Axial Skelton

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CHAPTER 7 “ The Axial Skeleton” Review your A&P revealed discs Course objectives: Define and identify the bones of the axial skeleton. Axial Skelton. 80 total bones consists of the bones that form the long axis of the body including the: Skull ( total 28 with ear bones ) - PowerPoint PPT Presentation

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  • CHAPTER 7The Axial SkeletonReview your A&P revealed discsCourse objectives:

    Define and identify the bones of the axial skeleton

  • Axial Skelton 80 total bonesconsists of the bones that form the long axis of the body including the:Skull (total 28 with ear bones)Vertebral column [(total 26) C7;T12; L5; S1; Co1]Bony thorax [ribs and sternum (total 25)]Hyoid bone (1)

  • Bones of the axial skeleton

  • Axial Skelton

  • Skull BonesReview A&P revealed discs animation of skullthe skull has two major divisions: Cranium and Facial bonesCranium the 8 bones that enclose the brain. -1 occipital, 1 frontal, 2 parietal, 2 temporal, 1 sphenoid and 1 ethmoid.

    These typical flat bones of the cranium are connected by a special kind of joint called a suture (Synarthroses).

  • Cranial bones

  • Cranial Bones Midsaggital section

  • Cranial Bones Midsaggital section

  • CraniumMade up of 2 major divisions:Calvarium (skull cap)BaseBase contains three large depressions (fossa):Anterior cranial fossa where the frontal lobes sitMiddle cranial fossa where the temporal lobes sitPosterior cranial fossa where the cerebellum sits

  • Cranial Bones

  • Cranial Bones

  • Sutures/Sutural BonesSutures (synarthroses) are immovable fibrous joints. -all bones in the skull, except for the jaw, are united by sutures. The major sutures are:-Coronal-Sagittal-Squamous-LamboidSutural bones- small bones that occur within the sutures, especially the lamboid suture. They are not present in all people.

  • Sutures/Sutural Bones

  • Facial bones

    There are 14 bones that can be thought of as creating the face. As part of this function they provide:- protection for many sense organs, -anchors for many muscles -the openings for air and food to pass.Facial Bones2-maxillae; 2-palatine; 2-nasal; 2- zygomatic; 2-lacrimal; 2-inf nasal conchae; 1- vomer; and 1-mandible

  • Sphenoid boneLooks like a Bat in flight. Greater and lesser wings; optic foramen; sella turcica, superior orbital fissure. Dorsal view.

  • Sphenoid bone

    Dorsal view

    Anterior view

  • Ethmoid boneAnterior to sphenoid boneforms anterior base of skull and nasal cavity.Cribriform plate.Crista galiPerpendicularplate

  • Ethmoid bone

  • Ethmoid bone

  • Foramen/ OrbitsForamen: Special openings in bones where nerves, blood vessels enter into the bone cavity.- Ex.: Foramen magnum, Supraorbital Infraorbital, Mental, Jugular, Olfactory, Mandibular

    Orbits: Cone shaped bony cavities that hold the eyes, fat, occular muscles and tear glands.

  • Bones of the eye orbit

  • Meatus/ SinusesMeatus: a canal or opening into bone- Ex.: external auditory, internal acoustic

    Sinus: cavities within bones filled with air.-Ex.: frontal, ethmoid, sphenoid and maxillary sinuses

  • Cranial sinuses

  • Cranial fossaFossa are depressions or cavities in the skull.

  • The Fetal SkullSutures are called fontanels in fetus.Fontanels-Frontal (anterior)-Occipital (posterior)-Sphenoidal (anterior lateral)-Mastoid (posterior lateral)

  • The Fetal Skull

  • The Fetal Skull