80of:
total bones
Functions:
1. Skull and facial bones (29)
 Protects Vital Organs
2. Thoracic Cage: sternum and ribs (25)
 Provides areas for muscle
3. Vertebral Column (26)
attachment
Composed of:
1. Skull and facial bones (29)
2. Thoracic Cage: sternum and ribs
(25)
3. Vertebral Column (26)
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Cranium = houses brain
Facial bones =
protect/support digestive
and respiratory entrances
Foramen = holes for
nerves and blood vessels
Two foramen you need to
know: mental foramen
and foramen magnum
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Frontal
Parietal
Occipital
Temporal
Sphenoid
Maxilla
Mandible –
only
moveable
bone of the
skull
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Need to know:
Nasal, vomer,
ethmoid, maxilla,
mandible,
zygomatic,
lacrimal,orbit ,
sphenoid
Difficult bone to see, greater wing of sphenoid makes up side of skull, front
part of bone makes up the orbitals
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In addition to skull bones, you will also be required to
recognize some special markings of the skull bones
Foramen - holes for nerves and blood vessels (mental
foramen and foramen magnum)
Process – a projection or outgrowth of tissue from the
body (styloid process, mastoid process, zygomatic
process/arch)
Meatus – a natural body opening or canal (external
auditory meatus)
Condyle – The rounded projection on the articulated
(where joints occur) end of a bone (occipital condyle)
Ramus – any part that branches from another part
(ramus of the mandible)
Notch - an indentation on the edge of a bone
(Mandibular notch)
Palatine Bone
Occipital condyles
Foramen Magnum
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Sutures are interconnections
between bones
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Lambdoidal = parietal +
occipital
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Sagittal = 2 parietal bones
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Frontal = frontal + parietal
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Squamous = Temporal +
Parietal
Sagittal
Sagittal
Lambdoidal
Squamous
Frontal
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Fontanels are spaces between the bones of the skull in
an infant or fetus, where ossification is not complete
and the sutures not fully formed (“soft spots” of
infant’s skull). Sutures will not completely fuse until
about 30 years old.
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The sinus is an moist, air-filled chamber. It
produces mucus to filter air and make the bones
lighter. It also plays a role in how our voices
sound.