The axon initial segment of corticocollicular neurons in the rabbit visual cortex, an electron-microscope study with HRP

The synaptic connections of the axon initial segment (IS) of retrogradely labeled corticocollicular neurons in the rabbit visual cortex were studied using the HRP-EM method. Identified IS showed relatively few synaptic boutons unevenly distributed along their surface. All these axo-axonic terminals contained pleomorphic vesicles and formed symmetrical synaptic junctions with the IS. The possible origin and chemical nature of these synaptic boutons are discussed

Dense cored vesicles in presynaptic profiles of the rabbit dorsal lateral geniculate nucleus

We are carrying out a study about the synaptic relations between identified synaptic profiles in the dorsal lateral geniculate nucleus (dLGN) of the rabbit. Here. the types of synaptic vesicle containing profiles of the dLGN are described. There are presynaptic large profiles containing round vesicles and pale mitochondria (RLP terminals) and small profiles that contain round vesicles and dark mitochondria (RSD termiilals) which respectively arise from the retina and the visual cortes. Another type of presynaptic profile contains elliptical vesicles (F-boutons) which can be subdivided according to their cytoplasmic content. These F-boutons arise from dLGN interneurons. We have found different sized vesicles that have a dense core within RLP, and F terminals rind a possible RSD terminal. The significance of the coesistance of pale and dense cored vesicles in the presynaptic profiles of the rabbit dLGN is discussed

Mediterranean and atlantic. archaeometallurgy of the late bronze age and early iron age from the settlement El Morredón (Fréscano, Zaragoza) [Mediterráneo y Atlántico. Arqueometalurgia del bronce final y primera edad del hierro en el poblado de el Morredón (Fréscano, Zaragoza)]

The excavations carried out between 2002 and 2004 at El Morredón, a Late Bronze and Early Iron Age site located in the Huecha valley, Zaragoza, have enabled the site to be revised and its unpublished materials to be studied using new techniques and methodologies. The metallic repertoire of the site is identified with a set of domestic objects, mostly made of bronze, of a reduced typology, in which decorative objects predominate, followed by weapons and working tools. In order to determine the composition of the metallic materials, X-ray fluorescence –xrf– analyses were carried out. The presence of two different alloys has been documented: Cu-Sn binary bronze and Cu-Sn-Pb ternary bronze. This composition points to possible connections with the Lower Ebro and, in turn, with the Southern Meseta, Levante or Andalusia, while the typology of some pieces seems to be linked to the Atlantic or Central European Bronze tradition. The metallurgical production that took place in the settlement itself is another example of the confluence of Mediterranean and Atlantic traditions, which is becoming increasingly clearer and more intense in this area. © 2021 Ediciones Universidad de Salamanca. All rights reserved

Layers I and VI of the visual cortex in the rabbit. A correlated Golgi and immunocytochemical study of somatostatin and vasoactive intestinal peptide containing neurons

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