simple summery for Norma Lateralis of skull.

1. Norma Lateralis

2.  Its side view of skull
 It include the following bones:
1-Parietal.
2- Temporal bone (all its parts except petrous).
3- Lateral surface of greater wing
of sphenoid.
4- Zygomatic bone.
5-Nazal bone.
6-Maxillary bone.
7-Parts of frontal and occipital
bones.

3. Thenormalateralisshows the followingfeatures:
A.Two Temporal lines :
 They begin at the zygomatic process of frontal bone arching
upward and backward across the coronal suture and the
parietal bone.
 They end at the posterior end of zygomatic arch to become
continuous with the supramastoid crest.

4. B.Squamouspartoftemporalbone:
 Its articulate with the parietal bone above and with the greater
wing sphenoid bone infront
Squamous part of
temporal bone

5. C.Zygomaticarch:
 The lower border of the zygomatic arch form the articular
tubercle and mandibular fossa.
 While its upper border continuous with supramastoid crest.

6. D.Externalauditorymeatus:
 It lies below the root of the zygomatic arch.
 Its posterosuperior part is formed by the squamous part of
temporal bone.
 Its anteroinferior part Is
formed by the tympanic plate.

7. E.Suprameataltriangle:
 A small triangle depression lies posterosuperior to the
external auditory meatus.

8. F.Mastoidpartoftemporalbone:
 The posterior part of the temporal bone
 The point of meeting of the parietal; occipital and mastoid
bones is called Asterion ; At birth it is the site of the mastoid
(or posterolateral ) fontanelle which ossifies and closes at
the end of the 1st year
 The mastoid process :
 Is a nipple-like downward extension from the mastoid part of
temporal bone

9. Asterion
Mastoid
process

10. G.Thestyloidprocess:
 A slender pointed projection extends from the lower part
of temporal bone.
 Its lies anterior and medial to the mastoid process.
 Is directed downwards ; forwards
and medially.

11. Parietal boneFrontal bone
Nasal bone
Temporal bone
Asterion
Occipital bone
Mastoid process
External auditory matous
Styloid
process
Zygomatic arch
Maxillary bone
Greater wing of
sphenoid
Zygomatic bone