| 单词 |
mesohyl |
| 释义 |
mesohyl, n. Zool.
Brit. |ˈmɛsə(ʊ)hʌɪl|, U.S. |ˈmɛzəˌhaɪl|[see also meso- comb. form.]
[‹ meso- comb. form + ancient Greek ὕλη wood, timber, material (see hyle n.).]
1. In the terminology of J. Hadzi: the primitive or undifferentiated mesoderm of some lower metazoans, esp. the mesogloea of cnidarians. rare.
1953J. Hadzi in Systematic Zool. 2 146/2 Generally speaking, the middle layer or mesoderm underwent a very considerable reduction. I prefer to call this layer the mesohyl.
2. The gelatinous, largely acellular, inner tissue of sponges lying between the outer layer of cells (the pinacoderm) and the layer of cells lining the internal cavities (the choanoderm).
1970C. Lévi in W. G. Fry Biol. Porifera 353 Choanocytes and pinacocytes form, respectively, a choanoderm and a pinacoderm... The latter controls the interrelations between the mesohyl and the external medium. 1986Proc. Royal Soc. (B.) 226445 In many areas of injury, exposed choanosome is sealed by infiltrating mesohyl cells. 1998L. Margulis & K. V. Schwartz Five Kingdoms (ed. 3) iii. 214/1 Sponges are made of two cell layers; between the layers lies an acellular, gel layer called the mesohyl, which contains ameboid cells (amebocytes) and support spicules (skeletal needles) or spongin fibers. |
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