Basilar part of occipital bone

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Bone: Basilar part of occipital bone
Parsbasilaris(young).PNG
Occipital bone at birth.
Parsbasilaris(adult).PNG
Occipital bone. Outer surface.
Latin pars basilaris ossis occipitalis
Gray's subject #31 132
Dorlands
/ Elsevier
    
p_07/12616362

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 membrana tectoria.

On the lateral margins of this surface are faint grooves for the inferior petrosal sinuses.

Additional images

External links

This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant. Template:Skull


hu:Pars basilaris ossis occipitalis


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