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Biomedical subjects

A Veggetti

Publications and source records attributed to A Veggetti.

At least 37 records · Page 2Linked to original sources
PubMed1979

A comparative histochemical study of intrinsic laryngeal muscles of ungulates and carnivores.

The intrinsic laryngeal muscles of the horse, donkey, sheep, ox, pig, dog and cat were examined for myosin ATPase, following acid and alkali pre-incubation, SDH and M-alphaGPDH activities. In all laryngeal muscles two fibre types, betaR and alphaR, belonging to slow and fast-contracting, fatigue-resistant motor units (types S and FR) were present in different proportions. The alphaW fibre type, belonging to fast-contracting and fatigue-resistant motor units was absent (type FF). The alphaR fibres of the dog and the cat were subdivided into groups by the various degrees of acid stable myosin ATPase, oxidative and glycolytic activities. In the ox and pig laryngeal muscles, the same fibres showed an atypical myosin ATPase activity, as high as the fast-contracting fibres but acid-resistant like the slow-twitch fibres. The most uniform muscle was the CAD, which was formed of a higher percentage of slow-twitch fibres than the other laryngeal muscles of the same species. Also the VE muscle was very uniform in the dog, horse and donkey but the fast-twitch fibres were by far the most numerous, the highest in fact among all the laryngeal muscles. In the TA muscle of the cat, sheep and ox, the percentage of fast-twitch fibres was very high in the rostral portion decreasing gradually towards the caudal portion. Thus it was possible to separate histochemically the TA muscle in the rostral (pars ventricularis) and caudal (pars vocalis) portions which are related to the VE and the VO muscles of the dog, horse and donkey. In the VO muscle the slow-twitch fibres are more numerous than in the VE. The two portions of the TA were not detected by histochemical methods in the pig. However, this muscle has the highest percentage of fast-twitch fibres. The qualitative and quantitative data presented in this paper together with the data reported in the literature, enable us to correlate morphological and functional aspects of fibre composition among the species.

Animals↗
PubMed1977

Afferent fibers and sensory ganglion cells within the oculomotor nerve in some mammals and man. I. Anatomical investigations.

The present research shows that sensory ganglion cells are located within the oculomotor nerve of monkeys and man. Furthermore, afferent fibers have been found in the IIIrd nerve of all the animals examined (lamb, pig, cat, dog and monkey). These fibers have their perikarya prevalently in the semilunar ganglion. Their pathway could be studied after section of either the trigeminal ophthalmic branch or of the intracranial portion of the IIIrd nerve. Following these operations, degenerating fibers were found entering the brain stem through the oculomotor nerve. In the brain stem, they were traced through the pons and the medulla and were seen to end in the spinal cord, within the subnucleus gelatinosus of the nucleus caudalis trigemini. Their degenerating endings found in the neuropil of the SG Rolandi, represented peripheral axonal endings of the glomeruli, rather than central axonal endings, as was the case after trigeminal rhizotomy. On the basis of these different degenerating patterns, the conclusion can be reached that the perikarya of the afferent fibers located in the semilunar ganglion represent, in reality, a ganglion of the IIIrd nerve.

Anatomy, Comparative↗