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Related Concept Videos

Changes in the Appendicular Skeleton with Age01:09

Changes in the Appendicular Skeleton with Age

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...
Bone Formation by Intramembranous Ossification01:29

Bone Formation by Intramembranous Ossification

Intramembranous ossification is one of the two processes involved in the development of bones within an embryo. The flat bones of the face, most of the cranial bones, and the clavicles are formed via this process. During intramembranous ossification, the bones develop directly from sheets of undifferentiated mesenchymal connective tissue.
The process begins when mesenchymal cells in the embryonic skeleton gather together and differentiate into osteogenic cells, which then develop into...
Development of the Limb Synovial Joints01:07

Development of the Limb Synovial Joints

Joints form during embryonic development in conjunction with the formation and growth of the associated bones. The embryonic tissue that gives rise to all bones, cartilage, and connective tissues of the body is called mesenchyme.
The mesenchymal stem cells differentiate into chondrocytes that form the hyaline cartilage, and later the cartilaginous model of the bone. This model further transforms into a bone. This process is known as endochondral ossification.
During development, the limbs...
Bone Formation by Endochondral Ossification01:24

Bone Formation by Endochondral Ossification

Bone formation, or ossification, begins around the sixth to seventh week of embryonic development. Most bones develop from a cartilaginous template through the process of endochondral ossification. Cartilage formation begins when clusters of mesenchymal cells differentiate into chondrocytes. These chondrocytes proliferate rapidly and secrete an extracellular matrix that becomes encased in a membrane called the perichondrium. The resulting cartilage model provides a template that resembles the...
Introduction to the Skeletal System01:20

Introduction to the Skeletal System

The skeletal system is the central framework of the body, consisting of different connective tissues: bones, cartilage, tendons, and ligaments.
Components of the Skeletal System
Bone, or osseous tissue, is a hard connective tissue that forms an internal support structure for the human body. Bones shield vulnerable organs and soft tissue from external forces. For example, the vertebral bones protect and support the spinal cord.
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Overview of Hematopoiesis01:20

Overview of Hematopoiesis

Hematopoiesis, or blood cell production, is a vital biological process that begins early in embryonic development and continues throughout life. This process generates the various types of cells found in blood, including red blood cells, white blood cells, and platelets from hematopoietic stem cells (HSCs).
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Initially, HSCs are formed in the embryonic yolk sac, a critical site for early blood cell production. These stem cells subsequently migrate to other...

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Indirect Immunofluorescence on Frozen Sections of Mouse Mammary Gland
11:13

Indirect Immunofluorescence on Frozen Sections of Mouse Mammary Gland

Published on: December 1, 2015

Human breast development.

Barry A Gusterson1, Torsten Stein

  • 1Institute of Cancer Sciences, College of MVLS, Glasgow University, Scotland, UK. barry.gusterson@glasgow.ac.uk

Seminars in Cell & Developmental Biology
|March 20, 2012
PubMed
Summary
This summary is machine-generated.

Understanding human breast development is crucial for breast cancer origins. Current knowledge is limited, especially regarding stem cells, due to ethical and tissue acquisition challenges.

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Area of Science:

  • Reproductive biology and oncology.
  • Developmental biology and cancer research.

Background:

  • Current understanding of human breast development is largely based on morphological and static assessments.
  • Limited research exists, necessitating caution when extrapolating findings from animal models, particularly mice.
  • There is a growing focus on identifying normal breast stem cells as potential targets for breast cancer initiation.

Purpose of the Study:

  • To provide an overview of the current state of knowledge regarding human breast development.
  • To highlight the limitations in our understanding of human breast development and its connection to breast cancer origins.
  • To emphasize the need for further research into normal breast development, particularly stem cell biology.

Main Methods:

  • Review of existing world literature on human breast development.
  • Analysis of the limitations in current research methodologies.
  • Discussion of ethical and practical challenges in acquiring human breast tissue for study.

Main Results:

  • Significant gaps exist in the comprehensive understanding of human breast development.
  • Ethical considerations and difficulties in tissue acquisition present major obstacles to research.
  • The role of normal breast stem cells in breast cancer initiation requires further investigation.

Conclusions:

  • A deeper understanding of normal human breast development is a priority for elucidating breast cancer origins.
  • Overcoming research barriers is essential for advancing knowledge in this field.
  • Further research is needed to bridge the gap between normal development and cancer initiation, particularly concerning stem cell behavior.