 = posterior midbody (magenta); 6 = isthmus (cyan); 7 = splenium (white). The bars below the figures indicate the developmental stage. The indicated developmental stages are infancy (open bar), the juvenile stage (hatched bar), and the adult stage (horizonal striped bar).
Fig 3.
Evaluation of the corpus callosum areas during development.
Age-related changes in the total CC and the CC subdivisions during infancy and the juvenile stage are shown for chimpanzees (n = 4) and humans (n = 72). (A) total, (B) rostrum, (C) genu, (D) rostral body, (E) anterior midbody, (F) posterior midbody, (G) isthmus, and (H) splenium. The bar below the graphs indicates the developmental stage. The indicated developmental stages are infancy (open bar) and the juvenile stage (hatched bar).
Fig 4.
Evaluation of the normalized corpus callosum areas during development.
Age-related changes in the total CC and the CC subdivisions relative to the adult areas during infancy and the juvenile stage are shown for chimpanzees (n = 4) and humans (n = 72). (A) total, (B) rostrum, (C) genu, (D) rostral body, (E) anterior midbody, (F) posterior midbody, (G) isthmus, and (H) splenium. The bar below the graphs indicates the developmental stage. The indicated developmental stages are infancy (open bar) and the juvenile stage (hatched bar).
Table 1.
Sample characteristics of the corpus callosum areas in chimpanzees.
Table 2.
Sample characteristics of the corpus callosum areas relative to adult areas (normalized areas) in chimpanzees.
Table 3.
Results of polynomial regression modeling of the developmental trajectories of the corpus callosum areas.
Table 4.
Sample characteristics of the corpus callosum areas in humans.
Table 5.
Sample characteristics of the corpus callosum areas relative to adult areas (normalized areas) in humans.
Table 6.
Differences in normalized areas among CC subdivisions in chimpanzees.
Table 7.
Differences in normalized areas among CC subdivisions in humans.