现代人类的变化 树叶落叶的磨毛乳形成时间 时间
Patrick Mahoney1, Gina McFarlane2, Petrina Barnard1
1The Histology Lab, School of Natural Sciences, University of Kent, Canterbury, UK.
American journal of biological anthropology
|November 14, 2025
概括
现代人类的树叶垂牙形成时间显示了较小的地理差异,但考古样本比当今的人口早几个月完成了牙形成. 这表明,早期增长率的变化影响了发展.
科学领域:
- 古人类学古人类学.
- 人类生物学 人类生物学
- 发展生物学 发展生物学
背景情况:
- 树叶毛面膜形成时间为青少年化石人类发展提供了洞察力.
- 了解现代人类质形成的变化对于比较研究至关重要.
研究的目的:
- 研究现代人类产前和产后质尖端形成时间的地理和时间变化.
- 分析面膜形成速度和数量,以了解时间差异.
主要方法:
- 从八个现代和考古学种群中分析了356个叶落的第一个和第二个牙的组织学分析.
- 形成时间是使用镜长度和每日交叉条纹计算的.
主要成果:
- 当今的人口显示了相似的总尖端形成时间,太平洋岛民的形成速度更快.
- 考古样本比现在的群体早2.53个月完成了质尖端的形成.
- 较慢的生长速度和延长的产后形成期有助于形成时间的延长.
结论:
- 在当今的人口中,质形成时间存在很少的显著差异.
- 在考古样本中,较早的质完成可能反映了体质生长速度的变化.
相关概念视频
01:15Teeth
1.6K
The formation of teeth, also known as odontogenesis, is a complex process that begins in utero, around the sixth week of embryonic development. There are three stages to this process: the bud stage, the cap stage, and the bell stage.
In the bud stage, the tooth germ (an aggregation of cells) starts to form in the developing jawbone. During the cap stage, the tooth germ differentiates into enamel organ, dental papilla, and dental sac, which will later develop into the tooth's enamel, dentin...
In the bud stage, the tooth germ (an aggregation of cells) starts to form in the developing jawbone. During the cap stage, the tooth germ differentiates into enamel organ, dental papilla, and dental sac, which will later develop into the tooth's enamel, dentin...
1.6K
01:21Tooth Anatomy
2.0K
The human tooth enables us to eat a variety of foods, speak clearly, and even aid in shaping our faces. Teeth are composed of various elements that work together. Here's a detailed look at the anatomy of a human tooth.
The Crown, Neck, and Root
The visible part of the tooth is referred to as the crown. It's covered by enamel, the hardest substance in the human body. The crown is uniquely shaped for each type of tooth, allowing for different functions such as cutting, tearing, or...
The Crown, Neck, and Root
The visible part of the tooth is referred to as the crown. It's covered by enamel, the hardest substance in the human body. The crown is uniquely shaped for each type of tooth, allowing for different functions such as cutting, tearing, or...
2.0K