Chapters 6 - Dr. Gerry Cronin

Chapters 6 - Dr. Gerry Cronin

Bone Markings Bone Markings Bones of the Axial Skeleton There are 80 bones in the central (axial) skeleton, comprising: Skull Vertebral column (including the sacrum) Ribs

Sternum Bones of the Skull The skull protects and supports the brain and special sense organs. Besides forming the large cranial cavity, the skull also forms several smaller cavities.

Nasal cavity Orbits (eye sockets) Paranasal sinuses Small cavities which house organs involved in hearing and equilibrium Bones of the Skull The bones of the skull are grouped into two categories: Cranial bones Facial bones Cranial

bones Facial bone s Bones of the Skull 8 Cranial Bones (Bones of the Braincase) 14 Facial Bones Mandible (1) Frontal bone (1)

Maxilla (2) Parietal bone (2) Zygomatic bone (2) Temporal bone (2) Nasal bones (2) Occipital bone (1)

Lacrimal bones (2) Sphenoid bone (1) Palatine bones (2) Ethmoid bone (1) Inf. Nasal conchae (2) Vomer (1) Bones of the Skull

The braincase (neurocranium) has 8 bones: Single frontal, occipital (not shown on this graphic), ethmoid, and sphenoid bones, and paired temporal and parietal bones. Bones of the Skull Parietal bone

Frontal bone Sphenoid bone Temporal bone Ethmoid bone Occipital bone

Bones of the Skull A suture is a seam an immovable joint between bones of the skull. Coronal Suture Squamous Suture Lambdoidal Suture Bones of the Skull

Fontanels (little fountains) are soft, mesenchyme-filled spaces between cranial bones in babies. They will become suture joints in adults. Bones of the Skull The paranasal sinuses are prominent features of the frontal bone, ethmoid bone, sphenoid bone, and maxillary bones. Greater and lesser wings of the

Sphenoid bone Sphenoid sinus Ethmoid bone (top) showing the air cells that make up the Ethmoid sinuses. Sphenoid bone (right) Bones of the Skull With the exception of the ethmoid sinuses, the

other paranasal sinuses are paired. They are lined with mucus membranes that humidify and warm the air. Reduce weight in the skull Help to resonate the sound of our voice Bones of the

Skull Of the 8 cranial bones that fit together to form the braincase, the sphenoid bone is the keystone. Like the keystone of a roman arch, the sphenoid is the center brick that balances the outward thrust of the other bones. Representatio n of a Roman Arch

Bones of the Skull The Sphenoid bone The rest of the braincase bones are dependent for support on the sphenoid bone (with its greater and lesser wings).

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