Basilar part of occipital bone 4615435 172762971 2007-11-20T20:06:00Z DorganBot 2844817 robot Modifying: [[hu:Pars basilaris ossis occipitalis]] {{Infobox Bone | Name = Basilar part of occipital bone | Latin = pars basilaris ossis occipitalis | GraySubject = 31 | GrayPage = 132 | Image = Parsbasilaris(young).PNG | Caption = [[Occipital bone]] at birth. | Image2 = Parsbasilaris(adult).PNG | Caption2 = Occipital bone. Outer surface. | System = | MeshName = | MeshNumber = | DorlandsPre = p_07 | DorlandsSuf = 12616362 | }} The '''basilar part''' of the [[occipital bone]] extends forward and upward from the [[foramen magnum]], and presents in front an area more or less quadrilateral in outline. In the young skull this area is rough and uneven, and is joined to the body of the [[sphenoid]] by a plate of cartilage. By the twenty-fifth year this cartilaginous plate is ossified, and the occipital and sphenoid form a continuous bone. == Surfaces == On its ''lower surface'', about 1 cm. in front of the foramen magnum, is the [[pharyngeal tubercle]] which gives attachment to the fibrous [[raphé]] of the [[pharynx]]. On either side of the middle line the [[Longus capitis]] and [[Rectus capitis anterior]] are inserted, and immediately in front of the [[foramen magnum]] the [[anterior atlantoöccipital membrane]] is attached. The ''upper surface'' presents a broad, shallow groove which inclines upward and forward from the foramen magnum; it supports the [[medulla oblongata]], and near the margin of the foramen magnum gives attachment to the [[Tectorial membrane (axis) | membrana tectoria]]. On the lateral margins of this surface are faint grooves for the [[inferior petrosal sinus]]es. ==Additional images== <gallery> Image:Gray307.png|Membrana tectoria, transverse, and alar ligaments. Image:Gray387.png|The anterior vertebral muscles. </gallery> ==External links== * {{SUNYAnatomyLabs|22|os|09|13}} {{Gray's}} {{Skull}} {{musculoskeletal-stub}} [[hu:Pars basilaris ossis occipitalis]]