the skull

The skull The skull is

composed of two parts:

1. Cranium

2. Facial skeleton

Frontal

Parietal

Occipital

Coronal suture

Sagittal suture

Lambdoid suture

Parietal foramen

Anterior

Posterior

Norma verticalis (superior view)

Bone forming:- Frontal bone- Parietal bone- Squamous part

of occipital bone

Norma verticalis (cont.) Sutures seen:- Coronal suture, - Sagittal suture, - Lambdoid suture,

Bregma

Lambda

Ant.fontanell

Post.fontanell

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.

Parietal

Occipital

Mastoid

Ext.occipital protuberence

Ext.occipital crest

Sup.&inf.nuchal lines

Norma occipitalis

FrontalMaxilla

Zygomatic bone

Nasal

Supra-orbital foramen

Infra-orbital foramen

Ant.nasal spine

Norma frontalis (cont.)

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.