Jove
Visualize
联系我们
JoVE
x logofacebook logolinkedin logoyoutube logo
关于 JoVE
概览领导团队博客JoVE 帮助中心
作者
出版流程编辑委员会范围与政策同行评审常见问题投稿
图书馆员
用户评价订阅访问资源图书馆顾问委员会常见问题
研究
JoVE JournalMethods CollectionsJoVE Encyclopedia of Experiments存档
教育
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab Manual教师资源中心教师网站
使用条款与条件
隐私政策
政策

相关概念视频

The Fossil Record02:56

The Fossil Record

The fossil record documents only a small fraction of all organisms that have ever inhabited Earth. Fossilization is a rare process, and most organisms never become fossils. Moreover, the fossil record only exhibits fossils that have been discovered. Nevertheless, sedimentary rock fossils of long-lived, abundant, hard-bodied organisms dominate the fossil record. These fossils offer valuable information, such as an organism's physical form, behavior, and age. Studying the fossil record helps...
Convergent Evolution01:54

Convergent Evolution

Evolution shapes the features of organisms over time, ensuring that they are suited for the environments in which they live. Sometimes, selection pressure leads to the rise of similar but unrelated adaptations in organisms with no recent common ancestors, a process known as convergent evolution.The structures that arise from convergent evolution are called analogous structures. They are similar in function even if they are dissimilar in structure. Further, structures can be analogous while also...
Cranial Bones: Lateral View01:27

Cranial Bones: Lateral View

The lateral view of the cranium is dominated by temporal, sphenoid, and ethmoid bones.
The temporal bone forms the lower lateral side of the skull. The temporal bone is subdivided into several regions. The flattened upper portion is the squamous portion of the temporal bone. Below this area and projecting anteriorly is the zygomatic process of the temporal bone, which forms the posterior portion of the zygomatic arch. Posteriorly is the mastoid portion of the temporal bone. Projecting...
The Hyoid Bone01:12

The Hyoid Bone

The hyoid bone is a small U-shaped bone located in the upper neck at the level of the inferior mandible, with its tips pointing posteriorly. It does not directly articulate with any other bone in the body. The hyoid acts as the attachment site for the tongue, the larynx, and the pharynx. It is held in position by a series of small muscles attached from above or below. These muscles help to move the hyoid up/down or forward/back in coordination with movements of the tongue, larynx, and pharynx...
Teeth01:15

Teeth

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 and...
Tooth Anatomy01:21

Tooth Anatomy

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 grinding food.

您也可能阅读

相关文章

通过共同作者、期刊和引用图与本文相关的文章。

排序
Same author

A comprehensive diagnostic approach combining phylogenetic disease bracketing and CT imaging reveals osteomyelitis in a Tyrannosaurus rex.

Scientific reports·2020
Same author

A systematic review of viral transmission risk to healthcare staff comparing laparoscopic and open surgery.

The surgeon : journal of the Royal Colleges of Surgeons of Edinburgh and Ireland·2020
Same author

Birdlike growth and mixed-age flocks in avimimids (Theropoda, Oviraptorosauria).

Scientific reports·2019
Same author

Meta-analysis of patient-reported outcomes after laparoscopic versus open inguinal hernia repair.

The British journal of surgery·2019
Same author

A dinosaur community composition dataset for the Late Cretaceous Nemegt Basin of Mongolia.

Data in brief·2018
Same author

Involvement of opioid signaling in food preference and motivation: Studies in laboratory animals.

Progress in brain research·2016

相关实验视频

Updated: Jun 29, 2026

Assessing Species-specific Contributions To Craniofacial Development Using Quail-duck Chimeras
09:38

Assessing Species-specific Contributions To Craniofacial Development Using Quail-duck Chimeras

Published on: May 31, 2014

古生物学. 古生物学. 鸟恐龙的嘴巴是如何形成的

M A Norell1, P J Makovicky, P J Currie

  • 1American Museum of Natural History, Central Park West at 79th Street, New York, New York 10024-5192, USA. norell@amnh.org

Nature
|August 31, 2001
PubMed
概括
此摘要是机器生成的。

新的化石发现显示,早期的鸟类类恐龙,与他们的有牙的祖先不同,很可能使用他们的没有牙的嘴巴在水生环境中进行过,而不是用于狩猎大型猎物.

更多相关视频

Creating Avian Forebrain Chimeras to Assess Facial Development
04:10

Creating Avian Forebrain Chimeras to Assess Facial Development

Published on: February 18, 2021

Systematic Assessment of Mammalian Skull Specimens for Dental and Temporomandibular Joint Pathology
07:26

Systematic Assessment of Mammalian Skull Specimens for Dental and Temporomandibular Joint Pathology

Published on: August 22, 2022

相关实验视频

Last Updated: Jun 29, 2026

Assessing Species-specific Contributions To Craniofacial Development Using Quail-duck Chimeras
09:38

Assessing Species-specific Contributions To Craniofacial Development Using Quail-duck Chimeras

Published on: May 31, 2014

Creating Avian Forebrain Chimeras to Assess Facial Development
04:10

Creating Avian Forebrain Chimeras to Assess Facial Development

Published on: February 18, 2021

Systematic Assessment of Mammalian Skull Specimens for Dental and Temporomandibular Joint Pathology
07:26

Systematic Assessment of Mammalian Skull Specimens for Dental and Temporomandibular Joint Pathology

Published on: August 22, 2022

科学领域:

  • 古生物学的古生物学
  • 脊椎动物动物学 脊椎动物动物学
  • 中生代生态系统 中生代生态系统

背景情况:

  • 甲类恐龙 (Ornithomimids) 是一个来自白纪的多样化类恐龙群.
  • 原始的鸟类类动物拥有牙,而衍生形式进化了没有牙的嘴巴.
  • 衍生类鸟类类动物中无牙的的功能一直是关于它们的饮食的争论的主题.

研究的目的:

  • 通过分析的软组织结构来研究衍生类鸟类类的饮食习惯.
  • 为这些专业恐龙的古生态和食策略提供新的见解.

主要方法:

  • 描述了两种新发现的鸟类虫标本.
  • 对这些标本的嘴内保存的软组织结构的分析.

主要成果:

  • 研究的鸟类类的嘴巴表现出与过器养机制一致的特征.
  • 有证据表明,这些恐龙在水环境中食,从沉积物中汲取食物.
  • 这些发现表明,它们与以前对一些鸟类类类动物提出的捕食性食策略有所不同.

结论:

  • 衍生类鸟类类可能使用它们的子在水生息地进行专门的过.
  • 这种适应性代表了鸟类虫系内的重要饮食转变.
  • 这项研究增强了我们对白纪时期恐龙食多样性的理解.