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Connective tissue is one of the four primary types of animal tissue, alongside epithelial tissue, muscle tissue, and nervous tissue. It primarily develops from the mesenchyme, which is derived from the mesoderm, the middle embryonic germ layer.
Connective tissue is found between other tissues throughout the body, including within the nervous system. Notably, the three meninges - membranes that envelop the brain and spinal cord - are composed of connective tissue.
Most types of connective tissue consist of three main components:
Blood and lymph are classified as specialized fluid connective tissues that do not contain fibers. All connective tissues are immersed in body water.
The cells of connective tissue include:
Biga et al. 2019
Biga et al. 2019a Anatomy & Physiology, OpenStax/Oregon State University, retrieved 16 April 2021