The influence of masseter and temporalis sarcomere length operating ranges as determined by laser diffraction on architectural estimates of muscle force and excursion in macaques (Macaca fascicularis and Macaca mulatta).

ABSTRACT: OBJECTIVE:Determine sarcomere length (Ls) operating ranges of the superficial masseter and temporalis in vitro in a macaque model and examine the impact of position-dependent variation on Ls and architectural estimates of muscle function (i.e., fiber length, PCSA) before and after Ls-normalization. DESIGN:Heads of adult Macaca fascicularis (n = 4) and M. mulatta (n = 3) were bisected postmortem. One side of the jaw was fixed in occlusion, the other in maximum gape. Ls was measured bilaterally using laser diffraction and these measurements were used to estimate sarcomere-length operating ranges. Differences in fiber length and PCSA between sides were tested for significance prior to and following Ls-normalization. RESULTS:Sarcomere-length operating ranges were widest for the anterior superf

SUBMITTER: Taylor AB 

PROVIDER: S-EPMC6739116 | biostudies-literature | 2019 Sep

REPOSITORIES: biostudies-literature