The development of the human body; a manual of human embryology . mbryos of different ages. The appearance of the mesodermic somites is an im-portant phenomenon in the development of the embryo,since it influences fundamentally the future structure ofthe organism. If each pair of mesodermic somites beregarded as an element and termed a metamere or seg-ment, then it may be said that the body is composed of aseries of metameres, each more or less closely resemblingits fellows, and succeeding one another at regular inter-vals. Each somite differentiates, as has been stated, intoa sclerotome, a my
The development of the human body; a manual of human embryology . mbryos of different ages. The appearance of the mesodermic somites is an im-portant phenomenon in the development of the embryo,since it influences fundamentally the future structure ofthe organism. If each pair of mesodermic somites beregarded as an element and termed a metamere or seg-ment, then it may be said that the body is composed of aseries of metameres, each more or less closely resemblingits fellows, and succeeding one another at regular inter-vals. Each somite differentiates, as has been stated, intoa sclerotome, a myotome, and a cutis plate, and, accord- * See page 231. METAMERISM. 125 ingly, there will primarily be as many vertebrae, musclesegments, and cutis segments as there are mesodermicsomites, or, in other words, the axial skeleton, the volun-tary muscles, and the cutis are primarily metameric. Noris this all. Since each metamere is a distinct unit, it mustpossess its own supply of nutrition, and hence the primaryarrangement of the blood-vessels is also metameric, a. MQ
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectembryol, bookyear1902
