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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

Early effects of carbachol on the morphology of motor endplates of mammalian skeletal muscle fibers

Voigt, Tilman

In: Muscle & Nerve, 2010, vol. 41, no. 3, p. 399 - 405

Long-term disturbance of the calcium homeostasis of motor endplates (MEPs) causes necrosis of muscle fibers. The onset of morphological changes in response to this disturbance, particularly in relation to the fiber type, is presently unknown. Omohyoid muscles of mice were incubated for 1-30 minutes in 0.1 mM carbachol, an acetylcholine agonist that causes an inward calcium current. In these...