endognathion

en·do·gnath·i·on

(en'dō-gnath'ē-on), In the diphthong gn, the g is silent only at the beginning of a word.
The medial of the two segments constituting the incisive bone. See: mesognathion.
[endo- + G. gnathos, jaw]

endognathion

(ĕn″dō-năth′ē-ŏn) [Gr. endon, within, + gnathos, jaw]
A point in the inner segment of the intermaxillary bone, or premaxilla.