GLOSSARY. 87 



Mus'culus choanoi'des (Gr. choane, funnel; eidos, shape). A 

 funnel-shaped muscle which, in some reptiles and mam- 

 mals, lies within the four recti muscles of the eye, and is 

 attached to the posterior part of the eyeball. 



Mu'tica (L. mutilus, wanting some principal part). A group 

 of insectivorous Edentata, devoid (or nearly so) of teeth. 



Mycelium (Gr. mukes, a fungus, a mushroom). The structure 

 formed by the interlacement of the hyphse of fungi. 



Myelence'phalon (Gr. muelos, marrow ; enktphalon, the brain). 

 Another term for the medulla oblongata. 



My'elon (Gr. muelos, marrow). The spinal cord. 



My'eloplaques (Gr. muelos, marrow ; Fr. plaque, plate). Large 

 nucleated protoplasmic masses which occur in the marrow 

 of bones. 



My'lo-glos'sus muscle (Gr. mule, a mill ; glossa, the tongue). 

 A small occasional muscle of the lower jaw. 



My'lo-hy'oid (Gr. mule, a mill ; hyoid bone}. The name of a 

 muscle of the lower jaw ; also of the nerve, artery, and 

 vein supplying that muscle, and of the groove in which the 

 nerve and blood-vessels run ; also of the ridge in the lower 

 jaw to which the mylo-hyoid muscle is attached. 



Myogra'phioir (Gr. mus, a muscle ; grapho, I write). An 

 instrument by which the rapidity of the passage of an im- 

 pulse along a nerve is determined, by noticing the time at 

 which a muscle contracts after application of stimuli to 

 different parts of the nerve supplying it. 



Myolem'ma (Gr. mus, a muscle ; lemma, a husk or rind). 

 The sheath of a striped muscular fibre, usually termed 

 sarcolemma. 



Myology ( Gr. mus, a muscle ; logos, a discourse). The branch 

 of Anatomy which is concerned with the structure and 

 distribution of the muscles. The muscular system of an 

 animal regarded as a whole. 



Myoinor'pha (Gr. mus, muos, mouse ; morphe, form). A group 

 of Rodents which comprises the rats. 



My'opy 1 1 ( Gr< mu & s > short-sighted). Short-sightedness. 



My'osin (Gr. mus, a muscle). The chief nitrogenous con- 

 stituent of dead muscle, formed in the process of coagula- 

 tion which takes place in rigor mortis. 



My'otome (Gr. mus, a muscle; temno, I divide). Segments 

 of which the muscles of fishes, and probably of all verte- 

 brate embryos, are made up. 



