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The habenular nuclei comprise a small group of nuclei that are part of the diencephalon, situated at the posterior end of the thalamus, on its upper surface. The pineal gland is attached to the brain in this region.

Nerve impulses from the habenular nuclei are transmitted to the septal nuclei via the stria medullaris, which is found on the medial surface of the thalamus.

v·d·e Human brain: diencephalon (TA A14.1.08, GA 9.807)
Epithalamus	Surface Pineal body · Habenula · Habenular trigone · Habenular commissure Grey matter Pretectal area · Habenular nuclei · Subcommissural organ
Thalamus	Surface Stria medullaris of thalamus · Thalamic reticular nucleus · Taenia thalami Grey matter/ nuclei paired: AN · Ventral (VA/VL, VP/VPM/VPL) · Lateral (LD, LP, Pulvinar) · Metathalamus (MG, LG) midline: MD · Intralaminar (Centromedian) · Midline nuclear group · Interthalamic adhesion White matter Mammillothalamic fasciculus · Pallidothalamic tracts (Ansa lenticularis, Lenticular fasciculus, Thalamic fasciculus) · PCML (Medial lemniscus, Trigeminal lemniscus) · Spinothalamic tract · Lateral lemniscus · Dentatothalamic tract · Acoustic radiation · Optic radiation · Subthalamic fasciculus · Anterior trigeminothalamic tract Medullary laminae
Hypothalamus	Surface Median eminence/Tuber cinereum · Mammillary body · Infundibulum Grey matter Autonomic zones Anterior (parasympathetic/heat loss) · Posterior (sympathetic/heat conservation) Endocrine posterior pituitary: magnocellular/Paraventricular/Supraoptic (oxytocin/vasopressin) other: parvocellular/Arcuate (dopamine/GHRH) · Preoptic (GnRH) · Suprachiasmatic (melatonin) Emotion Lateral (hunger) · Ventromedial (satiety) · Dorsomedial (rage) White matter afferent (SN → Medial forebrain bundle) · efferent (Mammillothalamic fasciculus → AN, Stria terminalis → Amygdala, Dorsal longitudinal fasciculus → SC) Pituitary Posterior is diencephalon, but anterior is glandular
Subthalamus	Subthalamic nucleus · Zona incerta
Ventricular system: Third ventricle	recesses: (Optic recess, Infundibular recess, Suprapineal recess, Pineal recess) Hypothalamic sulcus · Tela chorioidea of third ventricle Subfornical organ Apertures: Interventricular/Monro Posterior commissure

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