Roof Of Sphenoid Sinus Ct

Additionally it provides useful preoperative information about anatomy.

Roof of sphenoid sinus ct.

Between the orbit and the nasal cavity within the ethmoid labyrinth of the ethmoid bone. Orbital process of the frontal bone anterior superior portion lesser wing of the sphenoid postero medial portion inferior wall. The anterior wall is shared with the posterior wall of the ethmoid sinus. Orbital process of the frontal bone orbital process of the zygomatic bone.

Superior orbital fissure lies between the lesser and the greater wing of sphenoid. These structures are often seen as indentations on the roof and walls of the sinus and can project into the lumen of the sinus endosinal in case of hyperpneumatization. It usually lies anteroinferior to the sella. Vertical height 2 2 cm.

Antero posterior depth 2 2 cm. Anterior and posterior ethmoidal and supraorbital nerves gross anatomy. Depending on the degree of pneumatization the roof posterior walls and lateral walls of the sphenoid sinus separate the sinus from the cranial vault. The two sinuses are separated by a septum which may or may not be in the midline.

The sphenoid sinuses are paired spaces formed within the body of the sphenoid bone communicating with the roof of the nasal cavity via the sphenoethmoidal recess in its anterior wall. This fissure allows the passage to the nerves iii iv vi branches of the v 1 and ophthalmic veins. They cannot be palpated during an extraoral examination. The sphenoid sinus is one of the four paired paranasal sinuses that is contained within the body of the sphenoid bone.

The sphenoid sinuses are located within the sphenoid bone posterior to the ethmoid sinuses. Dehiscence of the bony roof of the canal was found on the right side in 22 2 of the patients and on the left side in 26 6. We examined 100 consecutive routine ct scans 100 posterior fossa ct scans and 100 mr scans to look for evidence of sinus disease especially of the sphenoid sinus. The following are their average measurements.

The apertures are high on the anterior walls of the sphenoid sinuses. Sinusitis may be subdivided into acute 1 month subacute 1 3 months and chronic 3 months. A collection of air cells 3 18 in number separated by bony septa within each side of the lateral mass or. 14 the internal carotid artery is typically found at the posterolateral wall of the sphenoid sinus and in 22 of cases its bony covering may be dehiscent.

The optic nerve produces an anterosuperior indentation within the roof of the sphenoid sinus. Vidian canal types 1 2 and 3 based on the sphenoid sinus body were found on the right side in 33 8 29 7 and 6 5 and on the left side in 36 4 27 4 and 36 2 of the patients respectively. The sphenoid sinuses vary in size and shape and owing to the lateral displacement of the intervening septum which may insert on the carotid canal they are rarely symmetrical. Transverse breadth 2 cm.

In sinusitis a ct scan may provide information on the extent and possibly the mechanical cause. Supraorbital anterior and posterior ethmoidal and sphenopalatine arteries. The two sinuses are separated by a septum which may or may not be in the midline.