Lecture 6 4 skeletal system
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Lecture 6.4: Skeletal System. The Skull. AKA: The Cranium Protects our brain Gives us our senses. Frontal Bone. Forehead Orbits—spaces for eyes Frontal sinuses—air-filled chambers Lighten bone Produce mucus for nasal cavity. Figure 6.10. Parietal Bone (Paired).

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The skull
The Skull

  • AKA: The Cranium

  • Protects our brain

  • Gives us our senses


Frontal bone
Frontal Bone

  • Forehead

  • Orbits—spaces for eyes

  • Frontal sinuses—air-filled chambers

  • Lighten bone

  • Produce mucus for nasal cavity



Parietal bone paired
Parietal Bone (Paired)

  • Posterior to frontal bone

  • Sagittal suture—locks 2 bones together

  • Coronal suture--locks parietal to frontal



Occipital bone
Occipital Bone

  • Most posterior

  • Lambdoid Suture—locks occipital with parietal

  • Foramen magnum—where spinal cord passes



Temporal bone paired
Temporal Bone (Paired)

  • Below parietal

  • Squamous suture—connects parietal to temporal



Sphenoid bone
Sphenoid Bone

  • Part of floor of cranium

  • Unites cranium and facial bones

  • Sellaturcica—depression that houses pituitary gland



Ethmoid bone
Ethmoid Bone

  • Anterior to sphenoid

  • Medial eyes and roof and sides of nasal cavity

  • Nasal septum—divides nose into left/right sides



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