Type, diameter and distribution of fibres in some respiratory and abdominal muscles of the goat

Abstract

This study was designed to determine the histochemical properties, size and composition of fibres in the diaphragm, intercostal and abdominal muscles of goats to clarify whether reported similarities in respiratory muscle physiology between goats and humans have a structural basis. Serial sections (10 microns) of muscular tissue from adult female goats were stained for myosin adenosine triphosphatase and reduced nicotinamide adenine dinucleotide dehydrogenase-tetrazolium reductase activities; the fibres were classified into type I, IIA and IIB; and their mean diameter and composition were determined. Abdominal and intercostal muscles contained types I, IIA and IIB fibres in the ratio 1:1:1, and the mean diameter of the fibres ranged from 49.2 to 62.2 microns. In contrast, the diaphragm contained 58.9% type I and 41.1% type II fibres, and the latter could not be differentiated into types IIA and IIB. Diaphragmatic fibres were also smaller (36.9-40.9 microns). These findings contrast with those in humans, where the diaphragm, intercostal and abdominal muscles contain > 50% type I fibres and have fibres of identical diameter. The differences in fibre characteristics between the diaphragm, intercostal and abdominal muscles of goats and the differences between goats and humans need to be taken into consideration in interpreting the results from studies in respiratory muscle physiology.

Dynamic urinary graciloplasty in male goats: A study on histology and urethral pressures

“…The type I fibers diameter without stimulation was slightly smaller than the reported diameters of the abdominal wall [11]. The type I fiber diameter decreased in the two goats, whereas the type II fibers had the same diameter.…”

“…Others reported comparable percentages of type I fibers of the goat latissimus dorsi muscles [10], and increases of type I fibers of the abdominal wall muscles [11] at 20-30%. Since these muscles have a function comparable to that of the gracilis muscle, the observed percentages seem representative.…”

Morphometry and Histochemistry of the Rectus abdominis Muscle Fibers of Tufted Capuchin Monkeys (Cebus apella Linnaeus, 1758)

“…Another quadrupedal that had its rectus abdominis muscle studied was the sheep, Ibebunjo (1993); in which the 3 fiber types (I, IIA, and IIB) were found in equal proportion, different from the data found for the tufted capuchin monkey. In terms of frequency, this research found a predominance for fast twitch fibers in all 4 regions, as observed by Ibejunjo, who analyzed abdominal muscles in sheep.…”

Morphological Characterization of Diaphragm in Common Squirrel Monkey (Saimiri sciureus)

“…In goats, 58.9% of fibers present are Type I, and 41.1% are Type II. In humans, more than 50% of these fibers are Type I (Ibebunjo 1993).…”