aponeurosis

US /ˌæp.ə.nʊˈroʊ.sɪs/
UK /ˌæp.ə.nʊˈroʊ.sɪs/
1.

aponevroz

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

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MRI has been used to determine the thickness of the aponeurosis.