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. 2017 Nov 21;232(2):214–226. doi: 10.1111/joa.12746

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© 2017 Anatomical Society

PMC Copyright notice

Lateral view of Phyrnosoma ditmarsi displaying successive layers of jaw musculature visible during dissection after removal of the skin. Phrynosoma ditmarsi is representative of species exhibiting enlarged jaw‐closing muscles and reduced jaw‐opening muscles. Muscles and skeletal elements are abbreviated as follows: CM, M. cervicomandibularis; DM, M. depressor mandibulae; LAO, M. levator anguli oris; AMESA, M. adductor mandibulae externus superficialis anterior; AMESP, M. adductor mandiblae externus superficialis posterior; AMEM, M. adductor mandibulae externus medialis; AMEP, M. adductor mandibulae externus profundus; AMP, M. adductor mandibulae posterior; PsTS, M. pseudotemporalis superficialis; PsTP, M. pseudotemporalis profundus; PTM, M. pterygoideus pars medialis; SQ, squamosal; JU, jugal; QD, quadrate; JML, jugal mandibular ligament.