Fig. 4.
Suture internal morphology. For each coronal section, the ectocranial surface is toward the top. A) Interfrontal and B) interparietal suture from 3-month-old pig #298. The former was interdigitated while the latter was relatively butt-ended. C) Interfrontal and D) interparietal suture from 7-month-old pig #321. The interparietal suture was butt-ended throughout the entire suture, whereas the interfrontal suture remained interdigitated endocranially but became butt-ended ectocranially. E) Interparietal suture of 7-month-old pig #304 shows that fusion was ectocranial. The endocranial section remained patent. To scale: calibration bar, 1000 μm.