Occipital Bone, Posterior View

Description

Posterior calvarial anatomy is the intended subject, with the squamous part of the occipital bone forming the inferior portion of the cranial vault in a male skull. The external occipital protuberance (inion) sits on the midline, with the superior nuchal lines running laterally from it and the inferior nuchal lines coursing below, separated by the external occipital crest. Superiorly, the lambdoid suture would border the parietal bones, while the mastoid regions of the temporal bones lie inferolaterally toward the occipitomastoid suture. Midline landmarks dominate this view. This posterior surface matters because it anchors the ligamentum nuchae and key cervical and suboccipital muscles, including trapezius at the medial superior nuchal line and semispinalis capitis near the inferior nuchal line. Palpation of the inion and nuchal lines guides surface anatomy for posterior approaches, and the occipital region is a common site of contusion and laceration in falls where the head strikes posteriorly. Fracture patterns here can propagate toward the lambdoid suture and posterior cranial fossa, with potential relevance to dural venous sinus injury near the midline. Use this artwork for gross anatomy teaching on the cranium, osteology labs emphasizing palpable landmarks, and surgical or emergency medicine materials discussing posterior scalp trauma and skull fracture localization. It also fits atlas plates that pair posterior cranial bone markings with muscle attachment diagrams for the neck and upper back. Anatomical accuracy verified by SciePro's Medical Advisory Board.