The sphenoid bone is a butterfly-shaped bone located at the base of the skull, behind the orbits (eye sockets) and in front of the temporal bones. It is a central bone in the cranium, connecting the frontal, parietal, temporal, and occipital bones.
The sphenoid bone has several important features and functions. It is involved in the formation of the floor and sides of the orbits, and it also contains the optic canal, which allows the optic nerve and blood vessels to pass through to the eye. In addition, the sphenoid bone contains several important foramina (holes) that allow for the passage of nerves and blood vessels. These include the foramen rotundum, foramen ovale, foramen spinosum, and foramen lacerum.
The sphenoid bone also plays an important role in articulating with other bones in the skull. It has four pairs of processes that articulate with other bones, including the frontal bone, the parietal bones, the temporal bones, and the occipital bone. These articulations allow for the proper movement and stability of the skull.
The sphenoid bone is an important structure in the human body and plays a vital role in the structure and function of the skull. It is located at the base of the skull, behind the orbits and in front of the temporal bones, and is involved in the formation of the floor and sides of the orbits, as well as the passage of nerves and blood vessels. It also articulates with other bones in the skull to provide stability and movement.
There are four paranasal sinuses, each corresponding with the respective bone from which it takes its name: maxillary, ethmoid, sphenoid, and frontal. The surgery uses a trans-sphenoid approach to access the pituitary. It can cause fevers and pain. The greater wing's three foramen include the foramen ovale, foramen rotundum, and the foramen spinosum. Instruments pass through the sphenoid sinus or bone to access the sella turcica.
Sphenoid Wing Dysplasia In patients with a condition called neurofibromatosis type 1 characterized by discoloration of the skin as well as the development of tumors in the skin, brain, and other parts of the body , the sphenoid wings can become malformed due to improper cellular development. By Fig 3 — Bony landmarks of the sphenoid body. The frontal sinuses are pockets of space located above the orbit of each eye in the frontal bone. By the twenty-fifth year the sphenoid and occipital are completely fused. The body articulates with the ethmoid bone anteriorly, and it is here that the sinuses open up into the nasal cavity. . Like the nasal cavity, the sinuses are all lined with mucus.
It contains the largest of the paranasal sinuses, the maxillary sinus. Check out our Pterygoid processes Synonyms: Processus pterygoideus ossis sphenoidei The pterygoid processes are extensions of the basal surface of the sphenoid body. Paranasal sinus CT scan is a useful technique for the quick diagnosis of SSFB. When a fracture occurs, the foramen is damaged, which causes nerve injury. Most reported cases occurred in women or girls and are associated with facial or cranial birth defects. Dry air and dry sinuses can increase sinus pressure and cause headaches and throbbing pain.
Occasionally, these arise due to infection or certain head injuries. What does fluid in sphenoid sinus mean? Each portion of the sphenoid forms a portion of the skull. What is ethmoid sinusitis? The viscerocranium or facial bones supports the soft tissue of the face. Sinusitis is inflammation of a sinus caused by a bacterial infection that can follow a viral infection. Numerous structures pass through here to reach the bony orbit. Each portion of the sphenoid bone plays a role within the skull. The sphenoid bone is one of the most complex bones of the human body.
They contain the anterior and posterior clinoid processes respectively. This can lead to a wide range of symptoms, eventually leading to blindness if untreated. Bat shaped bone that is described as the keystone bone of the cranium because it articulates with the cranial bones. What are the symptoms of ethmoid sinusitis? She subsequently received her MFA in Creative Writing from Hamline University in 2016. What are the 22 bones of the skull? Where is the sinus cavity located? Major blood vessels and nerves pass through this space.
Between the pre- and postsphenoid there are occasionally seen the remains of a canal, the canalis cranio-pharyngeus, through which, in early fetal life, the hypophyseal diverticulum of the buccal The sphenoidal sinuses are present as minute cavities at the time of birth Onodi , but do not attain their full size until after puberty. Their anterior surfaces make up part of the posterior aspect of the lateral wall of the orbit. The sphenofrontal suture borders the frontal bone, the sphenoparietal suture borders the parietal bone, the sphenosquamosal borders the temporal bone, and the spheno-occipital suture forms the border with the occipital bone. What is the ethmoid bone made of? If not treated, the sinusitis can lead to meningitis and vision issues. The pituitary gland, which produces many different hormones that control other glands, is housed in the sphenoid bone. The upper aspect of the sphenoid body forms the sella turcica, housing the pituitary gland. Clinical Relevance — Ethmoid Fracture This may cause anosmia loss of sense of smell.
Fracture of the labyrinth — may allow communication between the nasal cavity and the orbit. The pituitary gland or hypophysis is a small gland about 1 centimeter in diameter or the size of a pea. Lesser Wing The lesser wing arises from the anterior aspect of the sphenoid body in a superolateral direction. The femur is the strongest bone in the body, and it is the longest bone in the human body. These form parts of the infratemporal fossa, which are gaps at the base of the skull that allow nerves and blood vessels to pass through. Dry air and dry sinuses can increase sinus pressure and cause headaches and throbbing pain. This type of surgery is known as endoscopic trans-sphenoidal surgery ETSS , and is the usual treatment of choice for pituitary adenomas.
The eight bones that protect the brain are called the cranium. The palatovaginal or pharyngeal canal contains the pharyngeal nerve. It helps form the walls of the eye socket, or orbital cavity, as well as the roof, sides, and interior of the nasal cavity. Which of the following are part of the sphenoid? The front-facing portion helps make up the nasal cavity, while its sides contribute to the formation of the optic canal, a tunnel that allows the optic nerve and ophthalmic artery to pass through. It separates the anterior cranial fossa from the middle cranial fossa. Sphenoid sinusitis occurs when fluid within the sinus becomes infected.