muscularis n. [L. musculus, muscle] (ARTHRO: Insecta) A muscular sheath surrounding the alimentary canal.
muscular pad (ECHI) A muscular tissue pad or pads associated with the ventral setae.
muscular sheath (ARTHRO: Insecta) In Culicidae, a sheath enclosing a coelomic section of each of the ventral setae.
musculature n. [L. musculus, muscle] The system or arrangement of muscular structure of an organism.
musculus bursae basalis (NEMATA: Secernentea) Bursal muscle that arises from the ventral side of the bursa and extends dorsally to the root of the dorsal ray.
musculus costae dorsalis (NEMATA: Secernentea) A many branched bursal muscle that arises mediodorsally in the dorsal ray, and extending anteriorly to become trifurcate, then the median arm splits into four parts.
musculus costae lateralis externus anterior (NEMATA: Secernentea) Bursal muscles that arise anterior to the musculus costae lateralis externus posterior, extending posteriorly to the base of the ventral rays; possibly functioning to extend the bursa.
musculus costae lateralis externus posterior (NEMATA: Secernentea) A bursal muscle that arises anteriorly dorsad of the lateral cords, extending posteriorly and becoming trifúrcate at the base of the lateral rays; possibly functioning to extend the bursa.
musculus costerum lateralium internis (NEMATA: Se-cernentea) Bursa muscle that arises as paired submedian muscles at the body wall anterior to the intestino-rectal valve; each laterally extended branch entering the root of the lateral ray; possibly functioning to bend the bursa inwards.
mushroom bodies (ARTHRO: Insecta) The two stalked nerve structures of the protocerebrum, that are connected with the optic lobes. see corpora pedunculata.
mushroom gland (ARTHRO: Insecta) Large mushroom-shaped seminal vesicles.
mutafacient n. [L. mutatus, change; facere, to make] Gene or genetic element that causes or increases the chance of mutation at another site.
mutagen n. [L. mutare, to change; Gr. gennaein, to produce] Any physical or chemical agent that increases mutational events.
mutant n. [L. mutare, to change] An organism that undergoes mutation.
mutation n. [L. mutare, to change] A structural change in a gene, consisting of a replacement, duplication, or deletion of one or several pairs in the DNA.
mutation frequency The frequency of mutants in a population.
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