Floor View Skull Dorsum Sellae

In a properly positioned caldwell projection the ir is perpendicular to the orbitomeatal line oml and the x rays pass at an angle of 15 degrees from behind the head and exit at the nasion.

Floor view skull dorsum sellae.

Under angulation over angulation shifting of the anterior or posterior clinoid within the foramen indicate what towne. Enlargement with erosion of anterior cortex of dorsum sellae proceeds to the floor of the sella and may result in complete destruction of the dorsum. The dorsum sellae forms the posterior wall of the sella turcica which houses the pituitary gland. The projection is used to visualize the petrous part of the pyramids the dorsum sellae and the posterior clinoid processes which are visible in the shadow of the foramen magnum.

Together with the basilar part of the occipital bone it forms the clivus. The sella turcica latinfor turkish seat is a saddle shaped depression in the body of the sphenoid boneof the human skulland of the skullsof other hominidsincluding chimpanzees orangutansand gorillas. Laterally it articulates with the petrous apex of the petrous part of the temporal bone. The dorsum sellae is part of the sphenoid bone in the skull.

Together with the basilar part of the occipital bone it forms the clivus. The dorsum sellae will be projected under the foramen magnum. It serves as a cephalometric landmark. A pair of large bony processes that project laterally from the sphenoid bone and form the anterolateral floor of the cranium and the lateral walls of the skull.

Skull pa axial caldwell view. Posteriorly it articulates with the basilar part of the occipital bone and jointly forms the clivus. This is a caudally angled occipito frontal projection that demonstrates the floor of sella turcica. Erosion of anterior and posterior clinoids can be seen pituitary tumors e g.