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.’
- 1.1 The outer layer of cells of a Graafian follicle.
- ‘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.’
- ‘The term ‘follicle complex’ has been proposed to include the follicle, basement membrane, and the theca, including its blood vessels.’
A cup-like or tubular structure containing a coral polyp.
- ‘The theca around the column is smooth, sometimes with weak longitudinal muscles.’
- ‘It is notable that both specimens also display asymmetry in the overall structure of their thecae.’
- ‘Calices and thecae are commonly intact, but typically lack feeding appendages.’
- ‘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.’
Either of the lobes of an anther, each containing two pollen sacs.
bag, pouch, bladder, blisterView synonyms
- ‘Each sequence of thecae forms a stipe, or branch, and colonies varied in the numbers of stipes that they possessed.’
- ‘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.’
- ‘Stamens are didynamous, but the yellow anthers occur close together, with their divergent thecae spreading to the outside.’
- ‘As pollinators removed pollen from the thecae, their walls collapsed and the anthers curled down gradually.’
Early 17th century: via Latin from Greek thēkē ‘case’.
We take a look at several popular, though confusing, punctuation marks.