All cailages are covered by perichondrium except

Perichondrium is a membrane made of connective tissue that covers cailage. In adults, it covers hyaline cailage in the larynx (voice box), trachea (windpipe), nose and ribs (costal cailage ), and elastic cailage in the external ear (auricular cailage), epiglottis and eustachian tubes. In adults, it is absent in the aicular cailage in the joints and fibrocailage in the joint capsules, at the attachment points of tendons and ligaments to bones and in the interveebral discs in the spine.Functions of perichondrium: Contributes to appositional cailage growth and repair. Fibrocailage cailage, which lacks perichondrium undergoes interstitial growth. In early bone development, perichondrium might serve as a reservoir of mesenchymal stem cells. Cailage nourishment. (Ref: Inderbir Singh&;s Histology, 7th edition, Cailage pg 80)