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Axial Skeleton

Axial Skeleton

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Axial Skeleton

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  1. Axial Skeleton • Skull • 8 cranial bones • 14 facial bones • Middle Ear Bones: 6 • Hyoid: 1 • Vertebral Column: 26 • Thoracic Cage: 25

  2. Appendicular Skeleton • Pectoral Girdle: 4 • Upper Limbs: 60 • Pelvic Girdle (coxal bone): 2 • Lower Limbs: 60 • Total: 206

  3. Bones of the Cranium • Occipital • Parietal (2) • Frontal • Temporal (2) • Sphenoid • Ethmoid

  4. Occipital Bone • Forms the wall and base of the posterior portion of the skull

  5. Occipital Bone • Lambdoidal suture: joins to parietal bone • Foramen Magnum: hole for spinal cord, nerves, arteries • Occipital Condyles: bumps that articulate with 1st vertebrae

  6. Parietal Bones • Form sides and roof of cranium

  7. Parietal Bones • Sagittal Suture: joins with other parietal bone • Temporal lines: attachment site for mastication muscles • Coronal suture: joins with frontal bone

  8. Frontal Bone • Forms the anterior portion of the cranium

  9. Frontal Bone • Supraorbital notch: hole for nerves and blood vessels • Frontal Sinuses: enclosed air spaces that lighten bone, lined with mucous membranes

  10. Temporal Bones • Form sides and base of skull • Squamosal Suture: joins parietal bone

  11. Temporal Bones • External acoustic meatus: leads to middle ear • Mastoid process: attachment site for muscles that will move the neck, will conduct vibrations • Styloid Process: attachment site for muscles of tongue and throat

  12. Sphenoid Bone • Directly in middle of skull • Wedged between several other bones

  13. Sphenoid Bone • Sella Turcica: deep saddle-shaped depression that houses the pituitary gland • Sphenoid Sinuses

  14. Ethmoid Bone • Make up nasal cavity and parts of the eye socket • Ethmoid Sinuses

  15. Ethmoid Bone • Crista Galli: meninges that cover brain attach here • Superior and Middle Nasal Conchae: projection of lateral wall of nasal cavity that increase surface area of each cavity