Base of the skull anatomical points, parts

 Base of the skull:

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Define skull:  cranium with mandible is known as skull

Parts of the skull :

Base of the skull and

Cranial vault

Ossification :

base of the skull (intracartilaginous ossification) &

cranial vault : intramembranous ossification

Anatomical points:

1.       infraorbital margin and and upper border of external auditory meatus lies in same horizontal line , this line is known as  Frankfort  line

2.       orbital cavity directed anteriorly

3.       foramen magnum lies horizontally and directed  inferiorly

Show different view of skull :

·         norma verticalis : viewed from above

·         norma frontalis  from front

·         norma basalis from below

·         norma occipitalis from behind

·         norma lateralis from sides

Identification and definition of: bregma, lambda , asterion, pterior  

** pterion: it is the meeting point of 4 bones frontal , squamous part of temporal bone, parietal bone and greater wings of sphenoid clinical important : deep to this point branches of middle meningeal vessels are present . this vessel torn in accident , barr hole operation done here

Cranial fossa : three in number anterior, middle and posterior

Learn Boundary and content of each cranial fossa :