======Occipitomastoid suture===== The occipitomastoid [[suture]] is the [[cranial suture]] between the [[occipital bone]] and the mastoid portion of the [[temporal bone]]. It is continuous with the [[lambdoid suture]]. Mastoid [[emissary vein]] is especially important from the neurosurgical point of view, because it is located in variable number in the area of the [[occipitomastoid suture]] and it can become a source of significant bleeding in surgical approaches through the [[mastoid process]], especially in [[retrosigmoid craniotomy]],