Figure 2c. Coronal T1-weighted MR images obtained at the level of (from rostral to caudal) the optic chiasm (a), median eminence (b), and mamillary bodies (c) show the various hypothalamic structures. The major hypothalamic tracts and nuclei (circled) are arranged symmetrically about the floor and lower medial surface of the third ventricle and include the arcuate nucleus (A), anterior commissure (AC), dorsomedial nucleus (DM), lateral nucleus (L), lateral preoptic nucleus (LPO), mamillary bodies (MB), medial preoptic nucleus (MPO), posterior nucleus (P), paraventricular nucleus (PV), suprachiasmatic nucleus (SC), supraoptic nucleus (SO), and ventromedial nucleus (VM). The arcuate nucleus is located at the base of the infundibulum. F = fornix, ME = median eminence, MT = mamillothalamic tract, OC = optic chiasm, OT = optic tract.