Soft tissue that lines the non-cartilaginous surfaces within joints with cavities (synovial joints).
Comment:
[homology-note] "Phylogenetically, synovium is one of the newer attributes of the vertebrate locomotor apparatus. The first synovial joints developed in the piscine jaw of ancestors of modern lungfish by an evolutionary process that modified preexisting fibrous and cartilaginous joints, which were the predominant articulation of the early sea- and land-dwelling vertebrates.[well established][VHOG]" xsd:string {date_retrieved="2012-09-17", external_class="VHOG:0001282", ontology="VHOG", source="PMID:11068553 O'Connel JX, Pathology of the synovium. American Journal of Clinical Pathology (2000)", source="http://bgee.unil.ch/"}
synovial layer of articular capsule of synovial joint; synovial membrane of articular capsule of synovial joint; synovium of articular capsule of synovial joint