The skull
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Transcript of The skull
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The skull The skull is
composed of two parts:
1. Cranium
2. Facial skeleton
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Frontal
Parietal
Occipital
Coronal suture
Sagittal suture
Lambdoid suture
Parietal foramen
Anterior
Posterior
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Norma verticalis (superior view)
Bone forming:- Frontal bone- Parietal bone- Squamous part
of occipital bone
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Norma verticalis (cont.) Sutures seen:- Coronal suture, - Sagittal suture, - Lambdoid suture,
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Bregma
Lambda
Ant.fontanell
Post.fontanell
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Norma occipitalis (posterior view)
There are the following bones:- Squamous part of occipital bone.- Parietal bones, separated from the occipital by the lambdoid suture.- Mastoid part of temporal bone, on each side of the squamous part of occipital, separated by the occipitomastoid suture.
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Parietal
Occipital
Mastoid
Ext.occipital protuberence
Ext.occipital crest
Sup.&inf.nuchal lines
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Norma occipitalis
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FrontalMaxilla
Zygomatic bone
Nasal
Supra-orbital foramen
Infra-orbital foramen
Ant.nasal spine
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Norma frontalis (cont.)
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OrbitIt is a pyramidal shaped space with its apex directed backwards.Its base is directed forwards at the orbital openings.Its long axis is directed forwards and laterally.It has a roof, a floor, a medial wall and a lateral wall.- Lacrimal fossa: It is a depression in the anterior and lateral part of the roof.- Optic canal: It is a foramen in posterior part of the roof.