Summary
The fiber projection from the lateral reticular nucleus (LRN) to the cerebellum was examined in the cat. Electrolytic lesions were placed in a confined area of the LRN using a parapharyngeal approach, and the ensuing degeneration was studied in sections stained by the Nauta and the Fink-Heimer methods.
Fibers from the LRN ascend the ipsilateral restiform body, terminating bilaterally but chiefly in the ipsilateral cerebellum. In the ipsilateral cortex projections were found to lobules I to V, with denser terminations in sublobules IVb to Ve. The projections are stronger in the intermediate-lateral zones than in the vermis proper. There is also a dense projection to sublobules VId and VIf and to the medialmost part of the simple lobule (HVI). Scanty termination was seen in the medialmost part of crus I. There is a moderate projection to the caudalmost folium of sublobule VIIb and to the rostral folia of sublobule VIIIa and the paramedian lobule. The contralateral projection by fibers crossed within the cerebellum is far less dense but clearcut in the anterior lobe, the rostral folia of lobule VI and the medial part of the simple lobule.
In the ipsilateral nuclei strong projections were found to rostral portions of the medial nucleus (M) and the caudal two thirds of the anterior interpositus nucleus (IA) with predominance in the lateral part of the latter. A focal projection was found to rostrodorsal portions of the posterior interpositus nucleus (IP). No projection was found to the lateral nucleus (L). Contralaterally there is a weak projection to the rostral part of M and the medial parts of IA and IP.
Similar content being viewed by others
Abbreviations
- AL:
-
Anterior lobe
- BP:
-
Brachium pontis
- CD:
-
Subnucl. dorsalis of the nucl. medullae oblongatae centr.
- CV:
-
Subnucl. ventralis of the nucl. medullae oblongatae centr.
- Cr. I:
-
Crus I
- Cr. II:
-
Crus II
- F:
-
Flocculus
- GL:
-
Granular layer
- IA:
-
Anterior interpositus nucleus
- IO:
-
Inferior olive
- IP:
-
Posterior interpositus nucleus
- LRN:
-
Lateral reticular nucleus
- L:
-
Lateral nucleus
- M:
-
Medial nucleus
- ML:
-
Molecular layer
- Pfd:
-
Paraflocculus dorsalis
- Pfv:
-
Paraflocculus ventralis
- Pm:
-
Paramedian lobule
- RB:
-
Restiform body
- SL:
-
Simple lobule
- SMP:
-
Subnucleus medialis parvocellularis
- ST:
-
Nucleus of the spinal trigeminal tract
- XII:
-
Hypoglossal nerve nucleus
References
Brodal, A.: The cerebellar connections of the nucleus reticularis lateralis (nucleus funiculi lateralis) in rabbit and cat. Experimental investigations. Acta psychiat. scand. 18, 171–233 (1943)
Brodal, A., Courville, J.: Cerebellar corticonuclear projection in the cat. Crus II. An experimental study with silver methods. Brain Res. 50, 1–23 (1973)
Brodal, A., Høivik, B.: Site and mode of termination of primary vestibulocerebellar fibres in the cat. An experimental study with silver impregnation methods. Arch. ital. Biol. 102, 1–21 (1964)
Brodal, P.: Demonstration of a somatotopically organized projection onto the paramedian lobule and the anterior lobe from the lateral reticular nucleus: an experimental study with the horseradish peroxidase method. Brain Res. 95, 221–239 (1975)
Brodal, P., Maršala, J., Brodal, A.: The cerebral cortical projection to the lateral reticular nucleus in the cat, with special reference to the sensorimotor cortical areas. Brain Res. 6, 252–274 (1967)
Chan-Palay, V.: Afferent axons and their relations with neurons in the nucleus lateralis of the cerebellum: A light microscopic study. Z. Anat. Entwickl.-Gesch. 142, 1–21 (1973)
Clendenin, M., Ekerot, C.-F., Oscarsson, O., Rosén, I.: The lateral reticular nucleus in the cat. I. Mossy fibre distribution in cerebellar cortex. Exp. Brain Res. 21, 473–486 (1974a)
Clendenin, M., Ekerot, C.-F., Oscarsson, O., Rosén, I.: The lateral reticular nucleus in the cat. II. Organization of component activated from bilateral ventral flexor reflex tract (bVFRT). Exp. Brain Res. 21, 487–500 (1974b)
Courville, J.: Rubrobulbar fibres to the facial nucleus and the lateral reticular nucleus (nucleus of the lateral funiculus). An experimental study in the cat with silver impregnation methods. Brain Res. 1, 317–337 (1966)
Courville, J., Brodal, A.: Rubro-cerebellar connections in the cat: An experimental study with silver impregnation methods. J. comp. Neurol. 126, 471–486 (1966)
Eccles, J.C., Ito, M., Szentágothai, J.: The Cerebellum as a Neuronal Machine. 335 p. Berlin-Heidelberg-New York: Springer 1967
Eccles, J.C., Rantucci, T., Sabah, N.H., Táboříková, H.: Somatotopic studies on cerebellar fastigial cells. Exp. Brain Res. 19, 100–118 (1974a)
