Microstructure of some muscles of the pelvic limb of the Siberian roedeer (Capreolus pygargus)

The aim of the study is to investigate the microstructural features of some muscles of the pelvic limb of the Siberian roedeer (Capreolus pygargus). The study was carried out at the Department of Anatomy, Pathological Anatomy and Surgery of the Institute of Applied Biotechnology and Veterinary Medicine of the Krasnoyarsk State Agrarian University in 2024. The material for histological examination was pieces of the muscles of the pelvic limb of the roedeer: the middle gluteus muscle (m. gluteus medius), the quadriceps femoris and the gastrocnemius muscle of the lower leg (m. gastrocnemius). The preparations were stained with hematoxylin and eosin, connective tissue - using the Picro Mallory method and the Van Gieson method. The muscle fibers in the muscles of the pelvic limb of the roedeer had a typical striated structure, they are united by single thin endomysial fibers into bundles of the first order. In the middle gluteus muscle, each bundle of the first order contains from 33 to 75 muscle fibers. In the wide partitions dividing the bundles of the second order, wide sinuous collagen fibers and a significant accumulation of fatty tissue were found. In the quadriceps muscle of the thigh, in the bundles of the first order there were from 38 to 110 muscle fibers. In cross sections, the muscle fibers had an irregular shape with myofibrils occupying most of the sarcoplasm, ‘Cohnheim fields’ were visible in most of the fibers. Collagen fibers and fibroblasts were present in the perimysium. In the gastrocnemius muscle, the cross-section clearly shows the architectonics of the first-order muscle fiber bundles, where there were from 14 to 49 muscle fibers. The endomysium and perimysium were characterized by the absence or very small number of connective tissue fibers.They were present only in large partitions connecting the second-order bundles. The gastrocnemius muscle of the roe deer had the smallest number of muscle fibers in the first-order bundles - (29.9 ± 4.14), while in the quadriceps muscle of the thigh their number was (56.2 ± 8.05), and in the gluteus medius - (51.4 ± 5.31), which is 1.9 (P function show_eabstract() { $('#eabstract1').hide(); $('#eabstract2').show(); $('#eabstract_expand').hide(); }