Brain: Diencephalon Diagram depicting the main subdivisions of the embryonic vertebrate brain. These regions will later differentiate into forebrain, midbrain and hindbrain structures. Reconstruction of peripheral nerves of a human embryo of 10.2 mm. (Label for Diencephalon is at left.) Latin diencephalon Gray's subject #189 807 NeuroNames hier-271 MeSH Diencephalon Code TH H3.11.03.5.00001 NeuroLex ID birnlex_1503
The diencephalon ("interbrain") is the region of the brain that includes the thalamus, metathalamus, hypothalamus, epithalamus, prethalamus or subthalamus and pretectum. In development, the diencephalon and the telencephalon both derive from the prosencephalon (forebrain). The diencephalon is located near the midline of the brain, above the mesencephalon (midbrain).
The diencephalon is the part of the forebrain that contains such important structures as the thalamus, hypothalamus, posterior portion of the pituitary gland, and pineal gland. The hypothalamus performs numerous vital functions, most of which relate directly or indirectly to the regulation of visceral activities by way of other brain regions and the autonomic nervous system.
Nervous system (TA A14, GA 9) Central nervous system Peripheral nervous system Human brain: diencephalon (TA A14.1.08, GA 9.807) EpithalamusSurface ThalamusSurface
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 tractMedullary laminae
HypothalamusSurfaceAutonomic zonesAnterior (parasympathetic/heat loss) · Posterior (sympathetic/heat conservation) Subthalamus Ventricular system:
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