What separates the anterior cranial fossa?

The lesser wings of the sphenoid separate the anterior and middle fossae.

What are the borders of the middle cranial fossa?

The middle cranial fossa is bounded anteriorly by the sphenoid ridge, medially by the lateral wall of the cavernous sinus and Meckel’s cave, posteriorly by the sphenoid wing and petrous bone, and laterally by the greater wing of sphenoid and squamous temporal bone.

What are the boundaries of cranial cavity?

The occipital bone is the caudal boundary of the cranial cavity, leaving an opening, the foramen magnum, for the exiting spinal cord. Rostrally, the ethmoid bone separates the cranial from the nasal cavity.

What are the boundaries of the temporal fossa?

The temporal fossa has the following borders:

• Superiorly and posteriorly – superior temporal line.
• Inferiorly – zygomatic arch.
• Anteriorly – frontal process of the zygoma and zygomatic process of the frontal bone.

Which two bones form the anterior and posterior boundaries of anterior cranial fossa?

The anterior cranial fossa consists of three bones: the frontal bone, ethmoid bone and sphenoid bone. It is bounded as follows: Anteriorly and laterally it is bounded by the inner surface of the frontal bone.

What forms the anterior cranial fossa?

The anterior cranial fossa is formed by the orbital part of the frontal bone, the cribriform plate and crista galli of the ethmoid bone, and the lesser wings and anterior part of the body (jugum sphenoidale and prechiasmatic sulcus) of the sphenoid bone (Standing, 2015).

What are the four regions of the temporal bone?

The temporal bones comprise four regions:

• the squamous region, which is the largest.
• the mastoid region.
• the petrous region.
• the tympanic region.

Which bones are divided by the sagittal suture?

Sagittal suture, runs longitudinally across the skull from the occipital to the frontal bone and separates the parietal bones from one another.

What is anterior to mandibular fossa?

In the temporal bone, the mandibular fossa is bounded anteriorly by the articular tubercle and posteriorly by the tympanic portion of the temporal bone, which separates it from the external acoustic meatus.