The neurocranium develops the cranial cavity that surrounds and protects the brain and brainstem. The neurocranium consists of the occipital bone, 2 temporal bones, two parietal bones, the sphenoid, ethmoid, and also frontal bones—all room joined in addition to sutures.

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Evolutionary,it is the development of the neurocranium the has facilitated the development of the brain and its associated developments.


Neurocranium: A lateral view showing the bones that framework the neurocranium.

Occipital Bone

The occipital bone develops the base of the skull at the rear of the cranium. It articulates through the first vertebra that the spinal cord and additionally contains the foramen magnum, the large opening the the ability through which the spinal cord passes together it start the vertebral column. The occipital bone borders the parietal bones v the heavily serrated lambdoidal suture, and likewise the temporal bones with occipitomastoid suture.

Temporal Bones

The temporal bones are located at the base and also sides the the skull, lateral to the temporal lobes that the brain. The temporal skeleton consist of 4 regions the squamous, mastoid, petrous and tympanic regions.

The squamous region is the largest and most superior region. Worse to the squamous is the mastoid region, and fused in between the squamous and mastoid areas is the petrous region. Finally, the little and worse tympanic region lies anteriorly come the mastoid.

There are two processes that originate indigenous the temporal bone:

The zygomatic procedure that jobs from the reduced squamous an ar and articulates v the zygomatic bone that the cheek. The styloid procedure projects downwards from the interior of the temporal bone and provides attachment for several muscles connected with the tongue.

The temporal bones have four borders:

The occipitomastoid suture off the occipital bone and mastoid part of temporal bone. The squamosal suture the end the parietal bone and squama portion of temporal bone. The sphenosquamosal suture off the sphenoid bone and also squama portion of temporal bone. The zygomaticotemporal suture the end the zygomatic bone and also zygomatic process of temporal bone.

Parietal Bones

The two big parietal bones are connected and also make up component of the roof and also sides the the human skull. The two bones articulate to kind the sagittal suture. In the front, the parietal bones kind the coronal suture v the frontal bone, and also in the rear, the lambdoid suture is by the occipital bone. Finally, the squamosal suture separates the parietal and also temporal bones.

Sphenoid Bone

The sphenoid bone is located in the middle of the skull in the direction of the front and forms the behind of the orbit. It has been described as resembling a butterfly due to its wing-like processes. The sphenoid bone is divided into several parts: the human body of the bone, two better wings, two lesser wings, and the pterygoid processes.

The sphenoid bone is among the most complex in the body due to its interaction with countless facial bones, ligaments, and muscles. The body that creates the middle of the sphenoid bone articulates with the ethmoid and also occipital bone and forms a an essential part that the sleep cavity; it also contains the sphenoidal sinuses.

The higher wings type the floor of the middle cranial fossa that houses the frontal lobes and pituitary gland, and likewise the posterior wall of the orbit. The lesser wings project laterally and kind the floor the the anterior cranial fossa and also the premium orbital fissure v which several crucial optical nerves pass.

Ethmoid Bone

The ethmoid bone is a little bone in the skull the separates the nasal cavity from the brain. It is lightweight as result of its spongy, air-filled construction and also is located at the roof of the nose and also between the two orbits.

The ethmoid bone forms the centregalilee.comial wall surface of the orbit, the roof of the nasal cavity, and also due come its main location that articulates with numerous bones the the viscerocranium. Inside the neurocranium it articulates v the frontal and sphenoid bones.

Frontal Bone

The frontal bone develops the front of the skull and also is separated into 3 parts:

Squamous: This component is big and flat and forms the main an ar of the forehead. Orbital: This component lies inferiorly and forms the exceptional border of the orbit. Nasal: this part is smaller and also articulates with the sleep bones and maxilla to add to the roof that the nose.

The frontal bone boundaries two other neurocranial bones—the parietal bones with the coronal sutures and also the sphenoid bone with the sphenofrontal suture. It likewise articulates with the zygomatic and nasal bones and the maxilla.

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Key Points

The eight bones of the neurocranium form major portions of the skull and protect the brain. The neurocranium consists of two temporal bones situated to the base and side the the skull, and two parietal skeleton that make up the roof the the skull. A solitary occipital bone forms the basic of the skull, and the frontal bone forms the forehead. The sphenoid and also ethmoid bones located to the prior of the skull type parts that the orbit sockets and also nasal cavity; they also support and also protect key organs discovered in the skull.