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54
næston rot notlad. Fig. (52. b. for deroftor at onde i on
traadformig Hage, Fig. 62. c. Opad i don øverste Del af
Rachis bliver Axon rund og gaar ind i Veiitralkanalon;
her gjor den, omtrent 6""" fra Endopolypens Grund, en
stærk Boining opad mod Høire, Fig. 63, a, og kommer da
lige ved Endepolypen, hvor den bøier sig nedad og til
Venstre, Fig. 63, b. for derefter S-formigt at ende i en
yderst liden Knop, Fig. 63, c. Axen har en brun Farve
og dannes af fibrillært Bindovaw. imellem hvis Fibre or
afsat en stor Mængde Kalk, saa at den er meget fast men
ogsaa meget boielig, især gjælder dette sidste dons øverste
Halvdel; i den bulbøse Del er Axon derimod saa tyk, at
den her ikke lader sig bøie. Yed et Tvorsnit visor Axon
sig. efter at være berøvet Kalken, at liave en
Central-kjernc. der er næsten korsformet eller dannet af 2 Buer,
hvis konvexe Dele løbe sammen, Fig. 61, Cl. Kjernen er
noget lysore ond do omgivende Dele. Disse dannes af
koncentriske Ringe eller Lag af Bindovævsfibriller, imellem
hvilke er en rigelig Kalkafsætning, Fig. 36, il. Lagene
overskjæres af radiære Bindova’vsfibro. der straale
divergerende ud fra Centrum mod Periphorion, Fig. 36, e, hvor
de gaa over i Axons Membrana propria. Denne er yderst
tynd. hyalin, bestaar af fibrillært Bindevæv og er med dons
indre Flade stærkt sammenvoxen til Axon, (saa at den ikke
kan skilles fra denne, uden at Dele af Axen følge med;
dons ydre Flade er vol fastvoxen til Skeden, mon
Forbindelsen er ikke saa intim; don foregaar væsentlig vod
Binde-wvvstraade, saa at der bliver Rum eller Kanaler, hvori
Ermoringswodskon flyder, Fig. 36, f.
Skeden bestaar af to Membraner; den indre er
temmelig tynd men fast og er ved sin indre Flade fastvoxen
til Axons Membrana propria (Cuticula), som tidligere
omtalt. medens dons ydre Flade er glat, har yderst fine
Aabninger og vender imod Skedens Lumen, Fig. 36, çj\
den ydre Membran er meget tyk, fast og ganske
eiendommelig, Fig. 36, i. Lige fra Rachis og til Begyndelsen af
den bulbøse Del er den ydre Membran ganske fri paa sin
indre Flade, der or glat, gjennomboret af tine Aabninger
og har et trekantet Fremspring paa alle 4 Sider, hvilket
svarer til Axefurons Yinkel, som det mvsten udfylder, Fig.
61. b. Imellem den indre Membrans ydre Flade og den
ydre Membrans indre Flade er saaledes et Ruin rundt hele
Axen, Fig. 61. ti. der udfyldes af Ernæringsfluidum, som
igjennem de fine Porer kommunicerer mod de 4
Hoved-længdekanaler. I den bulbøse Del af Stokken er Forholdet
noget anderledes. Her er en fuldstændig Sammenvoxiiing
imellem Skedens ydre og indre Membran, hvorved det
nysnævnte Rum forsvinder; men i det Bindevæv, som udfylder
Rummet, er der en stor Mængde Saftkanaler, forsynede
about 20""" from the bottom, it makes a gentle curve to
the right (fig. 62), and then curves anew, almost direct
downwards (fig. 62, b). terminating thereafter in a
filiform hook (fig. 62, r). Above, in the superior part of
the rachis, the axis becomes round, and passes into the
ventral canal. In this situation, about 6™"’ from the base
of the tormina,1 polyp, it makes a sharp bond upwards
towards the right (fig. 63, a), and then passes close by
the terminal polyp,- and here, curves downwards to the
left J(fig. 63, b). and then terminates in the form of
the letter S, in an extremely small knob (fig. 63. r).
Tin-axis has a brown colour, and is formed of fibrillous
connective-tissue, between whose fibres there is disposed a
large quantity of lime, so that, it becomes very compact,
but vet very flexible, and this Inst feature is specially the
case in the superior half portion. In the bulbous portion,
the axis is, on the contrary, so thick, that in that■situation
, it does not admit of being flexed. After being deprived of
the lime, it’s sectional aspect shows the axis to have a
central nucleus which is nearly cruciform, being formed of
2 arcs whose convex parts are concreted together (fig. (il. a).
The nucleus is somewhat brighter than the surrounding
parts. These are formed of concentric rings, or layers of
connective-tissue fibres, between which, there is an
abundant calcareous deposit (fig. 36, d). The layers are
intersected by radiating connective-tissue fibres, which radiate
divergently, from the centre towards the periphery (fig.
36, e), and they, there, pass over into the membrana propria
of the axis. This is extremely thin and hyaloid, and
consists of fibrillous connective-tissue, and. upon it’s inner
surface, it is strongly concreted with the axis, so that,
they cannot be separated without portions of the axis
adhering. It’s exterior surface is also concreted with the
sheath, but this connection is not so intimate, and is, essentially,
produced by connective-tissue filaments, in such manner,
that there remain spaces, or canals, in which the nutritive
secretions flow (fig. 36, /’).
The sheath consists of two membranes, of which,
the inner one is rather thin, but compact, and by it’s
inner surface, it is concreted to the membrana propria of
the axis (cuticula), as previously stated; whilst, the exterior
surface is smooth, with extremely minute apertures, and it
faces towards the internal cavity of the sheath (fig. 36, ff).
The exterior membrane is very thick, compact, and quite
peculiar (fig. 36, i). Entirely, from the rachis, to the
commencement of the bulbous part, the exterior membrane
is quite free on it’s inner surface; this is smooth, and
penetrated by minute openings, and has, also, a triangular
prominence on all the 4 sides, which corresponds to
the angle of the axis furrow, and nearly fills it out (fig.
61, b). Between the outer surface of the inner
membrane, and the outer membrane’s inner surface, there is.
thus, a space round the entire axis (fig. (il, d). which is
occupied by the nutrient fluid that circulates through the
minute pores into the 4 principal longitudinal canals. In the
bulbous part of the stalk, the case is somewhat different.
Here, there is a complete fusion between the outer and
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