. Text-book of embryology. Embryology. clI. ==w being now still thicker and the whole fibre having assumed the shape of a mace. In the expanded head portion of the mace the cross striation is becoming closer, while in the slender handle the striation is becoming blurred and in the portion next the head is almost disappearing. The end-plate forms a very definite layer of uniform thick- ness covering the truncated an- terior end of the mace. It is crowded with large nuclei and to it pass nerve-fibres which show a regular dichotomous branching. In the fibre shown in Fig. 118, D, taken from th
. Text-book of embryology. Embryology. clI. ==w being now still thicker and the whole fibre having assumed the shape of a mace. In the expanded head portion of the mace the cross striation is becoming closer, while in the slender handle the striation is becoming blurred and in the portion next the head is almost disappearing. The end-plate forms a very definite layer of uniform thick- ness covering the truncated an- terior end of the mace. It is crowded with large nuclei and to it pass nerve-fibres which show a regular dichotomous branching. In the fibre shown in Fig. 118, D, taken from the same 10 cm. embryo, the head of the mace is still more ex- panded as compared with the stem. The main portion of the head, in which the muscle striation had become closer, now forms a thick plate bent into a Fig. 118.—Development of the electric organ of Raia batis. (After Ewart, 1888.) A and B from an embryo slightly over V cm. in length; C and D from an embryo about 10 cm. in length; E, from a specimen about 67 cm. in length, , alveolar layer ; , electric layer; el, electrolemma; , nerve-fibres ; s,l, striated layer; t, vestigial remains of Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original MacBride, E. W. (Ernest William), 1866-1940; Kerr, John Graham, 1869-; Heape, Walter, 1855-1929. London : Macmillan
Size: 1244px × 2007px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, bookpubli, booksubjectembryology
