Skeleton Divided into sections Axial Appendicular Made of 206 bones

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Transcript of Skeleton Divided into sections Axial Appendicular Made of 206 bones

  • SkeletonDivided into sectionsAxialAppendicularMade of 206 bones

  • Provides a framework that supports and protects organs in the dorsal and ventral body cavitiesJoints are rigid and have limited movement but are very strongMade of 80 bones

  • Skull and Associated Bones

    Occipital bone (1)Parietal Bones (2)Frontal BoneTemporal Bone (2)Sphenoid BoneEthmoid bone

  • Skull and Associated BonesProtect and guards entrance to the digestive and respiratory tractCranial bones- enclose the cranial cavity, a fluid filled chamber that cushions and supports the brainInner surface has blood vessels, nerves, and membranes that stabilize the brainOuter surface provides area for attachment of muscle that move eyes, jaws, and head

  • Sutures of the skullConnections between the skull bones are immovable joints called sutures (connection of mandible is an exception)

  • Skull SuturesLamboidal suture- arches across the posterior surface of the skull. Separates the occipital bone from the parietal bones.Coronal Suture- arches across the top of the skull. Separates the frontal bone from the parietal bones.

  • Sutures cont.Sagittal Suture- goes between the lamboidal and coronal sutures splitting the 2 parietal bonesSquamous Sutures (2) - one on each side of the head between the parietal and temporal bones

  • Facial Bones (14)Maxillary bonesPalatine bonesNasal bonesVomer (1)

    Inferior nasal conchaeZygomatic bonesLacrimal bonesMandible (1)

  • Infant SkullBone growth is attempting to keep up with brain development, so at birth bones havent fused together yetAt approx. age 5 brain stops growing so does the skull, and the cranial sutures develop

  • FontanelsFontanel- large fibrous areas between skull bonesAnterior, Occipital, Sphenoidal, and Mastoid FontanelsOccipital, sphenoidal, and mastoid fontanels disappear 1-2 months after birth, and the anterior fontanel persists until age 2