A retinaculum (: retinacula) is a band of thickened deep fascia around tendons that holds them in place. It is not part of any muscle and primarily functions to stabilize tendons. 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

References