Browsing by Author "Inzunza, Óscar"

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    Effect of pre and postnatal retinal deprivation on the striate-peristriate cortical connections in the rat
    (1994) Bravo Contreras, Hermes; Inzunza, Óscar
    The tangential distribution of the striate-peristriate cortical connections in normal, postnatally eye enucleated and congenitally anophthalmic rats, was studied after a single injection of wheat germ agglutinin conjugated with horseradish peroxidse into the striate cortex. The typical normal pattern of separate fields in the peristriate cortex is altered in eye enucleated animals, in such a way that their areal distribution in the cerebral cortex is increased and each field tends to fuse with the adjacent one. This process is more marked in anophthalmic animals, a finding that is in agreement with the notion that ganglion cells exert their influence before the visual pathway is functional.
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    Polygastric flexor muscle of the index finger and its clinical implications
    (2023) Riveros, Andrés; Inzunza, Óscar; Burdiles, Álvaro; Farfán, Emilio
    Although muscle variations in the forearm have been widely reported, the presence of supernumerary muscles in this compartment may be associated with compressive disorders of the nerves of the upper limb. The purpose of this study was to report the finding of a polygastric flexor muscle of the index finger (PFID), a supernumerary muscle associated with the anterior compartment of the forearm, the morphology and pathway of which are closely related to the median nerve. The PFID was found in a routine dissection of an upper right limb. Following a dissection methodology by planes, a narrow, polygastric muscle was identified, formed sequentially and interspersed by four tendons and three muscle bellies, that extended between the common flexor muscle mass of the anterior compartment of the forearm and the index finger. The sixth part of the PFID was partially in the carpal tunnel and established close relation with the median nerve, which was displaced superficially. Knowledge of this and other muscle variations that appear in the forearm and carpal tunnel are relevant when performing a differential diagnosis of carpal tunnel syndrome or in planning surgery on this canal.
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    The oculomotor nucleus, not the abducent, innervates the muscles which advance the nictitating membrane in birds
    (1985) Bravo Contreras, Hermes; Inzunza, Óscar
    The topographic distribution of the neurones that innervate the muscles that advance the nictitating membrane in birds was studied using intra-axonal retrograde transport of horseradish peroxidase. The motor neurones are distributed in the oculomotor complex of the ipsilateral and contralateral sides. In the ipsilateral side, the neurones innervating the pyramidalis muscles were located in the dorsolateral, dorsomedial and ventromedial subnuclei, while those neurones innervating the quadratus muscle were found in the dorsomedial and dorsolateral subnuclei. In the contralateral side the neurones innervating both the pyramidalis and quadratus were distributed in the ventromedial and ventrolateral subnuclei. The sensory neurones were found in the trigeminal ganglion and trigeminal mesencephalic nucleus.