The human mandibular canal arises from three separate canals innervating different tooth groups
The human mandibular canal arises from three separate canals innervating different tooth groups
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DOI：
10.1177/00220345960750080401
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发表时间：
1996-08-01
影响因子：
7.6
通讯作者：
Kjaer, I
中科院分区：
文献类型：
--
作者：
ChavezLomeli, ME;Lory, JM;Kjaer, I
本研究的目的是描述人下颌管的产前形成。由于骨管在出生前发育于神经通路周围，因此认为骨管模式可以反映牙列的神经支配模式。这种早期运河模式的映射似乎并没有进行过。材料包括来自墨西哥城国家人类学和历史研究所的人类学下颌骨。共302人半下颌骨从后半期的产前期间进行了调查。长度，测量从颏联合到下颌髁状突，从28到60毫米不等。牙槽骨成熟分为两个阶段，根据乳牙和第一恒磨牙的牙槽窝的外观。将牙胶尖插入下颌支舌侧表面的根管开口（孔），对下颌骨进行X线摄影。研究表明，根管最早出现在切牙，其次是根管到乳磨牙，最后是一个或多个根管到第一恒磨牙。在最成熟的组，三个不同的根管总是出现在每个半下颌骨。根管从下颌升支舌面向不同牙组延伸。下牙槽神经可能在下颌骨中作为三个独立的神经路径起源于不同的发育阶段。这表明，快速产前生长和重建的分支区域的结果在一个逐渐合并的运河入口，这是明显的出生。据推测，在这三组牙齿的牙齿发育不全的模式是有关的三个独立的神经支配的牙列路径。
The purpose of this study was to describe the prenatal formation of the human mandibular canal. Since bony canals develop in prenatal life around the nerve paths, it was assumed that the canal pattern could reflect the pattern of innervation of the dentition. Mapping of this early canal pattern does not appear to have been undertaken before. The material consisted of anthropological mandibles from the National Institute of Anthropology and History, Mexico City. A total of 302 human hemimandibles from the latter half of the prenatal period was investigated. The length, measured from the mental symphysis to the mandibular condyle, ranged from 28 to 60 mm. The dento-alveolar maturity was classified in two stages according to the appearance of alveolar sockets of deciduous and first permanent molars. The mandibles were radiographed with guttapercha points inserted into the canal openings (foramina) on the lingual surfaces of the mandibular rami. The study showed that the canal to the incisors appeared first, followed by the canal to the primary molars, and last by the one or more canals to the first permanent molars. In the most mature group, three different canals always occurred in each hemimandible. The canals were directed from the lingual surface of the mandibular ramus toward the different tooth groups. The inferior alveolar nerve presumably occurs in the mandible as three individual nerve paths originating at different stages of development. It is suggested that rapid prenatal growth and remodeling in the ramus region result in a gradual coalescence of the canal entrances that is obvious at birth. It is hypothesized that the pattern of tooth agenesis within the three groups of teeth is related to the three separate paths of innervation of the dentition.