The fornix, mamillary bodies, and part of the anterior commissure can also be seen. |
The corpus callosum is not formed till after the anterior commissure and fornix. |
The average M1-M2 angle was 38° with functional opening of the first commissure. |
The anterior white commissure is formed very shortly after the first appearance of the white matter. |
The upper lip largely covering the lower lip the lower lip with slak mucous membranes forms a very loose labial commissure. |
At their commissure, the lips should initiate a very slight pouch which should stay firm. |