Dentate nucleus

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Dentate nucleus

The nucleus dentatus (dt. Toothed nucleus or tooth core ), also nucleus lateralis cerebelli , is the largest nucleus in the cerebellum .

anatomy

The dentate nucleus consists of a jagged band of gray matter and lies in the two cerebellar hemispheres, the so-called pontocerebellum . It is functionally closely linked to the cerebellar cortex. It is the furthest lateral of all the cerebellar nuclei, is easily recognizable with the naked eye, and has a bag-shaped opening called the hilum nuclei dentati . In humans, the diameter of the core is about 1.6 to 2.6 cm, its wall thickness between 0.3 and 0.6 mm. Inside the core structure is white matter , which represents the efferent nerve fibers of the core emerging from the hilum . The afferent fibers approach the convex, outer side of the core, which is shown in the sectional view as a U-shaped folded band . Medial to it, the emboliform nucleus can be found in each cerebellar hemisphere .

Projections

The dentate nucleus projects onto the parvocellular part of the contralateral ruber nucleus , onto the thalamus and onto the oculomotor nerve nucleus . The nerve fiber bundle that ends in the ruber nucleus is also known as the dentatorubral fasciculus , runs in the superior cerebellar peduncle and forms part of the cerebellorubral tract . From the parvocellular part of the ruber nucleus, rubroolivary fibers run over the central canopy to the inferior olivar nucleus .

Furthermore, motor projections from the pontocerebellum in the dentate nucleus are switched and then, also via the superior cerebellar peduncles , are conducted as the dentatothalamic tract to the dorsal parts of the anterior anterior and ventrolateral thalamus, which are connected to the motor cortex . The tractus dentatothalamicus forms the main component of the tractus cerebellothalamicus , which also crosses to the contralateral side after entering the tegmentum mesencephali .

Web links

Wikibooks: Topographic Anatomy: Neuroanatomy: Cerebellum  - Learning and Teaching Materials

swell

  1. ↑ Trepel, Martin: Neuroanatomie. Structure and function, 3rd edition, Munich / Jena 2004, p. 152. ISBN 3-437-41297-3
  2. ↑ Kugler, Peter: nervous system. Kleinhirn, in: Drenckhahn, Detlev (ed.): Benninghoff. Anatomy. Macroscopic anatomy, histology, embryology, cell biology, vol. 2, 16th edition, Munich 2004, p. 392ff. ISBN 3-437-42350-9
  3. ↑ a b Kugler, Peter: Nervensystem. Kleinhirn, in: Drenckhahn, Detlev (ed.): Benninghoff. Anatomy. Macroscopic anatomy, histology, embryology, cell biology, Vol. 2, 16th edition, Munich 2004, p. 416. ISBN 3-437-42350-9
  4. ^ Kahle, Werner / Frotscher, Michael: Pocket Atlas Anatomie. Vol. 3: Nervensystem und Sinnesorgane, 9, Aufl., Stuttgart 2005, p. 136. ISBN 3-13-492209-6
  5. ↑ a b Trepel, Martin: Neuroanatomie. Structure and function, 3rd edition, Munich / Jena 2004, p. 160. ISBN 3-437-41297-3
  6. ^ Bechmann, Ingo / Nitsch, Robert: Central nervous system, Systema nervosum centrale, brain, encephalon and spinal cord, medulla spinalis, in: Jürgen Fanghänel et al. (Ed.): Waldeyer . Human Anatomy, 17th edition, Berlin / New York 2003, p. 513f. ISBN 3-11-016561-9