skullbonespages1-4.pdf
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Components of Axial Skeleton:
The that contains 22 bones.
The bones associated with the skullincluding the and
.
The vertebral column that consists of 24, 1 and
1 .
The thoracic cage with 24 and one.
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1. Skull
2. ear ossicles, hyoid bone
3. vertebrae, sacrum, coccyx
4. ribs, sternum
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The formsa framework for the organsof the ventral and dorsalbody cavities. The bonesform an extensive surface
area for .Many bones contain
that is
involved in hemopoiesis.
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1. axial skeleton
2. muscle attachment
3. red marrow
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The skull contains 22 bones ofwhich 8 form the thatencloses and protects the brainsuspended in theand 14 thatprotect and support the digestive
and respiratory tracts.
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1. cranium
2. cranial cavity
3. facial bones
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The skull bones, with a fewexceptions, are connected by
immovable jointscalled .
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Sutures
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Some of the major sutures are
- between
the occipital and parietal bones
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-between the parietal bones.
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Sagittal Suture
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-between the frontal and
parietal bones.
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Coronal suture
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-between the parietal and
temporal bones.
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Squamous suture
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- betweenthe frontal and nasal bones
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Frontonasal suture
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Bones of the Cranium
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Thecontributes to the posterior,lateral and inferior surfaces of
the cranium.
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Occipital Bone
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- large circular
opening that connects the craniaand spinal cavities.
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foramen magnum
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- processes
that articulate with the firstcervical vertebra.
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occipital condyles
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- midline bump on the externalsurface.
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- together
with the temporal bone formsthejugular foramen.
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Jugular Notch
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-openings superior to theoccipital condyles through whic
the nerves pass.
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1.hypoglossal canal
2. Hypoglossal
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These bones contribute to thesuperior and lateral surface of
the cranium.
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Parietal Bones
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The have frontaland orbital parts.
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Frontal Bone
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( ) -he part of the frontal bone that
underlies the forehead.
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Frontal (Squamous) Part
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( ) -suture between the frontal
bones that usually disappearsby age 8.
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frontal (metopic) suture
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- edge ofthe frontal part that forms the
superior border of the orbits.
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supraorbital margin
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or -opening or notch in the middle
of the supraorbital margin.
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supraorbital foramen or notch
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-thickened ridges over thesupraorbital margins that
supports the eyebrows.
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superciliary arches
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- the part thaforms the roof of the orbit.
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Orbital Part
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- depressionon the inferior surface of theorbital part that accommodates
the lacrimal gland.
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lacrimal fossa
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Thecontribute to the lateral andinferior walls of the cranium.
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Temporal Bones
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The temporal bone can bedivided into three parts:
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The formsthe lateral surface that borders
the squamous suture.
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Squamous part
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Features of Squamous PartOf the Temporal Bones
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- formshe inferior margin of thesquamous part.
This process with theof the
zygomatic bone forms the
zygomatic arch (cheekbone).
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Zygomatic Process
Temporal Process
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Zygomatic Process of Temporal bone
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- depressionon the inferior base of thezygomatic process that
articulates with the mandible.
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mandibular fossa
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Mandibular Fossa
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- elevationanterior to the mandibular fossa
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articular tubercle
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Articular Tubercle
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Articular Tubercle
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This part is the region thatsurrounds the externalacoustic meatus orexternal
auditory canal. Thispassageway ends as a.
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Tympanic part
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External acoustic meatus aka externalauditory canal