gnathion


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Related to gnathion: pogonion

gnathion

(ˈneɪθɪˌɒn; ˈnæθ-)
n
(Anatomy) the lowest point of the midline of the lower jaw: a reference point in craniometry
[C19: from New Latin, from Greek gnathos jaw]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.gnathion - the most inferior point of the mandible in the midline
craniometric point - a landmark on the skull from which craniometric measurements can be taken
jawbone, jowl, lower jaw, lower jawbone, mandible, mandibula, mandibular bone, submaxilla - the jaw in vertebrates that is hinged to open the mouth
References in periodicals archive ?
b) Lateral cephalometric radiographs skeletal reference points: Nasion (N), sella (S), orbitale (Or), porion (Po), condylon(Co), anterior nasal spine (ANS), posterior nasal spine (PNS), point (A), point (B), gnathion (Gn), menton (Me), and gonion (Go).
The base length of the mandible was measured as the linear distance between the condylion and gnathion (Co-Gn).
For example, computed total face height (trichion to gnathion distance) by the novel image-processing algorithm was converted to actual life size or distance as follows:
Using the sliding caliper, the following parameters were recorded [8]: (1) the upper naso-aural distance (n-obs)--between nasion and otobasion superius; (2) the lower naso-aural distance (n-obi)--between nasion and otobasion inferius; (3) the upper subnasale-aural (sn-obs)--between the subnasale and otobasion superius; (4) the lower subnasale-aural (sn-obi)--between the subnasale and otobasion inferius; (5) the upper gnathion-aural (gn-obs)--between the gnathion and otobasion superius; and (6) the lower gnathion-aural (gn-obi)--between the gnathion and otobasion inferius.
Aging causes progressive loosening of the tissues of the lower face and neck, which manifests as narrowing of the cervicomental angle (between the neck and the lowest point under the chin) and the gnathion angle (between the lowest point trader the chin and the most anterior or prominent point on the front of the chin).
No significant differences in mandibular growth as measured from articulare to gnathion were found between the groups during the first year of treatment.
d) Subnasale to gnathion = lower facial height measured when mandible is at rest position.