Wadhwani P, Mathur R M, Kohli M, Sahu R
Saraswati Dental College, Lucknow, Uttar Pradesh, India.
J Oral Pathol Med. 2008 Feb;37(2):122-4. doi: 10.1111/j.1600-0714.2007.00573.x.
The mandibular canal transmits the inferior alveolar artery, vein and the inferior alveolar nerve. From an embryological perspective, there might be three inferior dental nerves innervating three groups of mandibular teeth. During rapid prenatal growth and remodeling in the ramus region there is spread of intramembranous ossification that eventually forms the mandibular canal. Occurrence of bifid/trifid mandibular canals in some patients is secondary to incomplete fusion of these three nerves. Various types of bifid mandibular canals have been classified according to anatomical location and configuration. This case report highlights an unusual variant of the mandibular canal.
下颌管内走行下牙槽动脉、静脉及下牙槽神经。从胚胎学角度来看，可能存在三条下牙神经支配三组下颌牙。在出生前下颌升支区域快速生长和重塑过程中，膜内成骨扩展，最终形成下颌管。部分患者出现双叉/三叉下颌管是这三条神经不完全融合所致。已根据解剖位置和形态对各种类型的双叉下颌管进行了分类。本病例报告突出了一种不寻常的下颌管变异情况。
