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The morphology and distribution of peptide-containing neurons in the adult and developing visual cortex of the rat. I. Somatostatin

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Journal of Neurocytology

Summary

Using conventional immunocytochemical techniques, we have examined the morphology and distribution of somatostatin-like immunoreactive neurons in the visual cortex of albino rats between the first postnatal day and maturity. In the adult, somatostatin-immunoreactive neurons were observed in layers II to VI but were concentrated in layers II and III. These cells displayed morphological features characteristic of the multipolar and bitufted varieties of cortical non-pyramidal neurons as described in Golgi preparations of rat visual cortex.

On the first postnatal day and in the subsequent few days, immunoreactivity was confined to immature bipolar and multipolar neurons concentrated in layers V and VI. Labelled cells first appeared in the more superficial layers at the beginning of the second postnatal week and attained a distribution similar to that observed in adult animals at the end of this week. At this time they closely resembled their adult counterparts from which they appeared indistinguishable by the end of the third postnatal week. The late appearance of labelled cells in the superficial layers, where they are predominantly located in adult animals, suggests that the somatostatin immunoreactivity exhibited by most of these neurons develops several days after they have completed their migration and assumed their positions in the visual cortex.

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Authors and Affiliations

  1. Department of Cell Biology, The University of Texas Health Science Center, 75235, Dallas, Texas, USA

    John K. McDonald & John G. Parnavelas

  2. Department of Physiology, The University of Texas Health Science Center, 75235, Dallas, Texas, USA

    John K. McDonald & James I. Koenig

  3. Department of Anatomy, Veterinary School, University of Thessaloniki, Greece

    Azarias N. Karamanlidis

  4. Center for Ulcer Research and Education, Veterans Administration Center-Wadsworth, Los Angeles, California, USA

    Nicholas Brecha

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  4. Nicholas Brecha
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  5. James I. Koenig
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McDonald, J.K., Parnavelas, J.G., Karamanlidis, A.N. et al. The morphology and distribution of peptide-containing neurons in the adult and developing visual cortex of the rat. I. Somatostatin. J Neurocytol 11, 809–824 (1982). https://doi.org/10.1007/BF01153520

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