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]]