Cruciform eminence
Encyclopedia
The internal surface of the occipital bone
is deeply concave and divided into four fossæ by a cruciform eminence ( or cruciate eminence).
The superior and inferior fossae are separated by a transverse groove
. At the point of intersection between all four fossae is the internal occipital protuberance
.
Occipital bone
The occipital bone, a saucer-shaped membrane bone situated at the back and lower part of the cranium, is trapezoidal in shape and curved on itself...
is deeply concave and divided into four fossæ by a cruciform eminence ( or cruciate eminence).
- The superior two fossaeFossa (anatomy)In anatomical terminology, fossa has come to mean a depression or hollow, in general, in a bone. Other parts of the body may be involved, for example, the antecubital fossa...
are triangular and lodge the occipital lobes of the cerebrum. - The inferior two are quadrilateral and accommodate the hemispheres of the cerebellumCerebellumThe cerebellum is a region of the brain that plays an important role in motor control. It may also be involved in some cognitive functions such as attention and language, and in regulating fear and pleasure responses, but its movement-related functions are the most solidly established...
.
The superior and inferior fossae are separated by a transverse groove
Groove for transverse sinus
Along the internal surface of the occipital bone, running laterally between superior and inferior fossae of the cruciate eminence is the groove for transverse sinus. The transverse sinuses travel along this groove.-External links:*...
. At the point of intersection between all four fossae is the internal occipital protuberance
Internal occipital protuberance
Along the internal surface of the occipital bone, at the point of intersection of the four divisions of the cruciate eminence is the internal occipital protuberance. Running transversely on either side is a groove for the transverse sinus.-External links:*...
.