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Nuclei are connected to other nuclei by tracts, the bundles (fascicles) of axons (nerve fibers) extending from the cell bodies. A nucleus is one of the two most common forms of nerve cell organization, the other being layered structures such as the cerebral cortex or cerebellar cortex.
Another area, not on the dorsum of the brainstem, is where the special visceral efferents nuclei reside. These formed from the pharyngeal arches , in the embryo. This area is a bit below the autonomic motor nuclei , and includes the nucleus ambiguus , facial nerve nucleus, as well as the motor part of the trigeminal nerve nucleus.
The names given to the various nuclei of the basal ganglia are different in different species. In cats and rodents the internal globus pallidus is known as the entopeduncular nucleus . [ 63 ] In birds the striatum is called the paleostriatum augmentatum and the external globus pallidus is called the paleostriatum primitivum .
The two main neuronal classes in the cerebral cortex are excitatory projection neurons (around 70-80%) and inhibitory interneurons (around 20–30%). [2] Neurons are often grouped into a cluster known as a nucleus where they usually have roughly similar connections and functions. [3] Nuclei are connected to other nuclei by tracts of white matter.
Pontine nuclei; Pontine cranial nerve nuclei. Chief or pontine nucleus of the trigeminal nerve sensory nucleus (V) Motor nucleus for the trigeminal nerve (V) Abducens nucleus (VI) Facial nerve nucleus (VII) Vestibulocochlear nuclei (vestibular nuclei and cochlear nuclei) (VIII) Superior salivatory nucleus; Pontine tegmentum
Aggregates of grey matter such as the basal ganglia (caudate nucleus, putamen, globus pallidus, substantia nigra, subthalamic nucleus, nucleus accumbens) and brainstem nuclei (red nucleus, cranial nerve nuclei) are spread within the cerebral white matter.
This is an accepted version of this page This is the accepted version, checked on 7 January 2025. There are template/file changes awaiting review. Central organ of the human nervous system "Brain tissue" redirects here. For brains in other animals, see Brain. Human brain The human brain, obtained after an autopsy Human brain and skull Details Precursor Neural tube System Central nervous system ...
Occlusion of blood vessels that supply the nerves or their nuclei, an ischemic stroke, may cause specific signs and symptoms relating to the damaged area. If there is a stroke of the midbrain , pons or medulla , various cranial nerves may be damaged, resulting in dysfunction and symptoms of a number of different syndromes . [ 26 ]