primary fissure
noun
: a fissure of the cerebellum that is situated between the culmen and declive and that marks the boundary between the anterior lobe and the posterior lobe
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“Primary fissure.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/primary%20fissure. Accessed 4 Nov. 2025.
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