Running from the middle of this line across either half of the nuchal plane is the inferior nuchal line. The squamous part (also called squama of occipital bone, occipital squama) of the occipital bone has an internal and an external surface. An approach for removal of brain, brain stem with spinal cord for autopsy and anatomical study Variant morphogenesis of squamous part of occipital bone in human skulls. The external surface is convex and presents midway between the summit of the bone and the foramen magnum a prominence, the external occipital protuberance and inion. squamous part. By disabling cookies, you may not view Vimeo videos.

Occipital bone, inner surface.

Occipital bone, inner surface. The external surface of the squama of the occipital bone features: The external occipital protuberance is a palpable bony projection in the middle of the occipital bone. The hypoglossal canal is a bony passage that originates from the lateral part of the occipital bone anterior to the foramen magnum and ends on the outer surface anterior to the occipital condyle. External surface. Posterior nuchal muscles are removed as well as squamous part of occipital bone is nibbled and removed in piece meal. Osteology > Axial skeleton >

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It stays always separated from the foramen magnum by a bony border depending to the lateral parts. They are composed of the areas around the occipital condyles. The external surface of the basioccipital features the pharyngeal tubercle. The inferior nuchal line is a transverse ridge on the external surface of the occipital bone between the superior nuchal line and the foramen magnum. From this protuberance the upper division of the cruciform eminence runs to the superior angle of the bone, and on one side of it (generally the right) is a deep groove, the sagittal sulcus, which lodges the hinder part of the superior sagittal sinus. The occipital bone (latin: os occipitale) is a single bone and consists of four parts that surround the foramen magnum. For some of them, your consent is necessary. The clivus is occupied by the medulla oblongata and pons. Occipital bone > vet-Anatomy is a veterinary atlas of anatomy based on veterinary imaging (MRI, CT, X-Rays) and medical illustrations, designed and created by professional anatomists and veterinary imaging specialists. We use cookies to guarantee the best experience on our website. That area of the squamous part, which lies above the highest nuchal lines is named the occipital plane (planum occipitale) and is covered by the occipitalis muscle.

Exceptions to this condition are, however, not infrequent: the left may be larger than the right or the two may be almost equal in size.
That below, termed the nuchal plane, is rough and irregular for the attachment of several muscles. Into the surface between the superior and inferior nuchal lines the semispinalis capitis and the obliquus capitis superior are inserted, while the inferior nuchal line and the area below it receive the insertions of the rectus capitis posterior major and minor. Squamous part is shown red. The internal surface is deeply concave and divided into four fossae by the cruciform eminence. In the attached margin of this falx is the occipital sinus, which is sometimes duplicated. Like other bones in your skull, the occipital bone is flat, and it has many attachments and features, which is why it is often described in parts. The groove for the transverse sinus is located bilaterally on the internal surface of the occipital bone extending from the internal protuberance to the lateral angles of the occipital bone.

Call for contributions (images and translations), Classifications in radiology & medical imaging. The groove on the right side is usually larger than that on the left and is continuous with that for the superior sagittal sinus. The internal occipital crest is a thick bony ridge on the internal surface of the occipital bone that occasionally extends from the internal occipital protuberance to the foramen magnum. Underside of the skull. In the image the lateral parts are not labeled.

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At the point of intersection of the four divisions of the cruciform eminence is the internal occipital protuberance.

Transverse grooves, one on either side, extend from the internal occipital protuberance to the lateral angles of the bone; those grooves accommodate the transverse sinuses, and their prominent margins give attachment to the tentorium cerebelli.

The angle of union of the superior sagittal and transverse sinuses is named the confluence of the sinuses, and its position is indicated by a depression situated on one or other side of the protuberance.

The internal surface of the basioccipital features the following structures: The clivus is a sloping medial surface of the basal part of the occipital bone behind the dorsum sellae, sloping downward to the foramen magnum. These parts are: the basilar part (Pars basilaris), which delimitates the foramen magnum with the lateral parts (Partes laterales), also called exoccipitals; the squamous part and the inetreparietal bone (Os interparietale) that is inserted between the two parietal bones.

The lower is termed the superior nuchal line.

The superior nuchal line is a transverse ridge on the external surface of the occipital bone at the level of the external occipital protuberance.

The squama, the expanded plate behind the foramen magnum, is situated above and behind the foramen magnum, is curved from above downward and from side to side. Extending lateralward from this on either side are two curved lines, one a little above the other. From the external occipital protuberance, an often faintly marked ridge or crest, the median nuchal line, descends to the foramen magnum and affords attachment to the nuchal ligament. ), This article incorporates text in the public domain from page 129 of the 20th edition of Gray's Anatomy (1918), https://en.wikipedia.org/w/index.php?title=Squamous_part_of_occipital_bone&oldid=948188623, Wikipedia articles incorporating text from the 20th edition of Gray's Anatomy (1918), Creative Commons Attribution-ShareAlike License, This page was last edited on 30 March 2020, at 16:56. Please contact. (Squamous part is top half, portion above foramen magnum. For questions regarding business inquiries. It stays always separated from the foramen magnum by a bony border depending to the lateral parts. Mobile and tablet users, you can download on Appstore or GooglePlay. When you browse the IMAIOS website, cookies are placed on your browser. The internal surface of the basioccipital features the following structures: clivus, Bones of the cranium > The hypoglossal canal transmits the hypoglossal nerve (CN XII) and a venous plexus. The squamous part of the occipital bone , the squama, is one of the five parts of the occipital bone. Click on each category of cookies to enable or disable their use. The squamous part of occipital bone, is situated above and behind the foramen magnum, and is curved from above downward and from side to side.
The groove for the sigmoid sinus is located in the posterior cranial fossa, found on the lateral part of the occipital bone, then curving around the jugular process on the mastoid part of the temporal bone, finally, turning sharply on the inner surface of the parietal bone, continuing as the transverse groove.

The groove for the superior sagittal sinus is a shallow depression on the frontal, parietal, and occipital bones forming a channel for the sagittal superior sinus; its margins come together as it passes downward and become continuous with the frontal crest. The squamous part of the occipital bone , the squama, is one of the five parts of the occipital bone. The internal surface of the squama of the occipital bone features: The internal occipital protuberance is a prominent midpoint of the cruciform eminence - a cross shaped bony prominence on the internal surface of the occipital bone. Squamous part is shown red. Squamous part of occipital bone. The posterior atlantooccipital membrane is attached around the postero-lateral part of the foramen magnum, just outside the margin of the foramen.

The internal surface of the lateral part of the occipital bone presents the groove for the sigmoid sinus. The upper, often faintly marked, is named the highest nuchal line, and to it the epicranial aponeurosis is attached. These cookies guarantee the proper functioning of the site, in particular the connection to your account (IMAIOS session cookies), site security (Google Recaptcha cookies) and online payment (Stripe cookies). Superior to the groove for the transverse sinus is a depression that accommodates the occipital brain lobes ( cerebral fossa ) and the corresponding inferior depression houses the cerebellum ( cerebellar … Human skull seen from below. These parts are: the basilar part (Pars basilaris), which delimitates the foramen magnum with the lateral parts (Partes laterales), also called exoccipitals; the squamous part and the inetreparietal bone (Os …


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