The success rates for all these different treatment possibilities seem to be similar. It forms the palatopharyngeal arch at the fauces black ring. In many animals it is a separate bone called the. At the inferior tip of the medial pterygoid plate is the small hook-shaped process, the pterygoid hamulus. These muscles play an essential role in suckling.
Each lateral surface unites with the greater wing and the pterygoid process of the sphenoid, and has an important feature, the carotid groove. In the squamates, the oral cavity, pharynx and tympanic cavity medial to the eardrum form a continuous space. In carnivorous non-mammalian cynodonts such as Thrinaxodon, Probelesodon and Probainognathus, extensive wear facets are absent on the postcanine teeth. The maxillary surface of the greater wing of the sphenoid faces anteriorly, forms the posterior border of the pterygopalatine fossa, and is pierced by the foramen rotundum. Its lateral surface forms part of the medial wall of the infratemporal fossa, and gives attachment to the ; its medial surface forms part of the pterygoid fossa, and gives attachment to the.
The superior pharyngeal constrictor muscle attaches to the inferior end of this plate. The lateral surface of this plate forms part of the , the medial surface constitutes the lateral boundary of the or posterior aperture of the corresponding nasal cavity. The sella turcica turkish saddle is a saddle-shaped depression on the body of the sphenoid, which lies above the sphenoidal sinus and contains the hypophysis pituitary gland. The anterior clinoid process is a cone-like process of the sphenoid on either side of the anterior part of the hypophysial fossa. This not true for typical reptiles where food is not broken down by repeated jaw closings.
The chiasmatic groove is a groove between the right and left optic canals. Pterygoid implants present an alternative option to use residual bone for implant anchorage and to overcome the need for augmentation procedures. The anterior clinoid processes arise from the sphenoidal lesser wings, while the posterior clinoid processes are the superolateral projections of the dorsum sellae. The image above compares the palatal region of one such cynodont and a mammal, the opossum. The taxon illustrated above is Pachygenelus.
This view has been widely accepted, but as the ectopterygoid is lost in all advanced cynodonts, it is unlikely. They are attachment sites for the tentorium cerebelli dura mater , which separates the cerebellum from the inferior occipital lobes of the brain. The medial border of the optic canal is formed by the body of the sphenoid. It is important to note that the oropharyngeal region is divided into several compartments: oral cavity, oropharynx, nasopharynx and Eustachian tube. The temporal surface of the greater wing of the sphenoid is the attachment site for the temporalis muscle. If you do not agree to the foregoing terms and conditions, you should not enter this site. It contains the sphenoidal sinuses, which are separated by a septum — meaning that the sphenoid body is essentially hollow.
Greater Wing The greater wing extends from the sphenoid body in a lateral, superior and posterior direction. Nevertheless this can be avoided by inserting the implant just at the level of the tuberosity. In this mid-sagittal section through the skull of the same early cynodont above, top right , the pterygo-palatine ridge red is shown supporting a soft palate shown in yellow that formed the floor to a relatively shallow nasopharynx. Roche Lexicon - illustrated navigator. Superiorly the medial plate is prolonged on to the under surface of the body as a thin lamina, named the vaginal process, which articulates in front with the of the palatine and behind this with the ala wing of the. The arterial grooves are located on the inner surface of the skull produced by pressure from arteries, primarily the middle meningeal artery and its branches.
Each process consists of a and a , the latter of which serve as the origins of the and. Relations Due to its relations give a reasonable knowledge about the arrangement of structures in this zone, the lateral pterygoid is considered to be the main muscle of the infratemporal zone. The carotid groove is a longitudinal groove lateral to the body of the sphenoid bone that houses the internal carotid artery. The lateral aspect of the lateral pterygoid plate forms the medial wall of the. We suggest that the medial part of the reptilian pterygoideus migrated from the posterior edge of the transverse process of the pterygoid into this concavity and probably lapped over the ventral edge of the pterygopalatine ridge to enter a soft palate as the tensor veli palatini muscles as it does in mammals. Each greater wing of the sphenoid has five surfaces: cerebral, two parts of the lateral surface - temporal and infratemporal, maxillary, and orbital surfaces.
The septum of the sphenoidal sinuses is a bony partition separating the two sphenoidal sinuses. Body of sphenoid The body of the sphenoid or sphenoid body is the central portion of the sphenoid bone located between the wings and processes of the sphenoid, and housing the sphenoidal sinuses. The upper edge of the orbital surface of the greater wing articulates with the orbital plate of the frontal bone, while the lateral margin articulates with the zygomatic bone. It separates the anterior cranial fossa from the middle cranial fossa. The opening of the sphenoidal sinus is an aperture that opens anteriorly into the nasal cavity, specifically, into a small space called the spheno-ethmoidal recess. The lateral surface of the greater wing of the sphenoid is convex and divided by a transverse infratemporal crest into a temporal and infratemporal surface.
The medical information on this site is provided as an information resource only, and is not to be used or relied on for any diagnostic or treatment purposes. The lesser wings are flattened, triangular in shape, and located above and anterior to the greater wings. Articulations The sphenoid is an unpaired bone. Body The body lies at the centre of the sphenoid bone, and is almost completely cubical in shape. The angular prominence between the posterior margin of the vaginal process and the medial border of the is named the pterygoid tubercle, and immediately above this is the posterior opening of the.