Skeletal System:- Neurocranium - Parietal bone

The parietal bone (latin: os parietale) is located on each side of the skull right behind the frontal bone.

Both parietal bones together form most of the cranial roof and sides of the skull.

1. Parietal
Bone
Skeletal System
Neurocranium
Dr. Aves Khan
Oral & Dental
Surgeon

2. Introduction of
Parietal Bone
Theparietal bone(latin:os parietale) is located on each side of the skull
right behind the frontal bone.
Bothparietal bonestogether form most of the cranial roof and sides of
the skull.
Eachparietal bonetakes an irregular quadrilateral shape and has four
angles, four margins, and two surfaces.

3. Angles of
Parietal Bone
Thefouranglesoftheparietalboneare:
Frontalangle:itsanteriorsuperiorangle
Sphenoidalangle:Itistheanteriorinferiorangle,andthemost
sharpestangleoftheparietalbone.
Occipitalangle:itsposteriorsuperiorangle.
Mastoidangle:Itistheposteriorinferiorangleoftheparietal
bone.

4. Margins of
Parietal Bone
The four margins or borders of theparietal boneare the following:
Frontal margin: It forms its anterior border.
Occipital margin: It forms the posterior border of theparietal
bone.
Squamous margin: It is the inferior margin of theparietal bone.
Sagittal margin: It is its upper, medial margin.

5. Surfaces and
landmarks of
parietal bone
Theparietal bonehas an external and an internal surface.
Theexternal surface of theparietal bonefeatures the following
landmarks:
parietal tuber,
superior temporal line,
inferior temporal line,
parietal foramen.
Theinternal surfaceof theparietal bonefeatures:
Groove for superior sagittal sinus
Granular foveolae
Groove for sigmoid sinus
Impressions of cerebral gyri
Arterial grooves

6. Theexternal
surface of the
parietal bone
Theparietaltuber(orparietaleminence)isaprominencelocated
nearthemiddleoftheexternalsurfaceoftheparietalbone.
Thesuperiortemporallineisacurvedlineseenontheexternal
surfaceoftheparietalboneforattachmentofthetemporal
fascia.Thesuperiortemporallinealsorepresentstheupper
marginofthetemporalplane.
Theinferiortemporallineisacurvedlineontheexternalsurface
oftheparietalboneforattachmentofthetemporalismuscle.
Theparietalforamenisanopeningoccasionallypresentatthe
backpartoftheparietalbone,thatservesasapassageforthe
parietalemissaryvein,whichdrainsintothesuperiorsagittal
sinus.

7. Anatomical
views of the
Parietal bone

8. Dr. Aves Khan
Oral & Dental
Surgeon