The anatomical record . eeper end of the memlirane i)artition, and its processruns straight out, , radially, between the adjacent barb-vaneritlges. No such process was found extending more than three-fourths the radial extent of the ailjacent ridges. ^^e are unable to explain the location and behavior of thesemelanophores. They are so rare that we have considered themmore or less abnormal. In the region where they occur, variousfeatures indicate activitv in a radial direction Here and more Ktti K. M. STKONU imiximally, tlu> cells of the syncytial cijitlK*!!!!!!! arc undorKoinR
The anatomical record . eeper end of the memlirane i)artition, and its processruns straight out, , radially, between the adjacent barb-vaneritlges. No such process was found extending more than three-fourths the radial extent of the ailjacent ridges. ^^e are unable to explain the location and behavior of thesemelanophores. They are so rare that we have considered themmore or less abnormal. In the region where they occur, variousfeatures indicate activitv in a radial direction Here and more Ktti K. M. STKONU imiximally, tlu> cells of the syncytial cijitlK*!!!!!!! arc undorKoinRcoiisuhral)lc chaiiRes in position. Proxinuiliy, pale refractionlines simulating inconiplcto cell boundaries lie radially betweenthe nuclei, which are narrow and arranged radially. In figure 5such lines have l)een drawn for the deepest nuclei at the have not i)een ol)served to form comi)lete cell boundaries ,Interrnedi ate ce Inter mediate cell layer\ Cvlmoei^ceu layer Basemenl membraneextension melanopnore. _ Fig. 6 Sninll portion of transverse section from feather germ of PlymouthRook fowl. Near level n in (igiirc 1. X 700. Drawn with aid of camera liicidaand reduced in pviVilieation. Oc. 10; oI>j. mm. oil immersion, (Raiisch andIx)ml>i. .\ Imwment membrane extension separating two barb-vane ridges isshown with a dermal melanophore process lying in its inner two thirds. Thecell body of the melanophore is only partly in this section. Adjacent ofcylinder cells and iiiiiriiHili:iti> cells ,iri- imlic-itnl by their nuclei. often if ever, and they disappear at the level where the radiallydirected basement membrane extensions develop. The frccjuentoccurrence of melanin pigment only on the outer side of nuclei,mentioned in this paper, is very likely another illustration ofradially acting forces. It is conceivable that melanophore proc-e.«<ses tire carried radially by such forces or by the developingbarb-vane extensions of the bas
Size: 1128px × 2214px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjectanatomy, bookyear1906
