Research reveals a notable interplay between fluctuating ovarian hormones during the menstrual cycle and structural adaptations within women's brains, particularly in regions vital for cognitive function. Utilizing a meticulous approach, researchers tapped into 7 Tesla MRI and blood sampling across six menstrual cycle points to observe how estradiol and progesterone influenced medial temporal lobe and hippocampal regions, pivotal areas for episodic memory and spatial cognition.