Identify the structure shown below. (Recent NEET Pattern 2019)

Fornix. ***Fornix*** - The arrow points to a C-shaped bundle of **nerve fibers** in the brain that acts as the primary efferent (output) pathway of the **hippocampus**, a crucial structure for memory. - It is located inferior to the corpus callosum and its position in the image is consistent with the anatomical location of the fornix. *Corpus callosum* - The corpus callosum is a large, **C-shaped nerve fiber bundle** located beneath the cerebral cortex in the longitudinal fissure, connecting the left and right cerebral hemispheres. - While visible in the image, the arrow specifically indicates the structure immediately beneath it, which is the fornix, not the corpus callosum itself. *Pineal gland* - The **pineal gland** is a small endocrine gland located in the epithalamus, near the center of the brain, behind the thalamus. - Its position is medial and inferior to the structure indicated by the arrow. *Splenium* - The **splenium** is the posterior, thicker part of the **corpus callosum**, forming its most caudal end. - The arrow points to a more anterior and inferior structure than the splenium. *Septum pellucidum* - The **septum pellucidum** is a thin, vertical membrane separating the anterior horns of the left and right lateral ventricles. - It is located superior and anterior to the fornix, positioned between the corpus callosum above and the fornix below, which is different from the structure indicated by the arrow. [Practice more Anatomy PYQs on OnCourse]

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NEET-PG 2019 — Anatomy

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