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相关概念视频

Types of Selection01:46

Types of Selection

Natural selection influences the frequencies of particular alleles and phenotypes within populations in several different ways. Primarily, natural selection can be directional, stabilizing, or disruptive. Directional selection favors one extreme trait and shifts the population towards that phenotype while selecting against individuals displaying alternate traits. Stabilizing selection favors an intermediate trait with a narrow range of variation. Deviation from the optimal phenotype towards an...
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: Superior and Posterior View01:14

Cranial Bones: Superior and Posterior View

The superior view of the cranium shows the frontal and paired parietal bones.
The frontal bone is the single bone that forms the forehead. At its anterior midline, between the eyebrows, there is a slight depression called the glabella. The frontal bone also forms the supraorbital margin of the orbit. Near the middle of this margin is the supraorbital foramen, the opening that provides passage for a sensory nerve to the forehead. The frontal bone is thickened just above each supraorbital margin,...
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.

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相关实验视频

Updated: Jun 30, 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

牙 在 ichthyornis (类:鸟类) 中.

L D Martin, J D Stewart

    Science (New York, N.Y.)
    |March 25, 1977
    PubMed
    概括
    此摘要是机器生成的。

    像Ichthyornis和Hesperornis这样的有牙的鸟类有平坦的牙. 新的化石表明,Ichthyornis的牙是在槽中,而不是槽,可能随着年龄的变化而变化.

    更多相关视频

    Dissection and Flat-mounting of the Threespine Stickleback Branchial Skeleton
    08:02

    Dissection and Flat-mounting of the Threespine Stickleback Branchial Skeleton

    Published on: May 7, 2016

    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 30, 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

    Dissection and Flat-mounting of the Threespine Stickleback Branchial Skeleton
    08:02

    Dissection and Flat-mounting of the Threespine Stickleback Branchial Skeleton

    Published on: May 7, 2016

    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

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    科学领域:

    • 古生物学的古生物学
    • 进化生物学 进化生物学
    • 脊椎动物动物学 脊椎动物动物学

    背景情况:

    • 赫斯佩罗尼斯 (Hesperornis) 和伊希索尼斯 (Ichthyornis) 是已经灭绝的牙鸟类.
    • 这些鸟类和古鸟类 (Archaeopteryx) 拥有独特的平坦牙,其根部扩展.
    • 以前的理解表明,Ichthyornis的牙是插座的,类似于Archaeopteryx.

    研究的目的:

    • 为了调查Ichthyornis的牙植入.
    • 为了比较Hesperornis,Ichthyornis和Archaeopteryx之间的牙形态和植入.
    • 为了确定鸟类的牙是否存在牙的存在取决于年龄.

    主要方法:

    • 化石鸟类牙的比较分析.
    • 对新的Ichthyornis化石标本的检查.
    • 牙根和结构的形态评估.

    主要成果:

    • 新的Ichthyornis标本揭示了牙被设置在一个槽,而不是插座.
    • 这与之前的报道形成鲜明对比,并且与Hesperornis的牙植入一致.
    • 研究的Ichthyornis化石来自一个成年,但不是年龄的个体.

    结论:

    • 在Ichthyornis中植入牙似乎是一个槽,而不是插座,类型.
    • 鸟类牙的存在或不存在可能会受到年龄的影响.
    • 这一发现为鸟类牙进化提供了新的见解.