Neuroendocrine complexes in the gut of the snail Helix aspersa.

abstract：:An otolith increment is composed of an incremental zone and a discontinous zone. Observation of the otoliths of Oreochromis niloticus with transmission and scanning electron microscopy reveals that organic fibers are concentrated in the discontinuous zone and are relatively scarce in the incremental zone. On the other...

journal_title：Journal of morphology

authors： Zhang Z

更新日期：1992-02-01 00:00:00

abstract：:The fine structure of midgut cells in two species of Cladocera (Crustacea: Branchiopoda) has unique features when it is compared to that in the midguts of other arthropods. Features which suggest that food is absorbed in digested form are: the presence of the peritrophic membrane, the glycocalyx, the almost complete a...

journal_title：Journal of morphology

authors： Quaglia A,Sabelli B,Villani L

更新日期：1976-11-01 00:00:00

abstract：:The common snook, Centropomus undecimalis, was induced to ovulate using a time-release, GnRH analogue. Ovulation occurred the afternoon or evening the day after hormone administration. The time of ovulation was established within half an hour. At ovulation, three fish per time-group were divided into 0, 6, 12, 18 hr a...

journal_title：Journal of morphology

authors： Grier HJ,Neidig CL,Quagio-Grassiotto I

更新日期：2017-04-01 00:00:00

abstract：:The form of amniote claws has been extensively investigated, often with inferences about ecological association being drawn from studies of their geometry. Various methods have been used to quantify differences in the geometry of claws, but rarely have the underlying assumptions of such methods been addressed. Here, w...

journal_title：Journal of morphology

authors： Tinius A,Patrick Russell A

更新日期：2017-02-01 00:00:00

abstract：:We investigated muscle development in the Japanese flounder Paralichthys olivaceus, focusing primarily on the cranial muscles, using a whole mount immunohistochemical staining method. It is well established that during the very early stages of morphogenesis, until 4 days post hatching (dph), muscles required for feedi...

journal_title：Journal of morphology

authors： Uji S,Kurokawa T,Suzuki T

更新日期：2010-07-01 00:00:00

abstract：:The SEM was used to study the development of respiratory structures in successive stages in relation to the overall changes occurring in the scorpions. Book lung development is a slow process, starting with spiracles and a sac-like atrium in the early embryo and continuing lamellar formation to 150 or more in the adul...

journal_title：Journal of morphology

authors： Farley RD

更新日期：2008-09-01 00:00:00

abstract：:Sexual dimorphism in the distribution of antennal sense organs is common among adults of the genus Periplaneta. In three out of the four strains of Periplaneta americana examined, adult males had more contact chemoreceptros than females. In the fourth strain of P. americana and in P. australasiae, P. brunnea, P. fulig...

journal_title：Journal of morphology

authors： Schafer R,Sanchez TV

更新日期：1976-06-01 00:00:00

abstract：:The fate and possible roles of the cytoskeleton in the process of conjugation in the hyptrich ciliate Euplotes aediculatus were investigated. Following the coalescence of the plasma membranes of the conjugant cells, a fusion zone or bridge of cytoplasm contributed by both partners is constructed. The sub-alveolar micr...

journal_title：Journal of morphology

authors： Geyer JJ,Kloetzel JA

更新日期：1987-04-01 00:00:00

abstract：:It has been hypothesized that fluctuating asymmetry (FA) may provide an indication of the functional importance of structures within an organism, with structures that more strongly impact fitness being more symmetric. Based on this idea, we predicted that for tetrapods in which the forelimbs and hindlimbs play an uneq...

journal_title：Journal of morphology

authors： Didde RD,Rivera G

更新日期：2019-04-01 00:00:00

abstract：:Transmission electron microscopy reveals that the spermatocytes of the hookworm Ancylostoma caninum contain an abundance of Golgi complexes, ribosomes, specialized membranous organelles, and long strands of smooth endoplasmic reticulum. These organelles remain abundant until the early spermatid stage of sperm developm...

journal_title：Journal of morphology

authors： Ugwunna SC

更新日期：1990-03-01 00:00:00

abstract：:Nematocytes containing microbasic mastigophores are intimately associated with accessory cells in the epidermis of Chironex fleckeri. Large microbasic mastigophores may be surrounded by seven to nine such cells. Each accessory cell possesses an apical portion containing secretory droplets and a basal portion which car...

