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Related Concept Videos

Introduction to Connective Tissues01:11

Introduction to Connective Tissues

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, osteocytes,...
Connective Tissue Cell Types01:22

Connective Tissue Cell Types

Connective tissue develops from the mesoderm of a developing embryo and consists of cells, fibers, and ground substance: a gel-like material containing large complexes of carbohydrates and proteins. Connective tissue was first identified as a separate tissue family in the 18th century, and Johannes Peter Muller coined the term connective tissue.
Fat cells (adipocytes), smooth muscle cells (myoblasts), and bone cells (osteoblasts) are some connective tissue cell types. Some immune system cells...
Loose Connective Tissue01:26

Loose Connective Tissue

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...
Overview of Connective Tissues Proper01:25

Overview of Connective Tissues Proper

Connective tissue proper is a class of connective tissue that encompasses all mature connective tissues except bone, cartilage, blood, and lymph. This extensive class of tissues has two subclasses — loose and dense connective tissues — classified based on the protein fiber arrangement and the amount of ground substance. 
The loose connective tissues have a meshwork of thin collagen and elastin fibers, which provide tensile strength for support and enough elasticity to move cells. They have...
Functions of Connective Tissues01:17

Functions of Connective Tissues

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.
Dense Connective Tissue01:13

Dense Connective Tissue

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...

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Related Experiment Video

Updated: May 21, 2026

Engineering Tendon Assembloids to Probe Cellular Crosstalk in Disease and Repair
08:32

Engineering Tendon Assembloids to Probe Cellular Crosstalk in Disease and Repair

Published on: March 22, 2024

Overlap connective tissue disease syndromes.

Luca Iaccarino1, Mariele Gatto, Silvano Bettio

  • 1Division of Rheumatology, Department of Medicine, University of Padua, Italy.

Autoimmunity Reviews
|June 30, 2012
PubMed
Summary

Overlap Syndromes (OSs) occur when patients meet criteria for two or more connective tissue diseases (CTDs). Specific autoantibodies in some OS suggest distinct clinical entities, differing from single CTDs.

Related Experiment Videos

Last Updated: May 21, 2026

Engineering Tendon Assembloids to Probe Cellular Crosstalk in Disease and Repair
08:32

Engineering Tendon Assembloids to Probe Cellular Crosstalk in Disease and Repair

Published on: March 22, 2024

Area of Science:

  • Rheumatology
  • Immunology
  • Internal Medicine

Background:

  • Overlap Syndromes (OSs) are defined by fulfilling criteria for ≥2 connective tissue diseases (CTDs) like SLE, RA, SSc, PDM, and SS.
  • Specific autoantibodies in some OSs suggest they are distinct clinical entities, not mere co-occurrences of CTDs.
  • Clinical manifestations in OSs can differ from those of individual CTDs.

Purpose of the Study:

  • To describe common OSs, focusing on their unique immunologic and clinical features.
  • To present personal data on anti-t-RNA synthetase syndrome and rhupus syndrome.

Main Methods:

  • Review of literature on Overlap Syndromes.
  • Analysis of immunologic markers and clinical characteristics.
  • Presentation of case data for specific OSs.

Main Results:

  • OSs represent complex presentations of CTDs with potentially unique clinical and immunological profiles.
  • Anti-t-RNA synthetase antibodies are associated with a specific OS.
  • Rhupus syndrome is another example of an OS discussed.

Conclusions:

  • OSs are recognized clinical entities requiring specific diagnostic and therapeutic approaches.
  • Understanding the immunologic basis of OSs is crucial for targeted treatment.
  • Further research into OSs, including anti-t-RNA synthetase and rhupus syndromes, is warranted.