Observations on the lamination of the lateral geniculate body in some primates

Kanagasuntheram, R.; Krishnamurti, A; Wong, Weng-Fai

doi:10.1016/0006-8993(69)90203-0

Cited by 15 publications

(7 citation statements)

References 10 publications

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“…On the other hand, we found that five of the nine monkeys without anomalous fingers also had subsidiary laminae. In addition, reports of subsidiary lamination of the LGN, without anomalies similar to the fingers described here, exist for several non-human primate species, including macaque (Le Gros Clark and Penman 1934;Kanagasuntheram et al 1969;Kaas et al 1978), chimpanzee (Chacko 1954;Tigges et al 1977), and gibbon (Chacko 1954; however, see also Tigges and Tigges 1987). Thus, if there are common mechanisms underlying the development of both anomalous fingers and subsidiary layers, our data indicate that they do not always result in the concomitant expression of both anomalies.…”

Section: Discussionmentioning

confidence: 63%

“…Most commonly, the anomalies involve the development of subsidiary laminae (Le Gros Clark and Penman 1934;Balado and Franke 1937;Chacko 1954;Kanagasuntheram et al 1969;Tigges et al 1977;subleaflets of Kaas et al 1978). For instance, in macaque monkeys Le Gros Clark and Penman (1934) described cases in which the number of laminae had increased from six to eight.…”

Section: Introductionmentioning

confidence: 97%

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A morphological anomaly of the dorsal lateral geniculate nucleus in Macaca fascicularis

O’Brien

Abel

Olavarría

1997

Cell and Tissue Research

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In the present report we describe a morphological anomaly of the thalamus. In three macaque monkeys (Macaca fascicularis), we observed up to five finger-like protrusions that emanated from the posterior pole of the dorsal lateral geniculate nucleus (LGN) and extended posteriorly between the lateral pulvinar and reticular nucleus of the thalamus. These anomalous fingers measured up to 1.7 mm in length and contained dense accumulations of neurons and glia. The fingers received a direct retinal input from the contralateral eye indicating that they were part of the LGN rather than of other adjacent thalamic nuclei. In order to determine with which subcompartment(s) of the LGN the fingers were associated (parvocellular, magnocellular, or intercalated layers), we examined the immunochemical properties and size of neurons in the fingers and LGN subcompartments. We concluded that the fingers were not associated with the intercalated layers, since neurons in the fingers did not stain with an antibody to calbindin-D28k, whereas intercalated neurons stained intensely with this antibody. In addition, neurons located in the fingers were significantly smaller than those found in the magnocellular layers but were not significantly different in size from neurons in the parvocellular layers. We therefore consider that the fingers are an anomaly of the parvocellular subcompartment of the LGN. Interestingly, in two of the three cases with anomalous fingers, we also observed subsidiary parvocellular laminae, suggesting that these two anomalies were related. In five additional animals, however, we observed subsidiary parvocellular laminae without anomalous fingers. Thus, if there are common mechanisms underlying the development of both anomalous fingers and subsidiary layers, our data indicate that they do not always result in the concomitant expression of both anomalies.

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Section: Discussionmentioning

confidence: 63%

Section: Introductionmentioning

confidence: 97%

A morphological anomaly of the dorsal lateral geniculate nucleus in Macaca fascicularis

O’Brien

Abel

Olavarría

1997

Cell and Tissue Research

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“…Also easily visible are other layers ventral to the magnocellular layers and dorsal to the axons of optic tract [e.g., Balado and Franke 1937; Kanagasuntheram et al 1969]. In most publications these have been called the S layers (SI – S external and SE – S external)[Kaas et al 1978], a term which could actually refer to either of two different things [Hendry and Reid 2000].…”

Section: Introductionmentioning

confidence: 99%

“…In addition, there have been some reports of variation in LGN laminar pattern within hominoids [Armstrong 1979; Chacko 1955a; Kanagasuntheram et al 1969; Tigges and Tigges 1987]. Little is known about how these variations in LGN lamination may be related to species-specific adaptations.…”

Section: Introductionmentioning

confidence: 99%

Lamination of the Lateral Geniculate Nucleus of Catarrhine Primates

Sousa¹,

Sherwood²,

Hof³

et al. 2013

Brain Behav Evol

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The lateral geniculate nucleus (LGN) of catarrhine primates - with the exception of gibbons - is typically described as a 6-layered structure, comprised of 2 ventral magnocellular layers, and 4 dorsal parvocellular layers. The parvocellular layers of the LGN are involved in color vision. Therefore, it is hypothesized that a 6-layered LGN is a shared-derived trait among catarrhines. This might suggest that in gibbons the lack of further subdivisions of the parvocellular layers is a recent change, and could be related to specializations of visual information processing in this taxon. To address these hypotheses, the lamination of the LGN was investigated in a range of catarrhine species, including several taxa not previously described, and the evolution of the LGN was reconstructed using phylogenetic information. The findings indicate that while all catarrhine species have 4 parvocellular leaflets, two main patterns of LGN parvocellular lamination occur: 2 undivided parvocellular layers in some species, and 4 parvocellular leaflets (with occasional subleaflets) in other species. LGN size was not found to be related to lamination pattern. Both patterns were found to occur in divergent clades, which is suggestive of homoplasy within the catarrhines in LGN morphology.

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“…The topogra phy of the retinal projections to the LGBd as identified by anatomical means corresponds closely to the electrophysiological maps of this feature in the gray squirrel [Kaas et al, 1972a] and the rat [M ontero et al, 1968]. The enormous diversity in size, shape and orientation of the lami nae of the LGBd in most other species [Kanagasuntheram et al, 1969;G uillery, 1970] makes it very difficult to compare retinal maps, but a common feature of the internal organization of the LGBd can be dis cerned, namely adjacent zones in different laminae characteristically re present the same point in the visual field whether they are connected to the ipsilateral or contralateral eye. Sanderson [1971b] recognizes this feature in defining a 'projection column' as the volume of space in the…”

Section: Dorsal Nucleus Of the Lateral Geniculate Body The Sciuridmentioning

confidence: 99%

Topography of Retinal Efferent Connections in Sciurids; pp. 362–375

Abplanalp¹

1974

Brain Behav Evol

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The sciurid retina projects to the contralateral superior colliculus, pretectal complex, ventral nucleus of the lateral geniculate body and to five distinct zones in the dorsal nucleus of the lateral geniculate. Ipsilateral projections are distributed to the same targets except the superior colliculus. Zones of terminal debris as identified by the Fink-Heimer method do not develop uniformly; instead some structures become argyrophyllic before others do so that an injudicious choice of survival times may produce misleading data.The topography of the retinal mosaic is preserved in all its projections except those to the accessory optic system. In the cases of the superior colliculus, ventral nucleus of the lateral geniculate body and the anterior pretectal nucleus, these retinal projections are in perfect register with other afferent connections which are also retinotopically organized. An enormous proportion of the cells in the dorsal nucleus of the lateral geniculate body are connected with the overlapping portions of the retina; only a very small part of this structure receives input from the much larger nonoverlapping retinal quadrants.

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Observations on the lamination of the lateral geniculate body in some primates

Cited by 15 publications

References 10 publications

A morphological anomaly of the dorsal lateral geniculate nucleus in Macaca fascicularis

A morphological anomaly of the dorsal lateral geniculate nucleus in Macaca fascicularis

Lamination of the Lateral Geniculate Nucleus of Catarrhine Primates

Topography of Retinal Efferent Connections in Sciurids; pp. 362–375

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