pyramid /pyr·a·mid/ (pir´ah-mid) a pointed or cone-shaped structure or part; often used to indicate the pyramid of the medulla oblongata.
pyramid of cerebellum p. of vermis.
Lalouette's pyramid p. of thyroid.
pyramid of light see under cone.
pyramid of medulla oblongata either of two rounded masses, one on either side of the median fissure of the medulla oblongata. 
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Pyramids of medulla oblongata in an anterior (inferior) view of the brain stem.
renal pyramids the conical masses composing the medullary substance of the kidney.
pyramid of thyroid an occasional third lobe of the thyroid gland, extending upward from the isthmus.
pyramid of tympanum the hollow elevation in the inner wall of the middle ear containing the stapedius muscle.
pyramid of vermis the part of the vermis cerebelli between the tuber vermis and the uvula.
| pyramid of medulla oblongata n. An elongated white prominence on the ventral surface of the medulla oblongata on either side along the anterior median fissure, corresponding to the pyramidal tract. Also called anterior pyramid. |
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