geoscience.net logo
+ Resolve Article
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter

+ Translate
+ Subscribe to Site Feed
GeoScience Most Shared ContentMost Shared Content

Aspectos ultraestructurales de los musculos del meropodito del cangrejo Cardisoma guanhumi Latreille


, : Aspectos ultraestructurales de los musculos del meropodito del cangrejo Cardisoma guanhumi Latreille. Acta Cientifica Venezolana, 331: 44-56

The structure of abductor and adductor leg muscles of the shore crab C. guanhumi, was studied by electron microscopy. Two different types of fibers were found, which have been designated A and B, respectively. A fibers are thick in diameter (about 180 .mu.m) and show short sarcomeres (4-6 .mu.m long). The M line appears diffuse and the Z line fine (approximate width = 133-145 nm), with a slightly jagged appearance. Cross sections of the A band showed irregular arrays of thin and thick filaments. Usually up to 15 thin filaments were found around a thick one. B fibers show a cross section diameter smaller than A fibers (approx. = 92 .mu.m). Long sarcomeres are present (7-10 .mu.m in length) and the Z lines are wide (approx. width = 260-280 nm), with a marked jagged appearance. Like A fibers, B fibers do not exhibit a distinct M line and show a large number of thin filaments (.ltoreq. 18) per thick filament. The sarcotubular system is well developed in both types of fibers, showing diads and triads at the level of A-I junctions. These structures are interconnected by a fenestrated collar - like sarcoplasmic reticulum. Mitochondria are observed in both types of fibers at the subsarcolemmal space, between myofibrils, in the vecinity of nuclei and at neuromuscular junctions. Both types of fibers possess a sarcoplasm rich in glycogen particles and are similarly innervated by several axons. Postsynaptic areas present some mitochondria, glycogen particles and narrow tubules which end in a labyrinth-like structure. A and B fibers may correspond to phasic and tonic fibers, respectively.

US$29.90


Other references

Perez Maria del Carmen; Perrilliat Montoya Maria del Carmen; Espinosa Arrubarrena Luis, 1995: Systematics of the paleontology collection at the Institute of Geology of the National Autonomous University of Mexico. Memoria de la

Cropper, C.F.J.; Ram, J.Milkhi., 1933: Observations on an Epidemic of Whooping-Cough at the Lawrence Royal Military School, Sanawar: With a Note on the Investigation of a Skin Reaction in This Disease. Indian Medical Gazette 68(5): 271-273

Konin J.G.; Perrin D.H.; Denegar C.R., 1990: Effects of dehydration on concentric and eccentric strength of the elbow flexor and knee extensor muscle groups. Athletic Training 25(2): 116

Zeman, J.; Martásek, P.; Rubín, A.; Simková, M.; Komárek, V.; Rothová, N.; Picková, J.; Cikert, M.; Lepsí, P., 1986: Lead poisoning in an infant. Ceskoslovenska Pediatrie 41(7): 407-408

Brown, D.E.; Libby, S.J.; Moreland, S.M.; McCoy, M.W.; Brabb, T.; Stepanek, A.; Fang, F.C.; Detweiler, C.S., 2014: Salmonella enterica causes more severe inflammatory disease in C57/BL6 Nramp1G169 mice than Sv129S6 mice. <I>Salmonella enterica</I> serovar Typhimurium (<I>S</I>. Typhimurium) causes systemic inflammatory disease in mice by colonizing cells of the mononuclear leukocyte lineage. Mouse strains resistant to <I>S</I>....

Thorén, P., 1979: Role of cardiac vagal C-fibers in cardiovascular control. Reviews of Physiology, Biochemistry and Pharmacology 86: 1-94

Tharapel, A.T.; Wilroy, R.S., 1986: Chromosomal basis of recurrent fetal losses. Indian Journal of Pediatrics 53(4): 461-470

Hirao, T.; Sakamoto, Y.; Kamada, M.; Hamada, S.I.hi; Aono, T., 1993: Tn antigen, a marker of potential for metastasis of uterine cervix cancer cells. Background. The expressions of Thomsen-Friedenreich antigen (T-Ag) and Tn antigen (Tn-Ag), precursors of MN blood group antigens, were examined in the tissues of squamous cell carcinoma of the uterine cervix from 111 patients to determine their cl...

Singh, C.; Biswas, A., 2014: Impact of gestational age on nuchal fold thickness in the second trimester. The purpose of this study was to establish gestational age (GA)-specific nomograms for nuchal fold thickness between 16 and 24 weeks. This retrospective cross sectional study included 32,207 women who underwent a second-trimester anomaly scan at t...

Wu, F.Mao.; Beuchat, L.R.; Doyle, M.P.; Mintz, E.D.; Wells, J.G.; Swaminathan, B., 2002: Survival and growth of Shigella flexneri, Salmonella enterica serovar enteritidis, and Vibrio cholerae O1 in reconstituted infant formula. Formula feeding is an alternative method to prevent mother-to-child infection with human immunodeficiency virus through breast-feeding in developing countries. Growth of bacterial pathogens in reconstituted infant formula has become a health hazar...