Eccles, J.C., Rosén, I., Scheid, P., Táboříková, H.: Temporal patterns of responses of interpositus neurons to peripheral afferent stimulation. J. Neurophysiol. 37, 1424–1437 (1974b)
Eccles, J.C., Sabah, N.H., Táboříková, H.: The pathways responsible for excitation and inhibition of fastigial neurones. Exp. Brain Res. 19, 78–99 (1974c)
Edwards, S.B.: The ascending and descending projections of the red nucleus in the cat: an experimental study using an autoradiographic tracing methods. Brain Res. 48, 45–63 (1972)
Fink, R.P., Heimer, L.: Two methods for selective silver impregnation of degenerating axons and their synaptic endings in the central nervous system. Brain Res. 4, 369–374 (1967)
Flood, S., Jansen, J.: On the cerebellar nuclei in the cat. Acta anat. (Basel) 46, 52–72 (1961)
Grant, G.: Spinal course and somatotopically localized termination of the spinocerebellar tracts. An experimental study in the cat. Acta physiol. scand. 56, Suppl. 193, 1–45 (1962)
Ikeda, M., Matsushita, M.: Electron microscopic observations on the spinal projections to the cerebellar nuclei in the cat and rabbit. Experientia (Basel) 29, 1280–1282 (1973)
Ikeda, M., Matsushita, M.: Electron microscopic observations on the olivary projections to the cerebellar nuclei in the cat. Experientia (Basel) 30, 536–538 (1974)
Ito, M., Yoshida, M., Obata, K.: Monosynaptic inhibition of the intracerebellar nuclei induced from the cerebellar cortex. Experientia (Basel) 20, 575–576 (1964)
Ito, M., Yoshida, M., Obata, K., Kawai, N., Udo, M.: Inhibitory control of intracerebellar nuclei by the Purkinje cell axons. Exp. Brain Res. 10, 64–80 (1970)
Kawamura, K., Brodal, A., Hoddevik, G.: The projection of the superior colliculus onto the reticular formation of the brain stem. An experimental anatomical study in the cat. Exp. Brain Res. 19, 1–19 (1974)
Künzle, H.: The topographic organization of spinal afferents to the lateral reticular nucleus of the cat. J. comp. Neurol. 149, 103–116 (1973)
Künzle, H.: Autoradiographic tracing of the cerebellar projections from the lateral reticular nucleus in the cat. Exp. Brain Res. 22, 255–266 (1975)
Künzle, H., Wiesendanger, M.: Pyramidal connections to the lateral reticular nucleus in the cat: a degeneration study. Acta anat. (Basel) 88, 105–114 (1974)
Ladpli, R., Brodal, A.: Experimental studies of commissural and reticular formation projections from the vestibular nuclei in the cat. Brain Res. 8, 65–96 (1968)
Larsell, O.: The cerebellum of the cat and the monkey. J. comp. Neurol. 99, 135–199 (1953)
Larsell, O.: The Comparative Anatomy and Histology of the Cerebellum from Monotremes through Apes. 269 pp. Minneapolis: Univ. Minnesota Press 1970
Matsushita, M., Ikeda, M.: Olivary projections to the cerebellar nuclei in the cat. Exp. Brain Res. 10, 488–500 (1970a)
Matsushita, M., Ikeda, M.: Spinal projections to the cerebellar nuclei in the cat. Exp. Brain Res. 10, 501–511 (1970b)
Matsushita, M., Iwahori, N.: Structural organization of the interpositus and the dentate nuclei. Brain Res. 35, 17–36 (1971)
Matsushita, M., Ueyama, T.: Projections from the spinal cord to the cerebellar nuclei in the rabbit and rat. Exp. Neurol. 38, 438–448 (1973)
Mehler, W.R.: Some neurological species differences — A posteriori. Ann. N.Y. Acad. Sci. 146, 428–468 (1969)
Nauta, W.J.H.: Silver impregnation of degenerating axons. In: New Research Techniques of Neuroanatomy, pp. 17–26. (Ed. W. F. Windle). Springfield/Ill.: C. C. Thomas 1957
Oscarsson, O.: Functional organization of the spinocerebellar and cuneocerebellar tracts. Physiol. Rev. 45, 495–522 (1965)
Oscarsson, O.: Functional organization of spinocerebellar paths. In: Handbook of Sensory Physiology. Vol. 2. Somatosensory System, pp. 340–380. (Ed. A. Iggo). Berlin-Heidelberg-New York: Springer 1973
Papez, J.W.: Reticulo-spinal tracts in the cat. Marchi method. J. comp. Neurol. 41, 365–399 (1926)
Van Gebuchten, A.: Le corps restiforme et les connexions bulbo-cérébelleuses. Névraxe 6, 125–154 (1904)
Voogd, J.: The Cerebellum of the Cat. Structure and Fibre Connexions. Assen: Van Gorcum 1964
Walberg, F., Pompeiano, O.: Fastigiofugal fibers to the lateral reticular nucleus; An experimental study in the cat. Exp. Neurol. 2, 40–53 (1960)
Walberg, F., Pompeiano, O., Westrum, L.E., Hauglie-Hanssen, E.: Fastigioreticular fibres in the cat. An experimental study with silver methods. J. comp. Neurol. 119, 187–199 (1962)
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Matsushita, M., Ikeda, M. Projections from the lateral reticular nucleus to the cerebellar cortex and nuclei in the cat. Exp Brain Res 24, 403–421 (1976). https://doi.org/10.1007/BF00235006
Received:
Revised:
Issue Date:
DOI: https://doi.org/10.1007/BF00235006