zygantrum

anatomy

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Last updated

July 16, 2026

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The term "zygantrum" refers to a fossa, or depression, located on the posterior median part of a vertebra's neural arch. This anatomical feature is found in certain animals, such as snakes, and serves to accommodate the zygosphene of the vertebra above it. The zygosphene is a bony projection that fits into the zygantrum, creating a more stable articulation between vertebrae. This specialized structure contributes to the flexibility and support of the vertebral column in animals like snakes, which require significant spinal mobility.12

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snake
Vertebrae
…of the vertebra and the zygantrum being a pocket into which the zygosphene fits and within which it can swivel. These five points permit lateral and vertical rotation while preventing almost entirely any twisting of the vertebral column, thus achieving both flexibility and rigidity. The vertebra may bear on its…
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…of the vertebra and the zygantrum being a pocket into which the zygosphene fits and within which it can swivel. These five points permit lateral and vertical rotation while preventing almost entirely any twisting of the vertebral column, thus achieving both flexibility and rigidity. The vertebra may bear on its…
Read More