A morphological study of the protuberance on the lateral surface of the mandible in primates

2014 Fiscal Year Final Research Report

• Project/Area Number: 23570284
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Physical anthropology
• Research Institution: Nihon University (2012-2014); Aichi Gakuin University (2011)
• Principal Investigator: KONDO Shintaro 日本大学, 松戸歯学部, 教授 (60186848)
• Co-Investigator(Kenkyū-buntansha): NAITOH Munetaka 愛知学院大学, 歯学部, 准教授 (20167539) ; MATSUNO Masanobu 日本大学, 松戸歯学部, 講師 (10297848)
• Co-Investigator(Renkei-kenkyūsha): TAKAI Msanaru 京都大学, 霊長類研究所, 教授 (90252535) ; IGARASHI Yuriko 日本大学, 松戸歯学部, 講師 (60277473)
• Project Period (FY): 2011-04-28 – 2015-03-31
• Keywords: 下顎骨の外側面 / 非ヒト霊長類 / コンピュータ断層撮影法 / 下顎隆起 / 下顎窩 / 緻密骨 / 頬袋 / 下顎骨の力線

Outline of Final Research Achievements

In order to clarify the morphological characteristics and function of the protuberance and/or fossa on the lateral surface of the mandible, we examined 778 mandibles of non-human primates. Both protuberance and fossa were found in Macaca, Chlorocebus, and Cercocebus. The protuberance was composed of compact bone, and was similar to the mandibular torus in humans. A well-developed protuberance was cloth to the orifice of buccal pouch. A deep and large fossa was found in all individuals of Papio, Theropithecus, and Mandrillus, and the bone width was thin in the center of the fossa. The fossa extended from the third premolar to second molar region, and the deepest area was the first molar region. These concavo-convex structures have some biological functions and represent an adaptive change for mastication.

Free Research Field

生物学