INTRODUCTION :
Norma basalis is the basal view of the skull. considering it as one of the most difficult part of studying the skull, the following short notes will help you revise and get through it with ease.
ANATOMICAL DIVISIONS:
For the sake of understanding, Norma basalis is divided into three parts 1.Anterior part of Norma basalis 2. Middle part of Norma basalis 3. posterior part of Norma basalis
ANTERIOR PART OF NORMA BASALIS
The anterior part of Norma basalis extends from the alveolar arch to the posterior border of the hard palate
it is further divided into the alveolar arch and hard palate
![](https://static.wixstatic.com/media/e65409_edca7ed926964feb8e8a9f56a0751f2b~mv2.png/v1/fill/w_980,h_563,al_c,q_90,usm_0.66_1.00_0.01,enc_auto/e65409_edca7ed926964feb8e8a9f56a0751f2b~mv2.png)
Alveolar arch:
provides a socket for tooth
forms the anterior boundary for Norma basalis
Hard palate:
anterior 2/3rd - palatine process of maxilla
posterior 1/3rd -horizontal plates of the palatine
both palatines connected by interpalatine suture
palatine and maxilla connected through the intermaxillary suture
Structures:
greater palatine fossa - transmits descending palatine vessel
incisive fossa- transmits greater and lesser palatine vessels from the oral to nasal cavity and brings the nasopalatine nerve in the opposite direction
lesser palatine fossa - transmits lesser palatine vessels
posterior nasal spine - attachment to musculus uvulae
pyramidal process of maxilla
palatine crest - provides attachment to the palatine aponeurosis
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