Neuroanatomy, Hypothalamus
2026 Jan
Abstract
Landmarks defining the regions of the hypothalamus include the lamina terminalis, pituitary gland, mammillary bodies, and superior hypothalamic sulcus (see Figure.  The Hypothalamus-Pituitary-Thyroid Axis). The hypothalamus is a bilateral collection of nuclei divided into 3 zones surrounding the third ventricle and the mammillary bodies. The nuclei in the periventricular zone generally regulate the endocrine system, and the nuclei in the medial and lateral zones regulate autonomic and somatic behavior. The hypothalamus is centrally located in the brain, and it connects to the brainstem via the dorsal longitudinal fasciculus, cerebral cortex via the medial forebrain bundle, hippocampus via the fornix, amygdala via the stria terminalis, thalamus via the mammillothalamic tract, pituitary via median eminence, and retina via the retinohypothalamic tract. The hypothalamus is the gray matter of the ventral portion of the diencephalon. The hypothalamus is the higher center of the autonomic nervous system and is involved in the regulation of various homeostatic mechanisms. It also modulates respiration by facilitating the respiratory network. Among subregions of the hypothalamus, the paraventricular nucleus, lateral hypothalamic area, perifornical area, dorsomedial and posterior hypothalamus play particularly important roles in respiratory control. Neurons in these regions have extensive and complex interconnectivity with the cerebral cortex, pons, medulla, spinal cord, and other brain areas. These hypothalamic regions are involved in the maintenance of basal ventilation, respiratory responses to hypoxic and hypercapnic conditions, respiratory augmentation during dynamic exercise, and respiratory modulation in awake and sleep states. Disorders affecting the hypothalamus such as narcolepsy, ROHHAD syndrome, and Prader-Willi syndrome could lead to respiratory abnormalities. However, the role of the hypothalamus in respiratory control, especially its interplay with other local respiratory networks has not yet been fully elucidated. Further clarification of these issues would contribute to a better understanding of the hypothalamus-mediated respiratory control and the pathophysiology of respiratory disorders underlain by hypothalamic dysfunction, as well as to the development of new targeted therapies.
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