SPONGIOBLAST 



1362 



SPORE 



Spongioblast (spun' ' -je-o-blast) [o-rcoyyoc, a sponge ; 

 jUaardq, a germ]. In biology, a variety of cell 

 derived from the invaginated ectoderm forming the 



Portion of Wall of Neural Tube, 



Exhibiting germ-cells (g) among the differentiating spongio- 

 blasts. (From Piersol, after His.) 



neural tube. The spongioblasts are especially con- 

 cerned in the production of the neuroglia-cells. Cf. 

 Neuroblasts. 



Spongiole (spun' -je-ol) [spongioid, a little sponge]. In 

 biology, a name formerly applied to the spongy tissue 

 of the root-tip, on account of its supposed property of 

 sucking up moisture like a sponge. 



Spongiolin (spun'-je-o-lin). See Spongin. 



Spongiopiline (spun' '-je-o-pi' '-lin) [anoyyiov, dim. of 

 oxoyyoq, sponge; tcTKoc, felt]. Felted or woven 

 cloth, into which tufts of sponge are incorporated ; one 

 side is coated with rubber ; it is a good substitute for 

 a cataplasm. 



Spongioplasm (spun' '- je - o - plasm) [air6yyo<;, sponge; 

 TzXaojia, anything formed or molded]. In biology, 

 the extremely fine, elastic, protoplasmic threads form- 

 ing the intracellular reticulum, and containing between 

 them the clear, homogeneous, active hyaloplasm, q. v. 

 ' ' In muscle-fibers the spongioplasm is regularly 

 arranged, consisting of parallel filaments which run 

 longitudinally and are bound by transverse filaments 

 at regular intervals in a plane at right angles to the 

 longitudinal axis." (Lang.) 



Spongiosa (spun-je-o 1 '-sdh) [oiroyyoq, sponge]. Cancel- 

 lous tissue. 



Spongiose (spun' -je-oz) [ondyyoc, sponge]. Full of 

 pores, like a sponge. 



Spongoblast (spung' -go-blast) . Same as Spongioblast. 



Spongoid (spun'-goid) [an6yyoc, sponge; e'uhc, resem- 

 bling]. Resembling sponge. 



Spongomere (spung' -go-mir) [anSyyoq, a sponge ; fiepoc, 

 a part]. In biology, the upper portion of a sponge, 

 characterized by the presence of chambers lined with 

 collar-cells. Cf. Hypomere. 



Spongos, Spongus (spun'-gos, spun'-gus). See Sponge. 



Spongy (spun'-je) [oirdyyoc, sponge]. Having the 

 texture of sponge; very porous. S. Bones, bones 

 having a porous, reticulated structure, especially the 

 turbinated bones of the nose, and the sphenoid and 

 ethmoid bones. S. Portion of the Urethra. See 

 Urethra. 



Spontaneity (spon-tan-e'-it-e) [spons, will, abl. sponte, 

 of one's own accord]. In biology, variation in struc- 

 ture or function attributable to some innate or heredi- 

 tary condition of the organism and not to its environ- 

 ment; purposeless, or uncalled-for activity. 



Spontaneous (spon-la'-ne-us) [spons, will]. Voluntary, 

 or without extraneous impulse ; instinctive ; automatic. 



S. Ankle-clonus, a rhythmic movement of the leg 

 and foot, corresponding to ankle-clonus, but occurring 

 spontaneously. S. Combustion. See Combustion. 

 S. Cretinism. See Cretinism. S. Evolution. 

 See Evolution. S. Generation. See Abio- 

 genesis. S. Version. See Version. 

 Spool-worm. Synonym of Oxyuris vermicu- 

 laris. See under Parasites (Animal), 7 able of. 

 Spoon [ME., spoon, spoon]. A utensil consist- 

 ing of an oval or circular bowl and a handle ; 

 a spoon-shaped instrument ; a curet. S.-saw, 

 a spoon-shaped instrument or curet with ser- 

 rated edges, used for scraping away fungous 

 growths. S.-nail, a condition of the nail in 

 which it is thinned and concave from side to 

 side, with the edges everted, and with hollow- 

 ing to a less degree antero-posteriorly. It has 

 been observed in some wasting diseases. 

 Spora (spo'-rah) [L.]. See Spore. 

 Sporaceous (spor-a'-shus) [spora, spore]. Con- 

 sisting of or convertible into spores. 

 Sporadic (spor-ad'-ik) [o-opadiKor, scattered]. 

 Scattered. Applied to diseases, or cases of 

 disease, that may spread, but which are not epi- 

 demic. S. Cholera, a synonym of Cholera morbus. 

 Sporadicity (spor - ad - is' - it - e) [airopadiKoq, scattered]. 



The quality of being sporadic. 

 Sporangidium (spor-an- jid'- e -um) [aizopoq, spore]. 



The theca or capsule of mosses. 

 Sporangiferous (spor- an-jif'-er-us) [cTr6poc, spore ; 



ferre, to bear]. Bearing sporangia. 

 Sporangiform (spor-an' -jiform) [anopoq , spore ; forma \ 



form]. Having the form of a sporangium. 

 Sporangioid (spor - an'- je- old) [anopoq, spore ; 



like] . Sporangiform. 

 Sporangiole (spor - an' - je - ol) [arropoq, spore; <r 

 vessel]. A capsule containing spores. Same a 

 rangium. 

 Sporangiophore (spor- an'-je - o -for). See Spora 



phorum. 

 Sporangiophorum (spor-an-je-off -or-tim) [a~6poc. 

 ayyeiov, vessel ; <f>£peiv, to bear: pi., Sporangiop' 

 In biology, the stalk or receptacle of a sporan, 

 including the leaf-like organ which bears the s] >< 

 Equisetacea: , and the axis of the sporangia of certaii 

 ferns. 

 Sporangiospore (spor-an' -jeo-spor) [<yx6poq, seed 

 yelov, vessel ; oiropoq, seed]. In biology, one ol th 

 spores of a slime-mold (Myxomycetes). 

 Sporangium (spor-an' -je-um) [arropoq, seed ; <; 

 vessel: //. , Sporangia'] . In biology, a capsuli 

 ducing or enclosing spores. Cf. Macrosporan 

 Microsporangiuvi , Oosporangium , Zo'osporang turn. 

 Sporation (spor- a' -shun) [oiropoq, seed]. See Sf 



lion. 

 Spore (spor) [o-rropd, seed, produce, offspring]. I. 1 

 biology, one of the free, motile or non-motile i 

 ductive bodies of a cryptogam, which arise by ordinal 

 processes of vegetation and not directly by a union i 

 sexual elements. In some cases its first stage i 

 of a naked primordial mass of protoplasm (zoos 

 rarely it is multicellular, composed of merisfores < ( 

 breaking up into sporids (polyspore). 2. In animal 

 any germ or reproductive element less organized than 

 true cell ; also, any spermatic or ovulary cell ; 

 the germ of a disease. Cf. , Accidiospore, And: 

 Ascospore, Auxospore, Basidiospore, Bispore, • 

 spore, Chlantydospore, Clinospore, Maerospore, Met, 

 spore, Merispore, Microspore , Oospore, Polyspore, . 

 spore, Pseudospore, Pycnidiospore, Resting-spot\ 

 Sporid, Stylospore, Swarmspore, Teleutospore, 

 spore, Uredospore, Zo'dspore, Zygospore. S.-capsul ( 



