The metopic suture sometimes exists in the median plane of the frontal bone in 3-8% cases. It’s shaped like the letter lambda, therefore its name. Lambdoid suture, between occipital and 2 parietal bones.It crosses the cranial vault from side-to side. = a crown), between frontal and 2 parietal bones. These bones are connected by the following 3 sutures. Occipital bone (squamous part) posteriorly.Parietal bones (coupled) on every side of midline.Frontal bone (squamous part) anteriorly.The bones are frontal, parietal and occipital. It presents these features: Bones and Sutures When the skull is seen from above, it seems oval, being wider posteriorly than anteriorly. When the skull is seen from superior aspect it’s referred to as norma verticalis when from posterior view, norma occipitalis when from anterior aspect, norma frontalis when from lateral aspect, norma lateralis and when from inferior aspect, norma basalis. The external features of the skull are studied from 5 distinct aspects, viz.
The skull can be studied from outside or from inside (after removing the calvaria or skull cap). The study of skull as a whole is of greater relevance to the majority of health professionals compared to the study of unneeded aspects of the individual bones. Tympanic Cavity (Middle Ear Cavity) and Mastoid ProcessĪ horizontal line created by joining the infraorbital margin and the centre of external auditory meatus is referred to as Reid’s baseline.Differences between Male and Female Skulls.Bony External Nose and Anterior Nasal Aperture.Bulges of the Cheek Created By Zygomatic Bones (Malar Bones).
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