develops from ends during starts during death mandibular head muscle m. levator mandibulae longus superficialis eriksegerdell Muscle that is part a complex that arises from the skull roof and acts to elevate or close the lower jaw. The first mandibular arch muscle to appear, it originates ventral to the center of the eye, and extends rostroventrally to end lateral to the buccal cavity. superior long mandibular levator muscle XAO:0004330 xenopus_anatomy mlmls 2012-05-05T05:15:00Z m. levator mandibulae longus superior primordium NF stage 37 and 38