Summary
A survey has been made of the pineal region of the brain of 11 species of marsupials belonging to 5 families and a species from both families of monotremes.
The results show that the pineal body of non-eutherian mammals, although well-defined in all species, has a very varied morphology. Three types of pineal recess occur: (i) a pineal recess in sensu stricto, (ii) an intercommissural pineal recess, and (iii) an infrapineal recess. The existence of nerve fibres which pass through the pineal body and form a spatial link between the habenular and posterior commissures, has been demonstrated in marsupials and monotremes. It is also likely that these animals as well as eutherian mammals possess a nervus conarii. Nerve cells are not a constant feature of the non-eutherian pineal body.
The subcommissural organ (SCO) is present in all species. It does not exhibit the same degree of morphological variation as the pineal body. Horizontal sections available for 4 species within 3 families of marsupials show it to be composed of a median portion joined to bilateral protuberances. Large nerve cells occur within the SCO in all marsupial species; they are absent from the monotreme SCO. Tentatively, the relationship of these neurons to the SCO is considered to be merely one of association.
The importance of an extended comparative study of this region in non- eutherian mammals in order to add insight into its phylogeny and function is emphasized.
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References
Bauer-Jokl, M.: Über das sogenannte Subcommissuralorgan. Arb. Neurol. Inst. Wien 22, 41–79 (1917)
Bodian, D.: A new method for staining nerve fibres and nerve endings in mounted paraffin sections. Anat. Rec. 65, 89–97 (1936)
Hofer, H.O., Merker, G., Oksche, A.: Atypische Formen des Pinealorgans der Säugetiere. Verh. Anat. Ges. 70, 97–102 (1976)
Johnson, J.L. jr.: Central nervous system of marsupials. In: The Biology of Marsupials (Hunsaker II, D., ed.), p. 252. New York: Academic Press 1977
Jordan, H.E.: The microscopic anatomy of the epiphysis of the opossum. Anat. Rec. 5, 325–338 (1911)
Kenny, G.C.T.: The innervation of the mammalian pineal body: a comparative study. Proc. Aust. Assoc. Neurol. 3, 133–141 (1965)
Kimble, J.E., Møllgård, K.: Subcommissural organ-associated neurons in fetal and neonatal rabbit. Cell Tissue Res. 159, 195–204 (1975)
Klüver, H., Barrera, E.: A method for the combined staining of cells and fibres in the nervous system. J. Neuropathol. Exp. Neurol. 12, 400–403 (1953)
Krabbe, K.: Bidrag til kundskaben om corpus pineale hos pattedyrene. Kung. Danske Vidensk. Selsk. biol. medd. 2 (2), 1–111 (1919)
Krabbe, K.: Fortsatte undersøgelser over corpus pineale hos pattedyrene. Kung. Danske Vidensk. Selsk. biol. medd. 3 (7), 1–30 (1921)
Krabbe, K.: L'organe sous-commissural du cerveau chez les Mammifères. Kung. Danske Vidensk. Selsk. biol. medd. 5 (4), 1–83 (1925)
Krabbe, K.: Récherches sur l'existence d'un oeil pariétal rudimentaire (le corpuscule pariétal) chez les Mammifères. Kung. Danske Vidensk. Selsk. biol. medd. 8 (3), 1–35 (1929)
Marburg, O.: Neue Studien über die Zirbeldrüse. Arb. Neurol. Inst. Wien 23, 1–35 (1920)
Marsland, T.A., Glees, P., Erikson, L.B.: Modification of the Glees silver impregnation for paraffin sections. J. Neuropathol. Exp. Neurol. 13, 587–591 (1954)
Naoumenko, J., Feigin, I.: A stable silver solution for axon staining in paraffin sections. J. Neuropathol. Exp. Neurol. 26, 669–673 (1967)
Romijn, H.J.: Structure and innervation of the pineal gland of the rabbit, Oryctolagus cuniculus (L.). I. A light microscopic investigation. Z. Zellforsch. 139, 473–485 (1973)
Wilkinson, H.J.: Further experimental studies on the innervation of striated muscle. J. comp. Neurol. 59, 221–238 (1934)
Yamada, H.: Beiträge zur Anatomie des Epithalamus, und zwar der Epiphyse bei der Echidna. Arb. Anat. Inst. Sendai 21, 149–171 (1938)
Yamada, H.: Beiträge zur Anatomie der Epiphyse bei Beuteltieren. Arb. Anat. Inst. Sendai 24, 169–231 (1941)
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Kenny, G.C.T., Scheelings, F.T. Observations of the pineal region of non-eutherian mammals. Cell Tissue Res. 198, 309–324 (1979). https://doi.org/10.1007/BF00232013
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DOI: https://doi.org/10.1007/BF00232013