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Université de Fribourg

Structure and development of the subesophageal zone of the Drosophila brain. II. Sensory compartments

Kendroud, Sarah ; Bohra, Ali A. ; Kuert, Philipp A. ; Nguyen, Bao ; Guillermin, Oriane ; Sprecher, Simon G. ; Reichert, Heinrich ; VijayRaghavan, Krishnaswamy ; Hartenstein, Volker

In: Journal of Comparative Neurology, 2018, vol. 526, no. 1, p. 33–58

The subesophageal zone (SEZ) of the Drosophila brain processes mechanosensory and gustatory sensory input from sensilla located on the head, mouth cavity and trunk. Motor output from the SEZ directly controls the movements involved in feeding behavior. In an accompanying paper (Hartenstein et al., 2017), we analyzed the systems of fiber tracts and secondary lineages to establish reliable...

Université de Fribourg

The hooked element in the pes of turtles (Testudines): a global approach to exploring primary and secondary homology

Joyce, Walter G. ; Werneburg, Ingmar ; Lyson, Tyler R.

In: Journal of Anatomy, 2013, vol. 223, no. 5, p. 421–441

The hooked element in the pes of turtles was historically identified by most palaeontologists and embryologists as a modified fifth metatarsal, and often used as evidence to unite turtles with other reptiles with a hooked element. Some recent embryological studies, however, revealed that this element might represent an enlarged fifth distal tarsal. We herein provide extensive new myological and...

Université de Fribourg

Quantitative analysis of postnatal neurogenesis and neuron number in the macaque monkey dentate gyrus

Jabès, Adeline ; Banta Lavenex, Pamela A. ; Amaral, David G. ; Lavenex, Pierre

In: European Journal of Neuroscience, 2010, vol. 31, no. 2, p. 273-285

The dentate gyrus is one of only two regions of the mammalian brain where substantial neurogenesis occurs postnatally. However, detailed quantitative information about the postnatal structural maturation of the primate dentate gyrus is meager. We performed design-based, stereological studies of neuron number and size, and volume of the dentate gyrus layers in rhesus macaque monkeys (Macaca...

Université de Fribourg

Development and spatial organization of the air conduits in the lung of the domestic fowl, Gallus gallus variant domesticus

Makanya, A.N. ; Djonov, Valentin

In: Microscopy Research and Technique, 2008, vol. 71, no. 9, p. 689-702

We employed macroscopic and ultrastructural techniques as well as intratracheal casting methods to investigate the pattern of development, categories, and arrangement of the air conduits in the chicken lung. The secondary bronchi included four medioventral (MVSB), 7-10 laterodorsal (LDSB), 1-3 lateroventral (LVSB), several sacobronchi, and 20-60 posterior secondary bronchi (POSB). The latter...

Université de Fribourg

Onset of synaptogenesis in the plexiform layers of the chick retina: A transmission electron microscopic study

Drenhaus, Ulrich ; Voigt, Tilman ; Rager, Günter

In: Microscopy Research and Technique, 2007, vol. 70, no. 4, p. 329 - 335

The presently acknowledged onset of synaptogenesis in the chick retina from embryonic day 12 (E12) onward stands in contrast with the appearance of spontaneous electrical activity, of presynaptic proteins, or of neurotransmitters during early formation of the inner (E6-E8) and outer (E9) plexiform layers. Therefore, we investigated the chick retina from E6 to E12 at which age first synapses...

Université de Fribourg

Developmental changes in Parvalbumin regulate presynaptic Ca²⁺ signaling

Collin, Thibault ; Chat, Mireille ; Lucas, Marie Gabrielle ; Moreno, Herman ; Racay, Peter ; Schwaller, Beat ; Marty, Alain ; Llano, Isabel

In: The Journal of Neuroscience, 2005, vol. 25(1), p. 96

Certain interneurons contain large concentrations of specific Ca²⁺-binding proteins (CBPs), but consequences on presynaptic Ca²⁺ signaling are poorly understood. Here we show that expression of the slow CBP parvalbumin (PV) in cerebellar interneurons is cell specific and developmentally regulated, leading to characteristic changes in presynaptic Ca²⁺ dynamics (Cai). Using...