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theca

n. 囊,膜,鞘

囊,膜,鞘

WordNet (r) 3.0 (2006) (WordNet)

theca
n 1: a case or sheath especially a pollen sac or moss capsule
[synonym: {theca}, {sac}]
2: outer sheath of the pupa of certain insects

The Collaborative International Dictionary of English v.0.48 (gcide)

Theca \The"ca\, n.; pl. {Thecae}. [L., fr. Gr. ? a case to put
anything in. See {Tick} a cover.]
1. A sheath; a case; as, the theca, or cell, of an anther;
the theca, or spore case, of a fungus; the theca of the
spinal cord.
[1913 Webster]

2. (Zool.)
(a) The chitinous cup which protects the hydranths of
certain hydroids.
(b) The more or less cuplike calicle of a coral.
(c) The wall forming a calicle of a coral.
[1913 Webster]

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英文字典中文字典相关资料:

Theca - Wikipedia
In microbiology and planktology, a theca is a subcellular structural component out of which the frustules of diatoms and dinoflagellates are constructed
Where are the theca cells from: the mechanism of theca cells . . .
Focusing on the question of where theca cells originate, this article discusses the origin of theca cells and the factors involved in their recruitment and differentiation, which will help us comprehensively understand the mystery of theca cells’ life cycle
THECA Definition Meaning - Merriam-Webster
The meaning of THECA is an enveloping sheath or case of an animal or animal part
Theca Cell - an overview | ScienceDirect Topics
The inner-most layer that is closest to the granulosa cells is called the theca interna; the outer-most layer is called the theca externa The theca interna contains the endocrine cells that produce the steroid hormones
What Does The Theca Do Female Reproductive System
Theca, derived from Latin meaning 'casing' or 'sheath', refers to the theca cell layer of the ovarian follicle, which is a connective tissue envelope encasing the granulosa cells
Theca | definition of theca by Medical dictionary
theca A casing, outer covering or sheath Collins Dictionary of Medicine © Robert M Youngson 2004, 2005
Theca cells - (Anatomy and Physiology I) - Vocab, Definition . . .
Theca cells are specialized cells surrounding the follicle in the ovary, involved in producing androgens, which are precursors to estrogens They play a crucial role in the development of the oocyte (egg cell) and the production of sex steroids
Thecal sac - Wikipedia
The thecal sac or dural sac is the membranous sheath (theca) or tube of dura mater that surrounds the spinal cord and the cauda equina The thecal sac contains the cerebrospinal fluid which provides nutrients and buoyancy to the spinal cord [1]
The Understanding Theca Cells Function in Ovaries
Within the ovaries, a specialized group of cells known as the theca cells are essential for the development of follicles and the production of hormones that regulate the menstrual cycle
theca cell - Repropedia
Theca cells are somatic cells of the developing follicle that form an enveloping sheath around the granulosa cell layers Activated follicles at the secondary stage of development recruit theca stem cells from the surrounding stroma cells to differentiate

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