Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Signs of Puberty01:27

Signs of Puberty

455
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)...
455
Development of the Sexual Organs in the Embryo and Fetus01:15

Development of the Sexual Organs in the Embryo and Fetus

914
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...
914
The Fossil Record02:56

The Fossil Record

25.3K
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...
25.3K
The Y Chromosome Determines Maleness02:19

The Y Chromosome Determines Maleness

6.7K
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.
Evolution
Around 300 million years ago, the two sex chromosomes diverged from two identical autosomal chromosomes. Over time, the Y chromosome has lost most of its genes, shrinking in size....
6.7K
Gastrulation01:56

Gastrulation

57.7K
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...
57.7K
Changes in the Appendicular Skeleton with Age01:09

Changes in the Appendicular Skeleton with Age

2.1K
The upper and lower limb initially develops as a small bulge called a limb bud, which appears on the lateral side of the early embryo. The upper limb bud appears near the end of the fourth week of development, with the lower limb bud appearing shortly after.
Initially, the limb buds consist of a core of mesenchyme covered by a layer of ectoderm. The ectoderm at the end of the limb bud thickens to form a narrow crest called the apical ectodermal ridge. This ridge stimulates the underlying...
2.1K

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Effect of angiotensin II and angiotensin II type 1 receptor antagonist on the proliferation, contraction and collagen synthesis in rat hepatic stellate cells.

Chinese medical journal·2008
Same author

[Determination of nicotinamide in formula milk powder using liquid chromatography-isotope dilution mass spectrometry].

Se pu = Chinese journal of chromatography·2008
Same author

In vivo tracking of superparamagnetic iron oxide nanoparticle-labeled mesenchymal stem cell tropism to malignant gliomas using magnetic resonance imaging. Laboratory investigation.

Journal of neurosurgery·2008
Same author

Enhancement and broadening of extreme-ultraviolet supercontinuum in a relative phase controlled two-color laser field.

Optics letters·2008
Same author

Screening and breeding of high taxol producing fungi by genome shuffling.

Science in China. Series C, Life sciences·2008
Same author

Reversible self-association of a concentrated monoclonal antibody solution mediated by Fab-Fab interaction that impacts solution viscosity.

Journal of pharmaceutical sciences·2008
Same journal

Hunting ecology predicts eye arrangements in the modular visual system of spiders.

Current biology : CB·2026
Same journal

Sub-second fluctuations between top-down and bottom-up modes distinguish diverse human brain states.

Current biology : CB·2026
Same journal

Queen bees offload pesticide burden to eggs when social buffering is overwhelmed.

Current biology : CB·2026
Same journal

Pitch selectivity in ferret auditory cortex.

Current biology : CB·2026
Same journal

A cell size-dependent competition between geometry and polarity governs nuclear and spindle positioning in early embryos.

Current biology : CB·2026
Same journal

Trophic cascades drive sustainability in the agricultural heritage rice-fish coculture system.

Current biology : CB·2026
See all related articles

Related Experiment Video

Updated: Jul 25, 2025

Creating Avian Forebrain Chimeras to Assess Facial Development
04:10

Creating Avian Forebrain Chimeras to Assess Facial Development

Published on: February 18, 2021

1.2K

Puberty in a Mesozoic reptile.

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
Summary
This summary is machine-generated.

Puberty was identified in the fossil reptile Keichousaurus using bone histology. This study reveals the first evidence of puberty in a fossil amniote, offering insights into reptilian life history.

More Related Videos

Two-step Approach to Explore Early- and Late-stages of Organ Formation in the Avian Model: The Thymus and Parathyroid Glands Organogenesis Paradigm
13:43

Two-step Approach to Explore Early- and Late-stages of Organ Formation in the Avian Model: The Thymus and Parathyroid Glands Organogenesis Paradigm

Published on: June 17, 2018

7.5K
Author Spotlight: Insight into the Current Experimental Avian Skin Explant Methodologies
09:30

Author Spotlight: Insight into the Current Experimental Avian Skin Explant Methodologies

Published on: September 15, 2023

1.2K

Related Experiment Videos

Last Updated: Jul 25, 2025

Creating Avian Forebrain Chimeras to Assess Facial Development
04:10

Creating Avian Forebrain Chimeras to Assess Facial Development

Published on: February 18, 2021

1.2K
Two-step Approach to Explore Early- and Late-stages of Organ Formation in the Avian Model: The Thymus and Parathyroid Glands Organogenesis Paradigm
13:43

Two-step Approach to Explore Early- and Late-stages of Organ Formation in the Avian Model: The Thymus and Parathyroid Glands Organogenesis Paradigm

Published on: June 17, 2018

7.5K
Author Spotlight: Insight into the Current Experimental Avian Skin Explant Methodologies
09:30

Author Spotlight: Insight into the Current Experimental Avian Skin Explant Methodologies

Published on: September 15, 2023

1.2K

Area of Science:

  • Paleontology
  • Vertebrate Paleontology
  • Paleohistology

Background:

  • Bone histology preserves long-term growth records in fossils.
  • Puberty, a critical life stage, is well-documented in extant vertebrates but poorly understood in fossil taxa.
  • Keichousaurus was a small, live-bearing marine reptile from the Middle Triassic.

Purpose of the Study:

  • To investigate the presence and characteristics of puberty in the fossil reptile Keichousaurus.
  • To utilize bone histology and morphology to identify life stages in fossil vertebrates.
  • To provide the first report of puberty in a fossil amniote.

Main Methods:

  • Analysis of bone histology and morphology of Keichousaurus humeri.
  • Identification of four distinct life stages: fetus, juvenile, puberty, and adult.
  • Comparison of male and female adult humerus morphology, including shaft cross-section and muscle attachment sites.

Main Results:

  • Puberty was identified as a distinct life stage in Keichousaurus, alongside fetus, juvenile, and adult.
  • Adult male Keichousaurus humeri are more robust than females, with pronounced muscle attachments and a triangular shaft cross-section.
  • A transition from a rounded juvenile to a triangular adult humerus cross-section was observed in males, reflecting differential periosteal bone apposition during puberty.

Conclusions:

  • Bone histology provides a reliable method for detecting puberty in fossil reptiles.
  • Hormonal and biomechanical factors likely influenced the observed skeletal changes during Keichousaurus puberty.
  • This study establishes the first evidence of puberty in a fossil amniote, expanding our understanding of reptilian reproductive biology and life history.