Two pairs of bony plates, the pterygoid processes, arise from the base of each alisphenoid bone. The outer plates are nearly horizontal in position. They extend from the posterior end of the maxillary bone caudad and laterad to the lateral surface of the tympanic bulla.
What are the Pterygoid processes?
The pterygoid processes or pterygoid plates are paired posteroinferior projections of the sphenoid bone.
Where are the Pterygoid processes located relative to the mandible?
The pterygoid muscles are two of the four muscles of mastication, located in the infratemporal fossa of the skull. These muscles are: lateral pterygoid and medial pterygoid. The primary function of the pterygoid muscles is to produce movements of the mandible at the temporomandibular joint.
Where is the pterygoid process of sphenoid bone?
The pterygoid process descends inferiorly from the point of junction between the sphenoid body and the greater wing. It consists of two parts: Medial pterygoid plate – supports the posterior opening of the nasal cavity.What is the Pterygoid region?
The pterygoid fossa is an anatomical term for the fossa formed by the divergence of the lateral pterygoid plate and the medial pterygoid plate of the sphenoid bone.
Where is the sella turcica located?
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.
Where is the pterygoid process of the skull located quizlet?
The anterior process is the lesser wing of the sphenoid bone, which comprises of the base of the orbital apex, the posterolateral process is the greater wing of the sphenoid bone and inferiorly to the greater wing of the sphenoid bone is the pterygoid process, an area of attachment of some muscles of mastication.
Where is sphenoid located?
There are 22 bones that make up the skull, and the sphenoid (don’t you just love saying it?) is one of the 8 bones of the neurocranium. It is situated at the base of the skull, acting as the keystone.What is located in the sella turcica of sphenoid bone?
The sella turcica is a midline depression in the sphenoid bone which contains the pituitary gland and distal portion of the pituitary stalk.
Where does the pterygoid plexus drain into?Drains fromVenules of the infratemporal fossaDrains toMaxillary vein
Article first time published onWhere is the pyramidal process of palatine bone?
The pyramidal process of the palatine bone arises from the junction between the horizontal and perpendicular plates. It is oriented posterolaterally, passing between the medial and lateral pterygoid plates of the sphenoid bone.
What Innervates medial pterygoid?
Medial pterygoid muscle is innervated by the medial pterygoid branches of mandibular nerve (CN V3), one of the three divisions of trigeminal nerve (CN V).
Is pterygoid a skull bone?
The pterygoid is a paired bone forming part of the palate of many vertebrates, behind the palatine bones. It is a flat and thin lamina, united to the medial side of the pterygoid process of the sphenoid bone, and to the perpendicular lamina of the palatine bone.
Where does the lateral pterygoid attach?
OriginSuperior head: Infratemporal crest of greater wing of sphenoid bone Inferior head: Lateral surface of lateral pterygoid plate of sphenoid boneInsertionSuperior head: Joint capsule of temporomandibular joint Inferior head: Pterygoid fovea on neck of condyloid process of mandible
What passes through the pterygoid fossa?
The pterygoid canal is located on the posterior wall of the pterygopalatine fossa, between the foramen rotundum and the palatine canal. It communicates with the middle cranial fossa and from there, it transmits the nerve, artery, and vein of the pterygoid canal.
Which Bones has Pterygoid processes and the optic canal?
Pterygoid processes of the sphenoidSphenoid bone, anterior and inferior surfaces.DetailsIdentifiersLatinprocessus pterygoideus ossis sphenoidalis
Which of the following bones and their processes form the hard palate?
Which of the following bones and their processes form the hard palate? Horizontal plates of the palatine bones and palatine processes of the maxillae.
Where is the zygomatic arch located?
zygomatic arch, bridge of bone extending from the temporal bone at the side of the head around to the maxilla (upper jawbone) in front and including the zygomatic (cheek) bone as a major portion.
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.
What is the sella turcica where is located Why is important?
Sella turcica and pituitary gland. The sella turcica (Latin for Turkish saddle) is a saddle-shaped depression in the body of the sphenoid bone of the human skull and of the skulls of other hominids including chimpanzees, gorillas and orangutans. It serves as a cephalometric landmark.
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 sinus is in the sella turcica?
The Sphenoid Sinus. The pituitary gland resides in the sella turcica whose floor is surrounded by the body of the sphenoid bone.
Which endocrine gland rests in the sella turcica of sphenoid bone?
The pituitary gland or hypophysis is a small gland about 1 centimeter in diameter or the size of a pea. It is nearly surrounded by bone as it rests in the sella turcica, a depression in the sphenoid bone. The gland is connected to the hypothalamus of the brain by a slender stalk called the infundibulum.
What sinus is below the sella turcica?
The sphenoidal sinuses are contained within the body of the sphenoid bone beneath the sella turcica.
Where is maxilla located?
The maxilla is the bone that forms your upper jaw. The right and left halves of the maxilla are irregularly shaped bones that fuse together in the middle of the skull, below the nose, in an area known as the intermaxillary suture.
What is the location of the ethmoid bone?
The ethmoid bone is an unpaired cranial bone that is a significant component of the upper nasal cavity and the nasal septum. The ethmoid bone also constitutes the medial orbit wall.
Which bones does not contain paranasal sinuses?
The skull bone that does NOT contain a paranasal sinus is the b. parietal.
Where does the maxillary vein drain?
It is formed from the merging of the veins of the pterygoid plexus, and the interpterygoid emissary vein. It passes posteriorly between the sphenomandibular ligament and the neck of the mandible. It unites with the superficial temporal vein. It drains into the retromandibular vein (posterior facial vein).
What does the facial vein drain into?
The facial vein (along with the facial artery) pierces the deep investing fascia of the neck just below the border of the mandible where it unites with the anterior branch of the retromandibular vein to form the common facial vein, which empties into the internal jugular vein 1,2,3.
Which vein does not join the pterygoid plexus of veins?
The pterygoid plexus of veins becomes the maxillary vein. The maxillary vein and the superficial temporal vein later join to become the retromandibular vein.
Which processes does the palatine bone have?
Each palatine bone somewhat resembles the letter L, and consists of a horizontal plate, a perpendicular plate, and three projecting processes — the pyramidal process, which is directed backward and lateral from the junction of the two parts, and the orbital and sphenoidal processes, which surmount the vertical part, …
