Temporal bones


There are two temporal bones, each which is constructed of four bone plates, which create the lower sides of the cranium structure. Each temporal bone is held adjacent to the appropriate parietal bone with the squamous suture.


The flattened plate of bone that forms the side of the skull is referred to as the squamous part. The squamous part helps to form the madibular fossa from the formation created on the interior portion which is met by the condyle of the mandible, forming the joint.

This creation is referred to as the temporomandibular joint. The posterior section of the zygomatic arch is formed through the zygomatic archway. This occurs just forward of the squamous part.

The ear canal is located in the tympanic part of the temporal bone. Also known as the external acoustic meatus, it is situated behind the madibular fossa. Just inferior of the tympanic part, the thin and pointy styloid process protrudes.


Temporal bones
Image: Temporal Bones

Just behind the ear canal a rounded projection known as the mastoid part. The mastoid process is directly anterior to the mastoid foramen. The stylomastaloid foramen fits snugly between the mastoid and the styloid process and creates the perfect crevice for facial nerves to pass through.


The floor of the cranium reveals the petrous part, which is part of the temporal bone and plays host to the middle and inner ear. Bordering alongside the petrous, the jugular foramen and the carotid canal create their contribution to the cranial composition. The carotid canal is responsible for allowing blood flow to the brain while the jugular foramen allows the blood to flow away from the brain. Both of these processes are organized to allow an internal vein through their structure for their intended purposes. The jugular foramen also permits the passage of three vital cranial nerves.
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