Aponeurosis

[Sarah]

Any one of the thicker and denser of the deep fasciæ whichcover, invest, and the terminations and attachments of, many muscles.They often differ from tendons only in being flat and thin. SeeFascia.

[Sonia]

a thin sheet of tissue that covers a muscle or connects a muscle to the part it moves:

[Renato]

A sheet of pearly white fibrous tissue that takes the place of a tendon in flat muscles having a wide area of attachment.