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In botany, the theca is related to plant's flower anatomy. The theca of an angiosperm consists of a pair of microsporangia that are adjacent to each other and share a common area of dehiscence called the stomium. [1] Any part of a microsporophyll that bears microsporangia is called an anther. Most anthers are formed on the apex of a filament.
Encephalartos villosus microsporophylls with microsporangia. A microsporangium (pl. microsporangia) is a sporangium that produces microspores that give rise to male gametophytes when they germinate. Microsporangia occur in all vascular plants that have heterosporic life cycles, such as seed plants, spike mosses and the aquatic fern genus Azolla.
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 route of administration is sometimes simply referred to as "intrathecal"; however, the term is also an adjective that refers to something occurring in or introduced into the anatomic space or potential space inside a sheath, most commonly the arachnoid membrane of the brain or spinal cord [1] (under which is the subarachnoid space).
Intradural procedures, such as removal of a brain tumour or treatment of trigeminal neuralgia via a microvascular decompression, require that an incision is made to the dura mater. To achieve a watertight repair and avoid potential post-operative complications, the dura is typically closed with sutures .
The weight loss drug Zepbound, generically known as tirzepatide, is also now an approved medication to treat obstructive sleep apnea, per a Food and Drug Administration Dec. 20 press release.. The ...
The closure of a marine zoo in the south of France has sparked intense debate over the future of its inhabitants, including two beloved orcas. Marineland Antibes, near Cannes, closed for good on ...
Hyperthecosis, or ovarian hyperthecosis, is hyperplasia of the theca interna of the ovary. [1] Hyperthecosis occurs when an area of luteinization occurs along with stromal hyperplasia. The luteinized cells produce androgens , which may lead to hirsutism and virilization (or masculinization) in affected women.
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