What is the perichondrium?

Updated: 4/28/2022
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The perichondrium is a layer of dense irregular connective tissue which surrounds the cartilage of developing bone. It consists of two separate layers: an outer fibrous layer and inner chondrogenic layer. The fibrous layer contains fibroblasts, which produce collagenous fibers. The chondrogenic layer remains undifferentiated and can form chondroblasts or chondrocytes. Perichondrium can be found around the perimeter of elastic cartilage and hyaline cartilage, but not fibrocartilage. Perichondrium is a type of Irregular Collagenous Ordinary Connective Tissue, and also functions in the growth and repair of cartilage. Once vascularized, the perichondrium becomes the periosteum.

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Q: What is the perichondrium?
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Do ears have perichondrium?

Yes the ears have a perichondrium.

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Cartilage is enclosed by a layer of dense connective tissue called the perichondrium, except on the articulating surfaces in joint cavities. The perichondrium has two layers-- a fibrous outer layer and an inner layer of cells with chondrogenic (cartilage-forming) potential. The chondrogenic cells undergo division and differentiate into chondroblasts.

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Where in the body would you expect to find a perichondrium?

Peri means around and chondrium refers to cartilage. Therefore, perichondrium is a layer of dense irregular connective tissue that surrounds cartilage.

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There are no nociceptive receptors within any of the types of cartilage, but only in adjoining/surrounding perichondrium where such exists.

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Connective tissue membranes, which includes synovial membranes, meninges, fascia (superficial and deep fascia), fibrous pericardium, and perichondrium.

Why are the UFC fighters ears like that?

It's called "Cauliflower Ear". It is a condition that occurs when the external portion of the ear suffers a blow, blood clot or other collection of fluid under the perichondrium. This separates the cartilage from the overlying perichondrium that supplies its nutrients, causing it to die and resulting in the formation of fibrous tissue in the overlying skin. As a result, the outer ear becomes permanently swollen and deformed, resembling a cauliflower.

How does fibrocartilage gets its nutrition?

Hyaline Cartilage and Articular Cartilage get their nutrients through synovial or perichondrium fluid. Fibrocartilage does not have these so it gets nutrients through blood capillaries.