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Skeletal System part 1
EXTERNAL FEATURES OF THE SKULL
The skull is divided into the neurocranium /calvaria (the top part of the skull)
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The skull is made up of 22 bones
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Bones of the Calvaria
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Frontal
Parietal x2
Sphenoid
Temporal
Occipital
Ethmoid

Sutures of the Calvaria
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Coronal suture- joining the frontal and the parietal bone

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Lambdoid suture –the parietal and the occipital bone

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Sagittal Suture-between the two parietal bones

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Squamous suture –between the parietal bone and the lower part of the temporal bone the par
squamosal

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Sphenoparietal- between the sphenoid bone and the parietal

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Sphenosquamous suture- the greater wing of the sphenoid and the squamous part of the
temporal bone

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Parietomastoid-between the parietal bone and the mastoid process of the temporal bone

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Occipitomastoid suture- between the occipital and the mastoid part of the temporal bone

INTERNAL FEATURES OF THE SKULL
Nasal Septum
Consists of:
 Perpendicular plate
 Vomer
 Palatine
 Septal Cartilage
The lateral nasal walls are made up of 7 bones
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Nasal bone
Ethmoid-makes the superior and the middle conchae bone
Lacrimal bone
Inferior concha
Maxillary
Palatine
Sphenoid

INFERIOR ASPECT OF THE SKULL
Can be divided into three cranial fossae
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The
teeth are located on the alveolar portion of the mandible

TEETH
There are 16 altogether, 4 incisors, 2 canines, 4 premolars and 6 molars the third is the wisdom teeth
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The
joint is a modified hinge joint



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