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Skull BY: DR.Yahya Alfarra

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1 Skull BY: DR.Yahya Alfarra

2 Skull Defenition:it is the skeleton of the head
* The skull is composed of several separate bones united at immobile joints called sutures (line of fusion) note?? * Mandible is united to skull by mobile T.M.J Parts of the skull: The skull is divided into 2 parts 1- cranium OR skull cap 2- Facial skeleton.

3 1- The cranium(skull cap):
* The upper& post. Part which encloses the brain. It consists of the following bones: Frontal,parietal(2),occipital,temporal(2),sphenoidðmoid. 2- Facial bones: * it’s the ant. Part of skull which includes: A- upper fixed part. B- lower movable part(mandible) * It consists of the following bones: Zygoamtic bone,maxillae,nasal,lacrimal,vomer,palatine,inf. Conchae,mandible Total : 22 bones




7 1- from sup. Aspect(or norma verticalis)
For convinous of the description,the skull is described from various aspect: 1- from sup. Aspect(or norma verticalis) 2- from ant. Aspect(or norma frontalis) 3- from lat. Aspect(or norma lateralis) 4- from post. Aspect(or norma occipitalis) 5- from inf. Aspect(or norma basalis)

8 1- from sup. Aspect(or norma verticalis)
Now we are going to describe sup. Aspect of skull or norma verticalis: This superior aspect shows : 1- frontal bone- anteriorly 2- occipital bone-posteriorly parietal bone- inbetween(on the side)



11 Coronal suture

12 Lambdoidal suture

13 2- Ant. Aspect of skull (norma frontalis)
The ant. Aspect shows: - forehead - orbital cavity Nasal cavity seperated by nasal septum Upper & lower jaw

14 Anatomical features: A- Forehead
superciliary arches which are more prominent in male than female. nasofrontal suture nasion glabella Note: in some cases the 2 halves of frontal bone persist in adult and called metapoic suture.


16 B- Orbital cavity it’s pyramidal in shape having abase open into face & apex which it opens into cranial cavity. The base of orbit have 4 margins 1- sup. 2- inf. 3-medial 4- lateral

17 sup. Orbital foramen which transmit supraorbital nerves&vesseles.
the supratrochlear notch which transmit supraorbital nerves&vesseles. The inf. Orbital margin , it’s formed by maxilla medially& zygomatic bone laterally infraorbital foramen which transmit infraorbital N.&V. lacrimal fossa Note: the cavity of orbit has a roof , floor ,medial wall & lateral wall. Optic canal

18 Inf. Orbital fissure communicate orbit with both infratemporal fossa & pterygopalatine fossa , it transmits continuation max. N. which is called infratemporal N. & branch of maxillary A. which is called infratemporal A.



21 C- Nasal bone: * 2 nasal bones seperated by nasal septum *This is ant. Nasal spine *This is canine eminence : projection produced by root of canine tooth * Canine fossa : * Incissive fossa :


23 D- Maxilla *It’s enclose with maxillary air sinus to form upper jaw *The process with carry teeth it called alv. Process *The process which formed part of hard palate is called palatine process. Zygoamtic bone: It’s articulate with zygomatic process of temporal bone to form zygomatic arch which lies in lateral aspect of skull.


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