An in vivo study of the musculoaponeurotic architecture of masseter muscle

Publication date: January 2019Source: Oral Surgery, Oral Medicine, Oral Pathology and Oral Radiology, Volume 127, Issue 1Author(s): T.I. GHEORGHE, R. LEEKAM, E.W.N. LAM, S.E. PERSCHBACHER, B. LIEBGOTT, A.M.R. AGUREthical ReviewApproval for this study was received from the Health Sciences Research Ethics Board, University of Toronto (Toronto, ON, Canada).BackgroundThe masseter muscle (MM) is affected in conditions with chronic and acute facial pain. It has been suggested that architectural changes occur in the contractile and connective tissue elements of MM in these patients.1 Muscle architecture is defined as the arrangement of the contractile and connective tissue elements in the muscle volume and quantifiable parameters, including fiber bundle length (FBL) and pennation angle (PA). A cadaveric study of detailed 3-dimensional, laminar MM architecture was conducted in our laboratory.2 Cadaveric studies have been used as a basis to develop ultrasound (US) protocols used in in vivo investigations of the architecture of supraspinatus.3,4 US studies investigating MM architecture are scarce, and such parameters as FBL and PA have not been quantified in vivo. To understand the pathologic changes in MM, it is necessary to elucidate the normal musculoaponeurotic architecture.Objective(s)To investigate the in vivo musculoaponeurotic architecture throughout the volume of MM in asymptomatic participants (ages 20–40 years) with US in the relaxed and maximally contracted states. We hyp...
Source: Oral Surgery, Oral Medicine, Oral Pathology and Oral Radiology - Category: ENT & OMF Source Type: research