Retinotopic maps in the pulvinar of bush baby (otolemur garnettii)

Despite its anatomical prominence, the function of the primate pulvinar is poorly understood. A few electrophysiological studies in simian primates have investigated the functional organization of pulvinar by examining visuotopic maps. Multiple visuotopic maps have been found for all studied simians...

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Published in:Journal of comparative neurology (1911) 2013-10, Vol.521 (15), p.3432-3450
Main Authors: Li, K., Patel, J., Purushothaman, G., Marion, R.T., Casagrande, V.A.
Format: Article
Language:English
Subjects:
Animals
Brain Mapping - methods
Central Nervous System - cytology
Central Nervous System - physiology
chemoarchitecture
Data Interpretation, Statistical
Electrodes, Implanted
Electrophysiological Phenomena
electrophysiology
Female
Galago - physiology
greater galago
Imaging, Three-Dimensional
Immunohistochemistry
Male
Microelectrodes
Peripheral Nerves - cytology
Peripheral Nerves - physiology
Photic Stimulation
Pulvinar - anatomy & histology
Retina - anatomy & histology
single unit
thalamus
vision
Vision, Ocular - physiology
Visual Cortex - physiology
Visual Pathways - anatomy & histology
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Summary:Despite its anatomical prominence, the function of the primate pulvinar is poorly understood. A few electrophysiological studies in simian primates have investigated the functional organization of pulvinar by examining visuotopic maps. Multiple visuotopic maps have been found for all studied simians, with differences in organization reported between New and Old World simians. Given that prosimians are considered closer to the common ancestors of New and Old World primates, we investigated the visuotopic organization of pulvinar in the prosimian bush baby (Otolemur garnettii). Single‐electrode extracellular recording was used to find the retinotopic maps in the lateral (PL) and inferior (PI) pulvinar. Based on recordings across cases, a 3D model of the map was constructed. From sections stained for Nissl bodies, myelin, acetylcholinesterase, calbindin, or cytochrome oxidase, we identified three PI chemoarchitectonic subdivisions, lateral central (PIcl), medial central (PIcm), and medial (PIm) inferior pulvinar. Two major retinotopic maps were identified that cover PL and PIcl, the dorsal one in dorsal PL and the ventral one in PIcl and ventral PL. Both maps represent central vision at the posterior end of the border between the maps, the upper visual field in the lateral half and the lower visual field in the medial half. They share many features with the maps reported for the pulvinar of simians, including the location in pulvinar and the representation of the upper–lower and central–peripheral visual field axes. The second‐order representation in the lateral map and a laminar organization are likely features specific to Old World simians. J. Comp. Neurol. 521:3432‐3450, 2013. © 2013 Wiley Periodicals, Inc. Two retinotopic maps were identified electrophysiologically in bush baby lateral (PL) and inferior (PI) pulvinar. In PI three additional chemoarchitectonic subdivisions were identified (not shown). The location and orientation of these maps in pulvinar are similar but not identical between prosimians and simians. The maps are depicted on the drawing of a coronal section in which + and − represent upper and lower visual fields and numerals represent eccentricity. LGN, lateral geniculate nucleus.
ISSN:0021-9967
1096-9861
DOI:10.1002/cne.23358