962 



INDEX 



M uscle (s ) — (Continued) 



intertransversarii, in human embryo, 714 

 of frog, 707 



levatores costarum, of human embryo, 

 714 



longissimus dorsi, in human embryo, 714 

 of frog, 707 



longus capitis in human, 715 



longus colli in human, 715 



masseter, 708, 111 



multifidus, of human embryo, 715 



oblique, external of scrotum, 12 

 internal of scrotum, 12 



obliquus abdominis externus in human, 

 715 



obliquus abdominis internus in human, 

 715 



obliquus externus, of Necturus, 701 



obliquus externus superficialis, of frog, 

 707 



obliquus inferior of eye, 716 



obliquus internus, of Necturus, 707 



obliquus superior of eye, 716 



of cloacal and perineal area, 715 



of head-pharyngeal area, development 

 of, 716 



of post-branchial area, development of, 

 717 



of tail region, development of, 715 



of tongue, 717 



of trunk and tail, characteristics and de- 

 velopment of, 705 



of visceral skeleton, development of, 717 



pyramidalis, 716 



quadratus, 716 



quadratus femoris, 701 



rectus abdominis, 715 

 of frog, 707 

 of Necturus, 707 



rectus externus (posterius or lateralis) 

 of eye, 716 



rectus inferior of eye, 716 



rectus internus (anterius) of eye, 716 



rectus superior of eye, 716 



retractor oculi of eye, 716 



rotatores, in human embryo, 714 



semitendinosus, 701 



serratus posterior inferior in human, 715 



serratus posterior superior in human, 715 



skeletal (striated), 700 

 histogenesis of, 702 

 types of muscle fibers in, 700 



smooth. 700 



characteristics of, 701 

 histogenesis of, 704 



somitic, development of in various ver- 

 tebrates, 708 



sphincter colli, of birds, 717 



Muscle (s) — (Continued) 



spinalis dorsi, of human embryo, 714 



transversus, 12 



transversus abdominis in human, 715 



transversus, of frog, 707 

 Muscle column, of visceral arch, 619 

 Muscle fibers, 700 



relation of to tendinous attachment, 701 

 Muscle septa (Myosepta; Myocommata), 



706 

 Muscle tissues, arrangement of, 704 



general structure of, 700 



histogenesis of, 702 



structure of, 703 

 Muscular contraction, as a means of sperm 



transport, 193 

 Muscular system, definition of, 699, 700 



morphogenesis of, 705 

 Musculature, adaptations of, 706 



of mammalian diaphragm, origin of, 718 



of paired appendages, origin of, 718 

 Mus musculus (mouse), characteristics of 

 egg, site of fertilization, and place 

 of sperm entrance into egg, 206t 

 Muskox, effect of testosterone on, 27 

 Mustelus laevis, dogfish, placenta of , 9 1 3, 9 1 7 

 Myelencephalon, 822 

 Myelin-emergent fiber, 819 

 Myelin (Medullary) sheath, 819 

 Myelinated fibers, 820 

 Mylohyoid muscle, 717 

 Myoblast, 702 



Myocardial primordium, 703 

 Myocardium, 703 

 Myocoels. 526. 858 

 Myocommata (Myosepta), 706 

 Myofibrils, 700 



arrangement of in skeletal muscle, 700 



fine, of smooth muscle. 702 

 Myoglial fibers, 704 



Myoglial fibrils, of smooth muscle, 702 

 Myosepta (Myocommata), 706 

 Myotome, 506, 711 



differentiation of, in fishes and 

 amphibia. 714 



truncal, differentiation of in higher ver- 

 tebrates, 714 

 Mystacoceti, xxi 



Myxine glutinosa, hagfish, formation of 

 adipose tissue in, 664 



yolk sac of, 908 

 Myzostoma glahrum, fertilization in, 261 



origin of centrioles in first cleavage in, 

 261 



N 

 Niigeli, "idioplasm theory" of, 215 

 Nail field, of developing finger nail, 584 



