What exactly causes a short ramus

[zeph.u]

Is it not enough to teeth stimulus to let the brain to trigger jaw development?

 

[negativ_canthalshit]

The influence of the dentition on the shape of the mandible - PubMed

In the course of life the mandible undergoes substantial morphological and dimensional changes. The changes concerning mandibular angle, relation between the length of the mandibular corpus and ramus as well as roughness in the place of insertion of masseteric and pterygoid muscles do not depend...

pubmed.ncbi.nlm.nih.gov

Dimensional variation of craniofacial structures in relation to changing masticatory-functional demands - PubMed

A reduction in masticatory stress has been an important factor in the evolution of the human skull. Similarly, the recent increase in the occlusal variation has been related to a change in masticatory activity. The present study investigates short-term variation in craniofacial dimensions by...

pubmed.ncbi.nlm.nih.gov