journal_title：Journal of morphology

authors： Rifkin JF,Endean R

更新日期：1988-01-01 00:00:00

abstract：:The taxonomic history of the small frogs of the genus Pseudopaludicola from South America has been controversial. Phylogenetic inferences based on molecular data have identified four Pseudopaludicola clades, correlating with the known variation in karyotypes (2n = 22, 20, 18, and 16). In this study, the ultrastructure...

journal_title：Journal of morphology

authors： dos Santos JS,Introíni GO,Veiga-Menoncello AC,Recco-Pimentel SM

更新日期：2015-12-01 00:00:00

abstract：:Amphisabenia is a group of squamates adapted for a fossorial lifestyle. The skull is the animal's the main digging tool, and can present one of four principal shapes. The shovel-headed shape is considered to be the most specialized for digging. The South American genus Leposternon presents a shovel-headed morphotype, ...

journal_title：Journal of morphology

authors： Hohl LSL,Barros-Filho JD,Rocha-Barbosa O

更新日期：2018-11-01 00:00:00

abstract：:Pheromone systems from seven species of noctuid are examined. Much of the structure of scales from the wings and/or the abdomen is interpreted as a modification for secretion or release of a pheromone. Scales with an extremely complex surface provide a large evaporation surface, while those connected to secretory cell...

journal_title：Journal of morphology

authors： Clearwater JR

更新日期：1975-05-01 00:00:00

abstract：:The overall anatomy of Neodasys as well as data for hemoglobin-containing cells are described. Hemoglobin-containing cells are shown to be mesodermal specializations constituting approximately 14% of the animal's total body volume (4.87 ± 104 μl). These globular cells (10-14 μm) are situated in two longitudinal rows, ...

journal_title：Journal of morphology

authors： Ruppert EE,Travis PB

更新日期：1983-01-01 00:00:00

abstract：:Five types of hemocytes, prohemocytes, typical plasmatocytes, coagulocytes, spherule cells, and oenocytoides, have been defined in the last larval instar of Heliothis armigera on the basis of ultrastructural microscopy, smears, and optical phase-contrast microscopy. Modifications in typical plasmatocytes and coagulocy...

journal_title：Journal of morphology

authors： Essawy M,Maleville A,Brehélin M

更新日期：1985-12-01 00:00:00

abstract：:Complete postorbital bars, bony arches that encompass the lateral aspect of the eye and form part of a circular orbit, have evolved homoplastically multiple times during mammalian evolution. Numerous functional hypotheses have been advanced for postorbital bars, the most promising being that postorbital bars function ...

journal_title：Journal of morphology

authors： Heesy CP

更新日期：2005-06-01 00:00:00

abstract：:The morphology of the musculature and connective tissues of the arms of Octopus bimaculoides was analyzed with light microscopy. We also studied O. briareus and O. digueti, which possess relatively more elongate and less elongate arms, respectively. The morphology of the arms was found to be remarkably uniform among s...

journal_title：Journal of morphology

authors： Kier WM,Stella MP

更新日期：2007-10-01 00:00:00

abstract：:The skull of the rare bolyeriid snake Casarea dussumieri is described in detail based on high-resolution X-ray CT data. Bolyeriids are unique in their possession of a separate suborbital ossification and a maxilla subdivided into two movably jointed parts, which may be the result of paedomorphic truncation of the deve...

journal_title：Journal of morphology

authors： Maisano JA,Rieppel O

更新日期：2007-05-01 00:00:00

abstract：:The evolution of viviparity alters the physical relationship between mothers and offspring and the prevalence of viviparity among squamate reptiles presents an opportunity to uncover patterns in the evolution of placental structure. Understanding the breadth of this diversity is limited because studies of placental st...

journal_title：Journal of morphology

authors： Stewart JR,Mendez de la Cruz FR

更新日期：2019-01-01 00:00:00

abstract：:Clasper gland morphology and development in Potamotrygon magdalenae and its relation with the acquisition of reproductive maturity is described in males of different developmental stages (embryos, neonates, juveniles, and reproductively active and resting adults). The glands are subcutaneous masses in the proximal bas...

