Posterior to the sella are the posterior clinoid processes, dorsum sellae, and interpeduncular cistern containing the basilar apex and cranial nerves III and IV. Inferiorly, the sella turcica has a thin floor of cortical bone, below which lies the sphenoid sinus.
What is the most posterior portion of the sella turcica called?
Figure 16. The most posterior is the sphenoid sinus, located in the body of the sphenoid bone, under the sella turcica.
What is above the sella turcica?
Since the sella turcica forms a bony caudal border for the pituitary gland, a pituitary tumor usually extends upward in the rostral direction into the suprasellar region. This can result in compression of the optic chiasm, which lies on top of the pituitary, enveloping the pituitary stalk.
What are the parts of the sella turcica?
- The tuberculum sella forms the anterior boundary of the sella.
- The pituitary fossa (hypophysial fossa) is the bony depression that houses the pituitary gland. …
- The dorsum sellae forms the posterior wall of the sella.
What processes are located anterior and posterior to the sella turcica?
Anterosuperior to the tuberculum is the sulcus chiasmaticus. The margins of the dorsum sellae form rounded structures called the posterior clinoid process. The anterolateral margin of the sella turcica forms the anterior clinoid process. These two clinoid processes aids in the attachment of the dural folds.
Which bone is the most posterior skull bone?
The occipital bone is the most posterior aspect of the skull. There are three cranial fossae with various structural landmarks. The anterior cranial fossa forms from the frontal bone, the sphenoid bone, and the ethmoid bone. The middle cranial fossa forms from the sphenoid bone and two temporal bones.
What is the back of the head called?
The occipital bone is a bone that covers the back of your head; an area called the occiput. The occipital bone is the only bone in your head that connects with your cervical spine (neck). The occipital bone surrounds a large opening known as the foramen magnum.
What bones articulate with the posterior aspect of the sphenoid bone?
It is one of the bones that make up the orbit, in particular, forming the posterior surface. The articulations of the sphenoid are with the frontal, parietal, ethmoid, zygomatic, temporal, occipital, palatine, and vomer bones.Is the sella turcica part of the ethmoid bone?
The most posterior is the sphenoid sinus, located in the body of the sphenoid bone, under the sella turcica. The ethmoid air cells are multiple small spaces located in the right and left sides of the ethmoid bone, between the medial wall of the orbit and lateral wall of the upper nasal cavity.
What bone is sella turcica in?Introduction: The sphenoid bone has a superior depression called the sella turcica, Latin for “Turkish saddle,” where the pituitary gland is found.
Article first time published onWhere is the posterior Clinoid process?
The posterior clinoid process (PCP) is a bony prominence located at the superolateral aspect of the dorsum sellae and can have a variable anatomical structure which is adjacent to the clivus.
How is sella turcica measured?
The length of sella turcica was measured as the distance from the tuberculum sella to the tip of the dorsum sellae. The depth of the sella turcica was measured as a perpendicular from the line above to the deepest point on the floor.
What is sella turcica and pituitary gland?
The sella turcica is a saddle-shaped depression located in the bone at the base of skull (sphenoid bone), in which resides the pituitary gland.
What is the sella turcica quizlet?
sella turcica. depression in the sphenoid bone where the pituitary gland is located. hypophyseal fossa. The Hypophyseal Fossa is “seat of the saddle” (Sella Turcica) part of the Sphenoid bone. It is the groove that is the deepest part of the body and it holds the Pituitary gland.
Which gland is located in the sella turcica quizlet?
Located at the base of the brain, the pituitary gland is protected by a bony structure called the sella turcica of the sphenoid bone.
Which gland is found in sella turcica?
The pituitary is a small gland located just underneath the brain. It is attached to the bottom of the brain by the pituitary stalk. The pituitary sits protected inside a saddle-like bony compartment in the base of the skull. This compartment is called the sella.
What is posterior scalp?
Posteriorly, the scalp receives innervation by the lesser and greater occipital nerves. The lesser spinal nerve originates from the cervical plexus and provides sensory innervation specifically to the scalp posterior to the ear in a lateral distribution.
What is base of skull called?
The base of skull, also known as the cranial base or the cranial floor, is the most inferior area of the skull. It is composed of the endocranium and the lower parts of the skull roof.
What is the back of the neck called?
The cervical spine – the neck and upper back, composed of the seven vertebrae closest to the skull. The cervical spine supports the weight and movement of your head and protects the nerves exiting your brain.
Which bones form the posterior lateral portion of the cranium?
The posterior surface of the petrous temporal bone and the lateral aspect of the occipital bone form the lateral wall. The occipital bone also fuses with the mastoid portion of the temporal bone to form the occipitomastoid suture.
What are the names of the bones that form the posterior portions of the hard palate?
(a) The hard palate is formed anteriorly by the palatine processes of the maxilla bones and posteriorly by the horizontal plate of the palatine bones.
What portion of the skull articulates to the lateral portion of the zygomatic bone?
The zygomatic bone has five borders: The anterosuperior (orbital) border is concave and smooth. It is the border between the lateral and orbital surfaces of the zygomatic bone. The anteroinferior (maxillary) border is the articular surface for the zygomaticomaxillary suture.
What is the name of the bony process posterior to the earlobe?
Posteriorly is the mastoid portion of the temporal bone. Projecting inferiorly from this region is a large prominence, the mastoid process, which serves as a muscle attachment site. The mastoid process can easily be felt on the side of the head just behind your earlobe.
What do you mean by sella turcica?
Listen to pronunciation. (SEL-uh TER-sih-kuh) A depression of the bone at the base of the skull where the pituitary gland is located.
Which cranial bone is anterior to the sphenoid and posterior to the nasal bones?
The frontal bone forms the anterior portion of the cranium, houses the frontal sinuses, and forms the roof of the ethmoid sinuses, nose, and orbit. Anteriorly, the external surface is convex superiorly, and it articulates with the parietal bones posteriorly and the greater wing of the sphenoid posteroinferiorly.
What is behind the sphenoid bone?
Borders. The sphenoid bone has a common border with the frontal bone (via the sphenofrontal suture), the parietal bone (via the the sphenoparietal suture), the squamous part of the temporal bone (via the sphenosquamosal suture) and the occipital bone (via the spheno-occipital suture).
Which portion of the embryonic skull contribute in development of the sphenoid bone?
The sphenoid bone is formed by the fusion of primordia of different embryonic origins. The orbito-sphenoid and the basi-post-sphenoid derive from the cephalic mesoderm whereas the alisphenoid and the basi-pre-sphenoid are from neural crest cell origin 5 (Figure 4).
What does sphenoid bone mean?
A butterfly-shaped bone at the base of the skull, behind the nose. The sphenoid bone helps form the eye socket.
What is another name for the sella turcica?
human skull portion of this seat, or sella turcica (“Turk’s saddle”), is actually wall-like and is called the dorsum sellae. The pituitary gland is thus situated in almost the centre of the cranial cavity.
Where is the posterior cranial fossa?
The posterior cranial fossa is part of the cranial cavity, located between the foramen magnum and tentorium cerebelli. It contains the brainstem and cerebellum. This is the most inferior of the fossae.
Why is the sella turcica known as the keystone bone?
Sella Turcica or “Turkish Saddle” is a support for pituitary gland; numerous foramina. Called the “keystone bone” because it articulates with all other cranial bones.
