The American journal of anatomy . the fibreshave the same direction and that the muscles cannot be reallydifferentiated until the fourth month. He adds that it is impos-sible to separate the thyreoarytaenoideus and cricoarj^taenoideuslateralis, which holds also for the child and adult. Althoughimpossible is expressing it a bit strongly yet the latter part ofthe statement is well taken, as even in the child and adult the dif-ferentiation is not always clearly manifest. The m. cricothyreoideus. Figs. 29 and 31 picture this muscle insection, and figs. 34 and 38 give the appearance in reconstructi
The American journal of anatomy . the fibreshave the same direction and that the muscles cannot be reallydifferentiated until the fourth month. He adds that it is impos-sible to separate the thyreoarytaenoideus and cricoarj^taenoideuslateralis, which holds also for the child and adult. Althoughimpossible is expressing it a bit strongly yet the latter part ofthe statement is well taken, as even in the child and adult the dif-ferentiation is not always clearly manifest. The m. cricothyreoideus. Figs. 29 and 31 picture this muscle insection, and figs. 34 and 38 give the appearance in reconstruction,both wax models and graphic representation. Its origin on theexternal surface of the arcus cartilaginis cricoideae is as in theadult. It inserts on the medial surface of the inferior margin ofthe lamina cartilagins thyreoideae. It is a well developed mus-cle with numerous evidences of fibrillations. However there isno division into a pars recta and pars obliqua as in the adult, nor DEVELOPMENT OF THE HUMAN LARYNX 55 —. Sup laty Int ar\j cii pos\ Fig. 36 Wax model of laryngeal muscles and nerves in human Embryo no. 22(20 mm.). Drawn from the posterior aspect; the thyreoid cartilage has been partlyremoved above and posteriorly to admit of clearer view of muscles and nerves. THE AMERICAN JOURNAL OP ANATOMY, VOL. 12, NO. 1
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectanatomy, bookyear1901
