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The Skull. Two parts of the skull: –The cranium encloses and protects the brain –The facial bones hold the eyes and face shape.

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Presentation on theme: "The Skull. Two parts of the skull: –The cranium encloses and protects the brain –The facial bones hold the eyes and face shape."— Presentation transcript:

1 The Skull

2 Two parts of the skull: –The cranium encloses and protects the brain –The facial bones hold the eyes and face shape

3 Eight large flat bones fused together (sutures): –Frontal – forms forehead –Parietal – superior and lateral walls (paired) –Temporal – inferior to parietal, at temples (paired) –Occipital – posterior wall –Sphenoid – deep to the anterior of skull, forms floor of cranial cavity –Ethmoid – forms roof of nasal cavity, medial walls of orbits

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10 Thirteen bones fused together, with one connected by joints –Maxillae – forms upper jaw (paired) –Palatine – posterior to maxillae, between back molars (paired) –Zygomatic – cheekbones, lateral walls of orbits (paired) –Lacrimal – part of medial walls of orbits, between ethmoid bones and maxillae (paired)

11 Continued… –Nasal – bridge of nose (paired) –Vomer – median line of nasal cavity –Inferior conchae – bone projections from lateral wall of nasal cavity (paired) –Mandible – lower jaw, connected by only freely movable joint of face

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20 Hyoid Bone –Not technically part of skull –Does not articulate directly with any other bone –Anchored to temporal bones by ligaments –Movable base for tongue –Attachment point for neck muscles

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22 Bone Markings –Meatus – canal-like passageway External Auditory Meatus – canal leads to eardrum and middle ear (temporal) –Process – bony prominence Styloid Process – inferior to auditory meatus (temporal) Zygomatic Process – anterior to cheek bone (temporal) Mastoid Process – posterior and inferior to auditory meatus (temporal) Palatine Processes – extensions of maxillae that form the anterior part of the mouth (maxillae)

23 –Foramen – opening through bone Jugular Magnum – at junction of occipital & temporal bones, opening for jugular vein (temporal) Carotid Canal – anterior to jugular foramen, opening for carotid artery (temporal) Foramen Magnum – opening for spinal cord to connect to brain (occipital) Foramen Ovale – opening for nerve fibers to pass to jaw muscles (sphenoid) –Condyle – rounded articular projections (involved with joints) Occipital Condyles – rest on the first vertebra of the spinal column (occipital) –Sinuses – cavities in bone filled with air Paranasal Sinuses – found in different bones surrounding nasal cavity (frontal, ethmoid, sphenoid, maxillae)

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