Medical Instructor, University of Kentucky College of Medicine
The even women's health center pembroke pines buy generic femara from india, dense and only softly stained dots in this cross-section reflect the even distribution of myofibrils (cf menstruation 6 weeks after giving birth order femara 2.5mg on-line. In fact pregnancy yoga discount 2.5mg femara with amex, the sarcolemma consists of the plasmalemma, the basal lamina and a network of delicate reticular fibers. Muscular Tissue 230 Striated Muscle-Psoas Muscle Muscular Tissue Longitudinal section through striated myofibrils with conspicuous sarcomere organization. In Z-bands, the actin filaments of two successive sarcomeres twist together and are cross-linked. Actin filaments in the form of I-bands (isotropic bands) flank both sides of the Z-band 2. The thicker myosin filaments form the Aband (anisotropic band) 3 of the myofibril. Actin and myosin filaments form a twisted helix and leave only the H-band 4 (light zone) in the middle of the A-band. The H-band consists only of myosin filaments, the I-bands only of actin filaments. Note the peripheral nucleus 6 close to the fiber surface under the sarcolemma (plasmalemma). By this definition, a sarcomere consists of an A-band and the two halves of the adjacent I-band 2 on each side. Muscular Tissue 232 Striated Muscle-Psoas Muscle Cross-section through bundles of myofibrils at the level of an A-band and the T-tubules 1 that cover the myofibril borders. The smooth endoplasmic reticulum, here called sarcoplasmic reticulum (sarcotubular system), forms a network around every myofibril as longitudinal system (L-system) and transverse system (T-tubules, T-system). Note the hexagonal organization of the thick myosin filaments and the fine spot-like structures, which correspond to cross-sectioned thin actin filaments. Actin filaments are thin (7 nm), about 1 m in length, and consist of actin, tropomyosin and troponin. The products of the histochemical reaction accumulate in the locations of mitochondria. In cross-sections, sarcosome-rich fibers (aerobic fibers) appear dark and densely granulated, the sarcosome-poor fibers (anaerobic fibers) appear light. Muscular Tissue 235 Skeletal Muscle-Tendon Linkage this figure provides a light microscopic image of the linkage between skeletal muscle fibers 1 and tendon fibers 2. The muscle fibers only appear to continue in the collagen fiber bundles of tendons and aponeuroses. In reality, the connection is made between the fine fiber matrix around the sarcolemma and the loose connective tissue in the immediate vicinity of the muscle fibers. There is no true continuity between contractile myofibrils and collagen fibrils. Individual tendon fibers finally merge in an acute angle to form tendons and aponeuroses. The myofibrils extend into the spaces between these processes, slide over the elongated actin filaments up to the blind ends of the processes and end at the inner plasmalemma.
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