journal_title：Journal of morphology

authors： Anaya-López P,Ramírez-Pinilla MP

更新日期：2017-03-01 00:00:00

abstract：:Whole body studies of Plotosus tandanus revealed that ampullary pores occur over the entire body of the fish, but are in higher concentrations in the head region. These pores give rise to a short canal (50-60 microm) produced by columnar epithelial cells bound together by tight junctions and desmosomes. At the junctio...

journal_title：Journal of morphology

authors： Whitehead DL,Tibbetts IR,Daddow LY

更新日期：2003-02-01 00:00:00

abstract：:Spermatogenesis discontinues during both adult reproductive diapause and quiescence in the flightless males of Omorgus freyi. During both types of dormancy, spermatogenesis discontinuity is a dynamic process involving an uninterrupted supply of primary spermatocytes that undergoes partial development and lyses before ...

journal_title：Journal of morphology

authors： Friedländer M,Scholtz CH

更新日期：1993-12-01 00:00:00

abstract：:Newly metamorphosed Kenyan reed frogs, Hyperolius viridiflavus ferniquei, are able to regenerate amputated digits. The terminal digital pad is also completely reformed. Differentiation of the regenerating digital pad was studied by scanning electron microscopy. External differentiation of the digital pad began late in...

journal_title：Journal of morphology

authors： Richards CM,Carlson BM,Connelly TG,Rogers SL,Ashcraft E

更新日期：1977-09-01 00:00:00

abstract：:Micrabaciids are solitary, exclusively azooxanthellate deep-sea corals belonging to one of the deepest-living (up to 5,000 m) scleractinian representatives. All modern micrabaciid taxa (genera: Letepsammia, Rhombopsammia, Stephanophyllia, Leptopenus) have a porous and often very fragile skeleton consisting of two main...

journal_title：Journal of morphology

authors： Janiszewska K,Stolarski J,Benzerara K,Meibom A,Mazur M,Kitahara MV,Cairns SD

更新日期：2011-02-01 00:00:00

abstract：:The crocodilian naris is regulated by smooth muscle. The morphology of this system was investigated using a combination of gross, light microscopic, and micro-CT analyses, while the mechanics of narial regulation were examined using a combination of Hall Effect sensors, narial manometry, and electromyography. Alligato...

journal_title：Journal of morphology

authors： Klassen M,Adams J,Cramberg M,Knoche L,Young BA

更新日期：2020-06-01 00:00:00

abstract：:The ovarian follicles of Ctenosaura pectinata exhibit a clear seasonal cycle in morphology. Early in development, each oocyte is surrounded by a granulosa composed of a single layer of cuboidal or squamous cells and thin thecal layers. As folliculogenesis progresses, the granulosa becomes multilayered and composed of ...

journal_title：Journal of morphology

authors： Uribe MDCA,B GLP,Guillette LJ Jr

更新日期：1996-10-01 00:00:00

abstract：:Scleractinian corals begin their biomineralization process shortly after larval settlement with the formation of calcium carbonate (CaCO(3)) structures at the interface between the larval tissues and the substrate. The newly settled larvae exert variable degrees of control over this skeleton formation, providing an op...

journal_title：Journal of morphology

authors： Gilis M,Meibom A,Alexander D,Grauby O,Stolarski J,Baronnet A

更新日期：2015-10-01 00:00:00

abstract：:Scanning electron and light microscopic studies reveal significant changes in the endometrial histophysiology of the soft-shelled turtle Lissemys punctata punctata during its seasonal reproductive cycle. Scanning electron microscopy shows the entire oviductal mucosa to be only slightly folded throughout the non-breedi...

journal_title：Journal of morphology

authors： Sarkar S,Sarkar NK,Maiti BR

更新日期：1995-04-01 00:00:00

abstract：:Motor units of the medial gastrocnemius (MG) and the single lateral gastrocnemius/soleus (LG/S) muscles of the opossum (Didelphis virginiana) were found to have uniformly slow contraction times relative to homologous muscles of the cat. Though a broad range of peak tetanic tensions was found among motor units from bot...

journal_title：Journal of morphology

authors： Peters SE,Mulkey R,Rasmussen SA,Goslow GE Jr

更新日期：1984-09-01 00:00:00