What's the difference between mesonephros and pronephros?
Mesonephros
Definition:
(n.) The middle one of the three pairs of embryonic renal organs developed in most vertebrates; the Wolffian body.
Example Sentences:
(1) They are rounded or oval bodies visible to the naked eye, and situated ventrolaterally in the posterior mesonephros.
(2) the mesonephros plays no part whatsoever in the formation of the ovary.
(3) In Tilapia mossambica organized lymphoid tissues are present in the thymus, head-kidney and spleen, whereas they are lacking in pericardial tissue, liver, mesonephros, intestine and rectum.
(4) Leukemia cells were inoculated on slices of chick embryo mesonephros incubated for 24h; at this time the fragments are completely encapsulated.
(5) The mesonephros was found to be the major source of somatic cells to the developing gonad, though a contribution from the coelomic epithelium could not be excluded, and interstitial tissue appeared to arise from mesenchymal cells.
(6) By means of purified rabbit anti-adult chicken kidney antibodies two types of antigens have been identified in the mesonephros: one, localised in the cells of the proximal segment of the secretory tubules, the other characteristic of the collecting segments derived from the Wolffian duct.
(7) In both species the primary haemopoietic organs are the pronephros, the mesonephros and the spleen.
(8) Haemosiderin occurs in lesser amounts and melanin is almost restricted to kidney MMCs,--mainly mesonephros--.
(9) In this paper, remarkable changes of these antigens, defined by respective monoclonal antibodies FH3, FH4, and FH6, in fetal kidney (mesonephros and metanephros) and other urogenital organs, as well as in various types of kidney tumors, have been investigated.
(10) This may be significant as regards the exact stage of incubation during which the involution of mesonephros begins.
(11) Reaching the presumptive gonadal area on the mesonephros, the germ cells join with the mesonephric-derived cells.
(12) For the purpose of establishing a methodology whereby concomitant histology and histochemistry could be obtainable, various fixatives and fixation times have been evaluated on GMA embedded chick embryonic mesonephros and gonad.
(13) The action is selective, neither the Wolffian duct nor the mesonephros are attaqued.
(14) At day 4 of embryonic development strong cKr1 hybridization signals are found in the brain and neural tube, in the mesonephros and in the gut, respectively.
(15) At day 15 and 16 the gubernaculum testis is seen as a mesenchymal cord that extends from mesonephros to the pelvic floor.
(16) That the scaling of kidney mass in neonatal lizards and marsupials is the same as that of adults only if the mass of both the mesonephros and metanephros are combined suggests that the mesonephric kidney in these vertebrates plays a significant role in the regulation of water and ion balance during development and for at least a short time after birth.
(17) The poor limb outgrowth was correlated with either the lack of or the presence of a rudimentary mesonephros on the operated side.
(18) The formation of the medulla rudiment starts in 1.5 month old embryo when the gonad is separated from mesonephros and connected with it via the ovary gate.
(19) These results are discussed in terms of sexual differentiation and the development stage of the mesonephros.
(20) However, the presence of link protein transcripts in the mesonephros, independent of cartilage proteoglycan core protein gene expression, indicates that these genes can be regulated independently of each other.
Pronephros
Definition:
(n.) Alt. of Pronephron
Example Sentences:
(1) In both species the primary haemopoietic organs are the pronephros, the mesonephros and the spleen.
(2) These six metameres also are responsible for the existence of the pronephros.
(3) This strain could, however, be frequently reisolated from the pronephros of fish in the test group concerned.
(4) The separation techniques used seemed to be suitable for isolation of different populations of pronephros cells.
(5) We tested the ability of fish sublethally infected with virulent and avirulent A. salmonicida to mount a humoral immune response to sheep erythrocytes and found fewer plaque forming cells in the pronephros and lower serum anti-SRBC antibodies in infected fish as compared to controls.
(6) The brain, the optic stalk, the auditory vesicle, the pronephros, and single cells in the spinal cord and the hindbrain express Pax-2 in both species.
(7) Moreover, responses to the immunogen preceded responses to donor pronephros tissue by 2 days, occurring on day 2 or day 4.
(8) N-cadherin is present in several mesodermal derivatives such as the notochord, the pronephros, and the heart.
(9) After challenge with strains from eel mucus and seawater, mortality was not produced, and furthermore, these strains could not be reisolated from the pronephros.
(10) The formation of eosinophils and heterophils occurred in the interstices of the pronephros and opisthonephros, in the mesenchymal sheath surrounding the pronephric duct, as well as in the mesentery and mesenchymal coat of the bile duct and hepatic ducts.
(11) The potencies of isolated embryonic hemopoietic organs (pronephros and liver) of Rana temporaria L. to the formation of the foci of hemopoiesis were studied.
(12) Cells isolated from the pronephros of carp were incubated in vitro with the organophosphorus insecticide trichlorfon or dichlorvos, each of which is used in aquaculture to eliminate fish ectoparasites.
(13) Emphasis is placed on the decreasing functional significance of the pronephros with evolutionary development, to the extent that the role of the pronephros in the human is questioned.
(14) Embryogenesis of hemopoietic cell populations in the pronephros of Rana pipiens was examined during embryonic and early larval development.
(15) Peculiarities of renal corpuscle's structural organization of a number of animals representing various classes of vertebrates have been studied on submicroscopic level at the stages of excretory organs formation: pronephros, mesonephros and metanephros.
(16) Lymphocytes from the pronephros of carp (Cyprinus carpio L) have been subjected to transformation by mitogens, concanavalin A (Con A), phytohemagglutinin (PHA), and lipopolysaccharides (LPS), with Zn or Mn at varying concentrations.
(17) The isolates rarely formed pronephros, mesothelium, or mesenchyme, derivatives of ventral mesoderm, during normal development.
(18) In vitro degradation of 125I-formaldehyde treated human serum albumin (fHSA) in char (Salmo alpinus L.) pronephros cells was studied.
(19) Two weeks after the second immunization, recipient splenocytes were tested for alloreactivity toward donor and third-party pronephros cells.
(20) During kidney morphogenesis, expression is initially restricted to the epithelial compartment of the pronephros and mesonephros.