The calcar avis, (calcarine spur) previously known as the hippocampus minor, [1] is an involution of the wall of the lateral ventricle's posterior horn produced by the calcarine fissure. [2] It is sometimes visible on ultrasound [3] and can resemble a clot. [4]

Jan 12, 2023 · Calcar avis is an elevation of white matter projecting from the medial wall of the occipital horn of the lateral ventricle. It is variably conspicuous, depending on how deep the calcarine sulcus is.

Aug 8, 2023 · The roof and lateral wall are formed by the tapetum, while the medial wall shows two elevations, one superior and the other inferior and referred to as the calcar avis. Superior to those elevations is a structure called the bulb of the posterior horn.

Sep 30, 2019 · The Calcar avis is a mound of white matter formed by the development of the calcarine fissure. This fissure begins to develop at 16 weeks of gestation and extends progressively deeply from the medial aspect of the occipital lobe towards the occipital horn of the lateral ventricles.

The calcar avis indents the medial wall of the occipital horn of the lateral ventricle and, when prominent, may be seen on an ultrasonogram (especially one obtained through the posterior fontanel). It should be recognized as a normal variant and not be mistaken for an abnormal mass or resolving blood clot.

Mar 15, 2025 · The meaning of CALCAR AVIS is a curved ridge on the medial wall of the posterior horn of each lateral ventricle of the brain opposite the calcarine sulcus.

We performed a comprehensive review of relevant neuroanatomic literature, bibliographic sources, and 19th century primary sources. Once known as the hippocampus minor, the structure now known as the calcar avis is an involution of the ventricular wall produced by …

calcar a´vis an eminence on the medial wall of the occipital horn of the lateral ventricle, below the bulb of the occipital horn, produced by lateral extension of the calcarine sulcus. Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc.

Calcar avis…rara avis: A Flash Through Its History and Terminology Anat Sci Educ. 2020 Jan;13(1):122-123. doi: 10.1002/ase.1893. Epub 2019 Jun 13. Author Jorge M Barcia 1 Affiliation 1 Department of Morphology, Structure and ...

Also known as: calcar avis, Calcar avis NeuroNames ID: 210. Size Differences by Sex, Age and Diagnosis: Species Having or Lacking this Structure: All Names & Sources. Internal Structure. Cells Found There. Genes Expressed There. Locus in Brain Hierarchy. Connections. Models Where It Appears.