id: UBERON:0001906
name: subthalamic nucleus
def: "Lens shaped nucleus lying in the subthalamus" [NIF_GrossAnatomy:nlx_anat_1010002]
def: "The subthalamic nucleus is the lens-shaped nucleus located in the ventral part of the subthalamus on the inner aspect of the internal capsule that is concerned with the integration of somatic motor function[GO]." [GO:0021763]

id: UBERON:0004922
name: postnatal subventricular zone
def: "A mitotically active layer of cells surrounding the brain ventricles in the adult that consists of migrating neuroblasts, astrocytes and transitory amplifying progenitor cells[MP]." [MP:0004275]
def: "The subventricular zone (SVZ) is one of two sources of adult-born neurons in the mammalian brain, the other being the subgranular zone (SGZ) of the hippocampus. In most adult mammals, the SVZ is a three-layered sheath that lies along the lateral wall of the lateral ventricle and consists of type A, B, and C cells. Type A rest along the ventricle wall and are neuronal precursor cells, Type B are adjacent astrocytes, and Type C are immature precursors to the Type A neuroblasts. The neuronal precursor cells travel along the rostral migratory stream ensheathed in a tube of Type B astrocytes, until they reach the olfactory bulb. There they integrate into the existing cellular network and mature into local interneurons. While the majority become adult-born granule cells, a subset become periglomerular cells. Interestingly, the human SVZ differs from other mammals' in several ways. It consists of four layers rather than three: ependymal cells (layer I), a hypo cellular gap (layer II), a ribbon of astrocytes (layer III), and a transitional zone (layer IV). The astrocytes are capable of differentiating into many kinds of tissue including new neurons. However, there is no evidence that the proliferating neurons travel along the rostral migratory stream in a chain to populate the olfactory bulb with new interneurons, as is the case for other mammals." [NIF_GrossAnatomy:nlx_144262]
def: "A paired brain structure situated throughout the lateral walls of the lateral ventricles. It has been associated with having four distinct layers of variable thickness and cell density, as well as cellular composition[WP]." [Wikipedia:Subventricular_zone]

[Term]
id: UBERON:0002360 ! meninx
-def: "Membrane organ that surrounds the brain and the spinal cord." [http://www.shsu.edu/~bio_mlt/Chap15.html,Wikipedia:Meninx,FMA:9589]
+def: "One of three membranous coverings that surrounds the brain and spinal cord" [NIF_GrossAnatomy:nlx_anat_090204]

id: UBERON:0001020
name: white matter commissure
def: "White matter fiber bundle that crosses the midline of the brain or spinal cord[NIF]. In the context of Drosophila refers to a broad band of axons connecting the same neuropils each side of the brain[FBbt]." [NIF_GrossAnatomy:nlx_anat_20090513, UBERON:cjm]

[Term]
id: UBERON:0004086 ! brain ventricle
-def: "one of the system of communicating cavities in the brain that are continuous with the central canal of the spinal cord, that like it are derived from the medullary canal of the embryo, that are lined with an epithelial ependyma, and that contain a serous fluid" []
+def: "Organ cavity of the brain which consists of the lateral ventricles, the third and fourth ventricles and the cerebral aqueduct." [NIF_GrossAnatomy:birnlex_1356]