The sphenoid is an unpaired bone. It sits
anteriorly in the cranium
, and contributes to the middle cranial fossa, the lateral wall of the skull, and the floor and sides of both orbits. It has articulations with twelve other bones: Unpaired bones – Occipital, vomer, ethmoid and frontal bones.
What is the sphenoid bone function?
Sphenoid bone has many essential functions. It
helps form the base and lateral sides of the skull in combination with the orbital floor
. Its many articulations with other bones give the skull rigidity. It is an attachment site for many of the muscles of mastication. A portion of the sphenoid forms the facial skeleton.
What is the body of the 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 sphenoid body has six surfaces: superior, posterior, anterior, inferior, and two lateral surfaces.
How many sphenoid do we have?
Importance of the Sphenoid
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.
Where are the sphenoid and ethmoid bones located?
The sphenoid and ethmoid bones located
to the front of the skull form parts of the orbital sockets and nasal cavity
; they also support and protect key organs found in the skull.
How do you know if you have a sphenoid bone?
- Floor of the middle cranial fossa.
- Lateral wall of the skull.
- Posterolateral wall of the orbit.
Does the sphenoid bone move?
The movement between the sphenoid and the occiput has long been considered a primary focus in cranial therapeutics. … Sutherland and later presented in books by Magoun and Upledger, the following movements occur between the sphenoid and occiput near or at the sphenobasilar junction:
Flexion/Extension
.
What muscles attach to the sphenoid?
On the base of the sphenoid bone, several muscles attach to it’s legs,
the medial and lateral pterygoid processes
. As the name suggests, the pterygoid muscles, important for chewing and mastication, attach here.
Is sphenoid a facial bone?
The viscerocranium or facial bones supports the soft tissue of the face. The viscerocranium consists of 14 individual bones that fuse together. However, the hyoid bone, ethmoid bone, and sphenoid bones are sometimes included in the viscerocranium.
What nerves pass through sphenoid bone?
The
oculomotor, trochlear, and abducens nerves
; the first division of the trigeminal nerve; and the optic vein pass through the superior orbital fissure. The borders of the superior orbital fissure are the ala minor and major, and medially the body of the sphenoid bone.
What is the purpose of the sphenoid sinuses?
A type of paranasal sinus (a hollow space in the bones around the nose). There are two large sphenoid sinuses in the sphenoid bone, which is behind the nose between the eyes. The sphenoid sinuses are lined with
cells that make mucus to keep the nose from drying out
.
How many sphenoid sinuses are there?
Sinuses are air-filled sacs (empty spaces) on either side of the nasal cavity that filter and clean the air breathed through the nose and lighten the bones of the skull. There are
four paired sinuses in the head
.
Is sphenoid a flat bone?
This is a
flat bone located in the very back of your skull
. It has an opening that allows your spinal cord to connect to your brain. Sphenoid bone. This is an irregular bone that sits below the frontal bone.
Is there bone between your nose and brain?
The ethmoid bone
, located at the roof of the nose between the eye sockets, separates the nasal cavity from the brain.
What is ethmoid sinusitis?
(ETH-moyd SY-nus)
A type of paranasal sinus
(a hollow space in the bones around the nose). Ethmoid sinuses are found in the spongy ethmoid bone in the upper part of the nose between the eyes. They are lined with cells that make mucus to keep the nose from drying out. Enlarge.
Can you break the ethmoid bone?
The ethmoid
bone can be fractured in cases of facial trauma
– most commonly hitting the dashboard in a collision, or a fall from height. Some signs and symptoms of fracture are related to the anatomy of the ethmoid bone: Fracture of cribriform plate – branches of the olfactory bulb may be sheared.
