Gender-related differences of motoreurons morphometric properties of the rat medial gastrocnemius muscle

• Autorzy: Mierzejewska-Krzyzowska B. , Bukowska D. , Szydlowska J. , Drzymala-Celichowska H. , Celichowski J.
• Języki publikacji: EN

Abstrakty

EN

Gender differences are a well-known phenomenon in animal kingdom and concern body mass and morphology. The aim of this study was to determine the gender differences in the number and size of alpha and gamma motoneurons in motor nucleus of the medial gastrocnemius (MG) in the rat. The retrogradely labeled cell bodies of motoneurons of the same age male and female Wistar rats were studied following a bath of the proximal stump of the transected MG nerve in the horseradish peroxidase solution. The number and the soma diameters of male and female MG motoneurons were determined from serial microscopic images of stained sections using the Sony CCD-Iris Camera and MultiScanBase System. It was shown that weight of the central nervous system was on average 19% higher in males than in females. The mean number of motoneurons was 11% higher in males than in females and amounted to 95 and 86 motoneurons, respectively. In each case, the average soma diameters of motoneurons in motor nucleus were distributed bimodally: motoneurons smaller than 32.5 micrometer were recognized as gamma and greater ones as alpha motoneurons. In the present material the percentage composition of gamma (22%) and alpha (78%) motoneurons were very similar in both sexes. The mean number of alpha motoneurons was 13% higher in males than in females, but differences between the mean soma diameter in the two kinds of motoneurons, gamma and alpha, in both sexes were not significant. It is concluded that a total number of motoneurons in the rat MG motor nucleus in males and females is different. Whereas in females the number of alpha and gamma motoneurons is smaller than in males, the size of motoneurons is similar. Therefore, the gender differences in weight of the central nervous system reflect rather a difference in a total number of neurons than in their size.

• Wydawca: -
• Czasopismo: Acta Neurobiologiae Experimentalis
• Rocznik: 2011
• Tom: 71
• Numer: S
• Opis fizyczny: p.82

Twórcy

autor

Mierzejewska-Krzyzowska B.

• Department of Anatomy and Anthropology, University School of Physical Edication in Gorzow Wlkp., Gorzow Wlkp., Poland

autor

Bukowska D.

• Department of Neurobiology, University School of Physical Education in Poznan, Poznan, Poland

autor

Szydlowska J.

• Department of Anatomy and Anthropology, University School of Physical Edication in Gorzow Wlkp., Gorzow Wlkp., Poland

autor

Drzymala-Celichowska H.

• Department of Neurobiology, University School of Physical Education in Poznan, Poznan, Poland

autor

Celichowski J.

• Department of Neurobiology, University School of Physical Education in Poznan, Poznan, Poland

Uwagi

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