Retinaculum

A retinaculum (pl.: retinacula) is a band of thickened deep fascia around tendons that holds them in place. It is not part of any muscle. Its function is mostly to stabilize a tendon. The term retinaculum is Neo-Latin, derived from the Latin verb retinere (to retain). Specific retinacula include:

In the wrist:
- Flexor retinaculum of the hand
- Extensor retinaculum of the hand
In the ankle:
- Flexor retinaculum of foot
- Superior extensor retinaculum of foot
- Inferior extensor retinaculum of foot
- Superior fibular retinaculum
- Inferior fibular retinaculum
In the knee:
- Lateral retinaculum
- Medial patellar retinaculum

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