The occipitotemporal/occipitomastoid suture is the obliquely directed point of convergence of the anterior margin of the squamous occipital bone and the mastoid part of the temporal bone. Sometimes, a mastoid foramen is located near or inside it.
Occipitomastoid Suture
At the asterion, the occipitotemporal suture and the parietotemporal suture merge the lateral end of the lambdoid suture, which in the fetal/neonatal skull is the site of the posterolateral fontanel, which closes throughout the second year of life. A small triangular zone referred the jugular growth plate is the last part of the skull to show active age-related growth and is located posterolateral towards the jugular foramen in the occipitotemporal suture.
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