Studies on the fine structure of muscle fibres and contained crystalloids in basal socket muscle of the entoproct, Barentsia gracilis.
نویسنده
چکیده
Basal socket muscle fibres of Barentsia gracilis are morphologically similar to invertebrate muscles classified as slow, tonic-type muscles. They are divisible into a non-contractile bulbous and a contractile myofilamentous portion, are innervated on their non-contractile surface, and are obliquely striated. The electron density and myofilament packing vary from fibre to fibre. Some muscle fibres appear degenerate in that they contain disorganized-appearing myofilaments and electron-dense bodies morphologically reminiscent of autophagosomes found in cells undergoing cytolysis. A distinguishing feature of muscle fibres observed in B. gracilis is the presence of crystalloids, morphologically reminiscent of protein storage crystalloids found in other cell types. These crystalloids are seen to be composed of 30-70 A thick, helically shaped filaments arranged in a hexagonal lattice. Filaments have a pitch of 130—150 A and a tilt-angle of 35-45 degrees. Crosslinks occur between adjacent filaments at regular intervals. Crystalloids appear to be formed in the bulbous portion of muscle cells. Constituent, 30—70 A filaments appear to branch from crystalloids and are found free in the myofilamentous area of muscle fibres. The above evidence, coupled with evidence elsewhere in the literature, suggests that the crystalloids may be a storage form of myofilament precursor which relate either to myogenesis or to cyclic regenerative and degenerative phenomena known to occur in Entoprocts, including B. gracilis.
منابع مشابه
Effects of dietary diludine supplementation on growth, proximate composition, muscle and texture structure of rainbow trout juveniles
A feeding trial which lasted for eight weeks was conducted to investigate the effects of diludine such as growth promoter on feed efficiency, muscle structure and proximate composition of juvenile rainbow trout. Diludine was added at 0.0(D0) 0.2(D1), 0.5(D2) and 1(D3) g kg-1 to a casein-based diet, and every diet was given to the triplicated groups of juvenile rainbow trout. At the end of exper...
متن کاملEffects of dietary diludine supplementation on growth, proximate composition, muscle and texture structure of rainbow trout juveniles
A feeding trial which lasted for eight weeks was conducted to investigate the effects of diludine, a growth promoter, on feed efficiency, muscle structure and proximate composition of juvenile rainbow trout. Diludine was added at 0.0(D0) 0.2(D1), 0.5(D2) and 1(D3) g kg-1 to a casein-based diet, and every diet was given to the triplicated groups of juvenile rainbow trout. At the end of experimen...
متن کاملComparison of Copper Concentrations in Liver and Muscle of Squalius cephalus and Capoeta capoeta gracilis
The aim of this study was to determine and compare the concentration of copper (Cu) in liver and muscle of two fish species Squalius cephalus and Capoeta capoeta gracilis. The fish were caught in four sampling sites along Tajan River, Mazandaran Province, northern Iran. The concentration of Cu was determined using flame atomic absorption spectrometry. There were significant differences (P
متن کاملTissue remodeling investigation in varicose veins
Although the etiology of varicose veins remains unknown, recent studies have focused on endothelial cell integrity and function because the endothelium regulates vessel tone and synthesizes many pro- and anti-inflammatory factors. The aim of this study was to investigate the evidence involving the endothelium in the development of varicose vein disease. In addition, tissue remodeling was invest...
متن کاملReoperation Rate and Indication for Reoperation after Free Functional Muscle Transfers in Traumatic Brachial Plexus Injury
plexus injury. Few studies report the rate of revision surgeries following free functional muscle transfers. We examinedthe reoperation rate and indication for reoperation after primary reconstruction of upper extremity function with a freegracilis transfer after brachial plexus injury.Methods: From 2003-2016, we identified 25 patients who underwent a free functional gracilis ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید
ثبت ناماگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید
ورودعنوان ژورنال:
- Journal of cell science
دوره 4 2 شماره
صفحات -
تاریخ انتشار 1969