Axial Skeleton Skull.

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Presentation transcript:

Axial Skeleton Skull

Intro: A. 22 Bones all interlock (except jaw) along sutures B. Sutures: immovable joint, such as that between flat bones of skull C. 8 bones form cranium; 13 form facial skeleton; 1_ mandible (lower jaw) held by ligaments

Cranium Function: encloses cavity / protects brain

Includes a) Sinuses (1) Definition: cavity or space w/i a bone or other body part (2) paranasal sinus: (a) Definition: air-filled cavity in cranial bone (b) Structure: lined w/ mucous membrane; connected to nasal cavity (3) Function: (a) decrease weight /increase intensity of voice as resonance chamber (b) membrane lining moistens/cleans air

supraorbital foramen #11 FRONTAL (1) anterior #2 supraorbital foramen #11 lateral #13

Parietal (2) anterior #1 coronal suture #3 lateral #1 coronal suture #12

Occipital (1) lateral #5 lambdoidal suture #3

Temporal (2) anterior #6 lateral #4 squamosal suture #2 mastoid process #8 styloid process #9 zygomatic process #11 ext. auditory meatus #7

Sphenoid (1) anterior #7&13 lateral #14

Ethmoid (1) anterior #5 perpendicular plate #8 lateral #15

Facial Function: form basic shape of face; attachment for muscles moving jaw; expression

Maxilla (2) anterior #17 lateral #19

Palatine (2)

Zygomatic (2) anterior #14 lateral #18 temporal process #6

Lacrimal (2) anterior #4 lateral #16

Nasal (2) Anterior #12 Lateral #17

Mandible (1) anterior # 10 lateral #20

Vomer (1) anterior #9

Inferior Nasal Conchae: shape slows air flow; deflects to olfactory receptors anterior #16

Hyoid (1)

Bones of Ear Malleus (hammer) Incus (anvil) Stapes (stirrup)