Bones
Bones
Bones Easy
Sutures
General
100

These form most of the upper lateral side of the skull. These are paired bones, with the right and left bones joining together at the top of the skull. 

Parietal Bone

100

This bone forms the lower lateral side of the skull. It is subdivided into several regions including Mandibular fossa, Styloid process, mastoid process, petrous ridge, etc. 

Temporal Bone

100

This is the single bone that forms the forehead.

Frontal Bone

100

This suture runs horizontally across the top of the skull, from ear to ear and joins the frontal bone to the 2 parietial bones.

Coronal Suture

100

The Skull is part of which Skeletal System?

Axial

200

This is one of a pair that together form the upper jaw, much of the hard palate, the medial floor of the orbit, and the lateral base of the nose.

Maxillary bone or the Maxilla

200

The 2 small bones in the eye socket

Lacrimal bones

200

Also known as the Jaw Bone

Mandible

200

Between the parietal bones and the occipital bone. This suture runs across the back of the skull and forms a triangle with the sagittal suture.

Lambdoid

200

This is the large opening on the lateral side of the skull that is associated with the ear.

External acoustic meatus

300

This is a single, midline bone that forms the roof and lateral walls of the upper nasal cavity, the upper portion of the nasal septum, and contributes to the medial wall of the orbit. On the interior of the skull, it also forms a portion of the floor of the anterior cranial cavity.

Ethmoid Bone

300

These form a curved bony plate that projects into the nasal cavity space from the lower lateral wall.

Inferior Nasal Conchae

300

These 2 Bones form the "Bridge" of the nose

Nasal Bones

300

Between the parietal bone and the temporal bone on each side of the skull. This suture is on the side of the skull and is curved.

Squamous Suture

300

This is located at the base of the skull, in the occipital bone and is the foramen in which the spinal cord passes through as it connects to the brainstem.

Foramen Magnum

400

This is a single, complex bone of the central skull. It forms much of the base of the central skull and also extends laterally to contribute to the sides of the skull. It serves as a “keystone” bone, because it joins with almost every other bone of the skull.

Sphenoid Bone

400

This bone is triangular-shaped and forms the posterior-inferior part of the nasal septum.

Vomer 

400

This is the single bone that forms the posterior skull and posterior base of the cranial cavity.

Occipital Bone 

400

This is a small, capital-H-shaped suture line region that unites the frontal bone, parietal bone, squamous portion of the temporal bone, and greater wing of the sphenoid bone. It is the weakest part of the skull.

Pterion

400

Inside the Skull, this base forms the floor of the cranial cavity and is subdivided into three large spaces that increase in depth.

anterior cranial fossa, middle cranial fossa, and posterior cranial fossa 

500

This is one of a pair of irregularly shaped bones that contribute small areas to the lateral walls of the nasal cavity and the medial wall of each orbit.

Palatine Bone

500

This is located at the midline of the middle cranial fossa.  This bony region of the sphenoid bone is named for its resemblance to the horse saddles used by the Ottoman Turks, with a high back and a tall front.

Sella Turcica (“Turkish saddle”)

500

This pair of bones are also known as the Cheekbones

Zygomatic 

500

Between the two halves of the frontal bone. This suture usually fuses in early childhood, but in some individuals, it remains visible into adulthood.

Metopic

500

This is also called “rooster’s comb or crest” and is a small upward bony projection located at the midline. It functions as an anterior attachment point for one of the covering layers of the brain.

Crista Galli

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