関節全体を覆っている結合組織で、以下の2層からなる。また、関節包の内側にある空間を関節腔といい、透明な滑液で満たされている。
「Wikipedia」には以下のような解説が見られる。
「In anatomy, an articular capsule (or joint capsule) is an envelope surrounding a synovial joint.[1]
Layers[edit]
Each capsule consists of two layers:
- an outer layer (stratum fibrosum) composed of avascular white fibrous tissue
- an inner layer (stratum synoviale) which is a secreting layer, and is usually described separately as the synovial membrane.
On the inside of the capsule, articular cartilage covers the end surfaces of the bones that articulate within that joint.
The outer layer is highly innervated by the same nerves which perforate through the adjacent muscles associated with the joint.
Fibrous membrane[edit]
The fibrous membrane of articular capsule (fibrous capsule) is attached to the whole circumference of the articular end of each bone entering into the joint, and thus entirely surrounds the articulation. It is made up of dense irregular connective tissue.」
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