Subthalamus

The subthalamus, or prethalamus (formerly described as ventral thalamus), is part of the diencephalon.

During development the subthalamus is continuous with the hypothalamus, but is separated by white matter fibres mainly from the internal capsule. Caudally, the subthalamus or prethalamus is separated from the thalamus by the zona limitans intrathalamica. Other nuclei of the subthalamus are the zona incerta, thalamic reticular nucleus, and the fields of Forel.

Post-natally the subthalamus lies beneath the thalamus, hence 'sub' (meaning below) 'thalamus'. It also lies dorsolateral to the hypothalamus.

The subthalamus develops efferent (output) connections to the striatum (caudate nucleus and putamen) in the telencephalon, to the dorsal thalamus (medial and lateral nuclear groups) in the diencephalon, and to the red nucleus and substantia nigra in the mesencephalon. It receives afferent (input) connections from the substantia nigra and striatum.

[edit] See also

v • d • e Brain: diencephalon
Epithalamus	Pineal body, Habenula, Habenular nuclei
Hypothalamus	anterior: Anterior hypothalamic nucleus, Paraventricular nucleus, Preoptic area, Supraoptic nucleus, Suprachiasmatic nucleus intermediate/middle/tuberal/pituitary: infundibulum, median eminence, arcuate nucleus, Ventromedial nucleus, Dorsomedial hypothalamic nucleus, Tuber cinereum, Pituitary gland (Anterior pituitary, Posterior pituitary) posterior/lateral: posterior nucleus, Mammillary body, Lateral nucleus
Subthalamus	Subthalamic nucleus, Zona incerta
Thalamus	Pulvinar, Metathalamus (Medial geniculate nucleus, Lateral geniculate nucleus), list of thalamic nuclei
Other	Third ventricle, Interventricular foramina, Optic chiasm, Subfornical organ