What is Exoccipital?
Definition of exoccipital (Entry 1 of 2) : of or relating to a bone or region on each side of the foramen magnum of the skull.
What is the function of foramen magnum?
The foramen magnum functions as a passage of the central nervous system through the skull connecting the brain with the spinal cord. On either side of the foramen magnum is an occipital condyle. These condyles form joints with the first cervical vertebra.
What are the external features of the occipital bone?
The occipital bone is convex externally and concave internally. It is divided into four parts: the basilar part, two lateral parts and squamous part.
Which bone bears the foramen magnum?
The foramen magnum is situated in the occipital bone, and forms around the base of the brainstem (the medulla oblongata), separating the brain above from the spinal cord below.
What is the function of the sphenoid bone?
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.
What is the Basioccipital bone?
Medical Definition of basioccipital (Entry 1 of 2) : relating to or being a bone in the base of the cranium immediately in front of the foramen magnum that is represented in humans by the basilar process of the occipital bone.
What is Forum and Magnum?
The foramen magnum (Latin: great hole) is a large, oval-shaped opening in the occipital bone of the skull. It is one of the several oval or circular openings (foramina) in the base of the skull. The spinal cord, an extension of the medulla oblongata, passes through the foramen magnum as it exits the cranial cavity.
Does food pass through the foramen magnum?
This is false. The foramen magnum is where the spinal cord passes from the brain into the spine. When you eat food it passes between the maxilla and mandible and enters the esophagus in the back of the throat. It never enters the cranial cavity and does not get close to the foramen magnum.
What does the occipital muscle do?
Occipitalis is a relatively thin, rectangular shaped muscle which arises from the occipital bone and inserts in the epicranial aponeurosis. Its primary function is to move the scalp towards the posterior of the skull.
What is the location and function of the occipital condyles?
Here, the occipital condyle is a single rounded projection that is present on the rear of the skull and articulates with the first cervical (neck) vertebra. Functionally it allows the head to move from side to side, up and down, as well as to rotate.
What passes through the jugular foramen?
Cranial nerves IX, X, and XI, originate from the brainstem and exit the cranium via the jugular foramen. These nerves originate from the medulla, the inferior most portion of the brainstem. Cranial nerve IX courses laterally and anteriorly away from the superior medulla and exits the jugular foramen.
What is the largest foramen in the body?
The largest foramen in the human skeleton is the obturator foramen in the pelvic bone. The Obturator Foramen found in the anterior of the Pelvis.
Why is sphenoid bone called the Keystone?
A prominent, irregular, wedge-shaped bone at the base of the skull. The sphenoid bone has been called the “keystone” of the cranial floor since it is in contact with all of the other cranial bones.
What makes the sphenoid bone different?
The sphenoid bone has articulations with twelve other paired and unpaired bones – this makes it the most complex bone in the human body. While the sphenoid bone is unpaired, it stretches from one side of the skull to the other.
How many Foramens are in the skull?
A foramen (plural: foramina ) is an opening inside the body that allows key structures to connect one part of the body to another. The skull bones that contain foramina include the frontal, ethmoid, sphenoid, maxilla, palatine, temporal, and occipital. There are 21 foramina in the human skull.
Where forum and Magnum is found?
What bones protect brain?
Cranium. The eight bones that protect the brain are called the cranium. The front bone forms the forehead. Two parietal bones form the upper sides of the skull, while two temporal bones form the lower sides.
Which bones touch the brain?
Your brain is protected by several bones. There are eight bones that surround your brain: one frontal bone; two parietal bones, two temporal bones, one occipital bone, one sphenoid bone and one ethmoid bone. These eight bones make up the cranium.
Where does the occipital bone run?
Occipital bone location is the back of the head; the Latin term occiput specifically refers to this region. Also known as C0 because it forms one side of the atlanto-occipital joint between the cranium and first cervical vertebra (C1), this bone runs from the base to approximately halfway up the skull.