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1A receptacle, sheath, or cell enclosing an organ, part, or structure, in particular.
The loose sheath enclosing the spinal cord.
- ‘The vertebral foramen houses the theca and spinal nerves.’
- ‘The theca contains the cauda equina or nerve roots.’
A cup-like or tubular structure containing a coral polyp.
- ‘In the ‘echinoderm’ reconstruction, the theca lies with the convex side upwards and the appendage is interpreted as an anterior feeding arm.’
- ‘Despite its good preservation, this single specimen did not show all aspects of the theca.’
- ‘Calices and thecae are commonly intact, but typically lack feeding appendages.’
- ‘It is notable that both specimens also display asymmetry in the overall structure of their thecae.’
- ‘The theca around the column is smooth, sometimes with weak longitudinal muscles.’
Either of the lobes of an anther, each containing two pollen sacs.
- ‘Stamens are didynamous, but the yellow anthers occur close together, with their divergent thecae spreading to the outside.’
- ‘At this stage, at least one theca is already opened, and pollinators are attracted to the flowers.’
- ‘The percentage of thecae that dehisced longitudinally varied greatly among rice varieties.’
- ‘Each sequence of thecae forms a stipe, or branch, and colonies varied in the numbers of stipes that they possessed.’
- ‘As pollinators removed pollen from the thecae, their walls collapsed and the anthers curled down gradually.’
The outer layer of cells of a Graafian follicle.
- ‘The term ‘follicle complex’ has been proposed to include the follicle, basement membrane, and the theca, including its blood vessels.’
- ‘The follicle is surrounded by a theca, derived from the stromal compartment of the ovary and is always separated from this compartment, throughout development and final oocyte maturation, by a basement membrane.’
Early 17th century: via Latin from Greek thēkē case.
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