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Related Concept Videos

Introduction to Connective Tissues01:11

Introduction to Connective Tissues

15.6K
Connective tissues are one of the four main tissue types in humans that are extensively present in the body. They are characterized by cells embedded in an extracellular matrix (ECM) composed of a ground substance and three main types of protein fibers— collagen, elastic, and reticular fibers. The ground substance of connective tissues can range from a watery and jelly-like consistency to mineralized and hard. The wide variety of cells in the connective tissues include fibroblasts,...
15.6K
Classification of Connective Tissues01:30

Classification of Connective Tissues

16.5K
The connective tissues have different properties and functions in the human body. They are broadly categorized into proper, supporting, or fluid connective tissues.
Connective Tissue Proper
Connective tissue proper is the most abundant class of connective tissues. As its name implies, it predominantly connects different tissues in the body. Depending on the cell types, ground substance, viscosity, and fiber types in the ECM, connective tissue proper is further categorized into loose and dense....
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Embryonic Connective Tissues01:20

Embryonic Connective Tissues

6.7K
During early development, the embryo forms two types of connective tissues— the mesenchyme and mucoid connective tissue.
The mesenchyme is the first connective tissue that emerges in the developing embryo. It consists of loosely arranged multipotent mesenchymal cells and reticular fibers in the extracellular matrix. This loose arrangement allows easy migration of cells, which is essential for germ layer positioning, patterning, and organ morphogenesis during embryonic development.
6.7K
Dense Connective Tissue01:13

Dense Connective Tissue

12.6K
Dense connective tissue contains more collagen fibers than loose connective tissue. As a consequence, it displays greater resistance to stretching. There are two major categories of dense connective tissue— regular and irregular.
Dense Regular Connective Tissue
In dense regular connective tissue, fibers are arranged parallel to each other, enhancing its tensile strength and resistance to stretching in the direction of the fiber orientations. Ligaments and tendons are made of dense regular...
12.6K
Functions of Connective Tissues01:17

Functions of Connective Tissues

17.5K
Connective tissues perform a broad range of functions in the body. Their primary function is to connect and link different tissues in the body and act as packaging material between tissues. The areolar tissue, a connective tissue prototype, commonly cements various tissue types in diverse body organs. In contrast, adipose tissue cushions internal organs while insulating the body from heat loss.
Hard connective tissues, such as bones and cartilage, provide structure and support to the body.
17.5K
Loose Connective Tissue01:26

Loose Connective Tissue

10.0K
Loose connective tissue is found between many organs. Its main function is to absorb shock and bind tissues together. It also allows water, salts, and various nutrients to diffuse into cells that are embedded in it or present in adjacent tissues.
Adipose Tissue
Adipose tissue consists primarily of fat storage cells called adipocytes and little extracellular matrix. A large number of capillaries present within adipose tissue allow rapid mobilization of lipid molecules. White adipose tissue is...
10.0K

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Fibroblast Derived Human Engineered Connective Tissue for Screening Applications
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Connective tissue progenitors: practical concepts for clinical applications.

George F Muschler1, Ronald J Midura

  • 1Department of Orthopedic Surgery, The Cleveland Clinic Foundation, OH 44195, USA.

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Tissue engineering in orthopaedic surgery relies on cells, particularly stem cells, to form new tissue. Understanding cell behavior is key for designing effective cell-matrix grafts.

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Area of Science:

  • Biomedical Research
  • Tissue Engineering
  • Orthopaedic Surgery

Background:

  • Tissue engineering is an evolving field using cells, matrices, and stimuli to regenerate tissues.
  • It is increasingly applied in orthopaedic surgery for patient therapy.
  • Fundamental biologic principles, especially cell activity, underpin tissue engineering success.

Purpose of the Study:

  • To review key biologic concepts for designing cell-matrix composites in bone grafting and tissue engineering.
  • To discuss stem cell biology paradigms and potential autogenous sources.
  • To introduce a mathematical model for understanding graft site demands on stem cells.

Main Methods:

  • Review of fundamental biologic concepts in tissue engineering.
  • Discussion of stem cell biology, including self-renewal and lineage restriction.
  • Introduction of a mathematical model for graft design.

Main Results:

  • Cells, especially stem and progenitor cells, are essential for new tissue formation.
  • Understanding stem cell functions like self-renewal and lineage restriction is crucial.
  • A mathematical model aids in conceptualizing cell-matrix composite graft design.

Conclusions:

  • Effective tissue engineering, particularly in orthopaedics, hinges on cellular activity.
  • Rational design of cell-matrix grafts requires a deep understanding of stem cell biology.
  • Mathematical modeling can provide a framework for optimizing graft strategies.