plural calcaria avium
-vē-əm 
: a curved ridge on the medial wall of the posterior horn of each lateral ventricle of the brain opposite the calcarine sulcus
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“Calcar avis.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/calcar%20avis. Accessed 4 Mar. 2025.
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