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相关概念视频

Signs of Puberty01:27

Signs of Puberty

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Puberty is a critical phase, typically beginning between the ages of 8 and 13 in girls and 9 and 14 in boys, though timing can vary based on genetics, environmental factors, and overall health. This period is characterized by the development of secondary sexual characteristics and the attainment of reproductive potential. Endocrine changes underpin puberty, with hormonal surges of Luteinizing Hormone (LH) and Follicle-Stimulating Hormone (FSH) instigated by Gonadotropin-Releasing Hormone (GnRH)...
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Development of the reproductive organs in an embryo starts from a bipotential state. This means the early embryo can develop either male or female reproductive organs. The formation of these organs begins with the growth of gonadal ridges that arise from the intermediate mesoderm during the fifth week of development.
Near the gonadal ridges, two duct systems are present: the mesonephric ducts (Wolffian ducts) and paramesonephric ducts (Müllerian ducts). These ducts form the basis for the...
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The Fossil Record02:56

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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...
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The Y Chromosome Determines Maleness02:19

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The Y chromosome is a sex chromosome found in several vertebrates and mammals, including humans. In addition to 22 pairs of autosomes, the human males have one X chromosome and one Y chromosome. In these organisms, the presence or absence of the Y chromosome determines the development of male traits.
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Gastrulation establishes the three primary tissues of an embryo: the ectoderm, mesoderm, and endoderm. This developmental process relies on a series of intricate cellular movements, which in humans transforms a flat, “bilaminar disc” composed of two cell sheets into a three-tiered structure. In the resulting embryo, the endoderm serves as the bottom layer, and stacked directly above it is the intermediate mesoderm, and then the uppermost ectoderm. Respectively, these tissue strata...
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相关实验视频

Updated: Jul 25, 2025

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在中生纪爬行动物的青春期.

Qiang Li1, Jun Liu1, Nicole Klein2

  • 1Division of Geology, School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, China; Section Paleontology, Institute of Geosciences, University of Bonn, 53115 Bonn, Germany.

Current biology : CB
|June 23, 2023
PubMed
概括

在化石爬行动物Keichousaurus中,使用骨组织学识别了青春期. 这项研究揭示了化石羊卵中青春期的第一个证据,为爬行动物的生命历史提供了洞察力.

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科学领域:

  • 古生物学的古生物学
  • 脊椎动物古生物学 脊椎动物古生物学
  • 古历史学 (paleohistology) 是一种古史学.

背景情况:

  • 骨组织学保存了化石中的长期生长记录.
  • 青春期,一个关键的生命阶段,在现存的脊椎动物中得到了充分的记录,但在化石种群中了解得很少.
  • 凯丘萨鲁斯 (Keichousaurus) 是一个小的,活着的海洋爬行动物,来自三叠纪中期.

研究的目的:

  • 为了研究化石爬行动物凯丘萨鲁斯的青春期的存在和特征.
  • 利用骨组织学和形态学来识别化石脊椎动物的生命阶段.
  • 提供第一个关于青春期在化石胚胎的报告.

主要方法:

  • 对凯丘萨鲁斯人的骨组织学和形态学的分析.
  • 确定四个不同的生命阶段:胎儿,青少年,青春期和成人.
  • 男性和女性成年人部形态的比较,包括轴横截面和肌肉附着部位.

主要成果:

  • 青春期被确定为Keichousaurus的一个独特的生命阶段,与胎儿,青少年和成年人一起.
  • 成年雄性Keichousaurus humeri比雌性更强壮,具有明显的肌肉附件和三角形轴截面.
  • 在男性中观察到,从圆形的青少年转变为三角形的成年腰椎截面,反映了青春期期间的骨骨位的差异.

结论:

  • 骨组织学提供了一种可靠的方法来检测化石爬行动物的青春期.
  • 荷尔蒙和生物机械因素可能影响了凯丘萨鲁斯青春期观察到的骨变化.
  • 这项研究证实了化石羊胚胎中第一个青春期的证据,扩大了我们对爬行动物的生殖生物学和生命史的理解.