Mastication in the tuatara, Sphenodon punctatus (reptilia: Rhynchocephalia): Structure and activity of the motor system.

abstract：:The micropterygid moth Neomicropteryx nipponensis belongs to the most primitive suborder Zeugloptera of the Lepidoptera. During embryogenesis the small circular germ disk formed on the ventral egg surface invaginates deeply into the yolk. It finally separates from the egg periphery or rudimentary serosa, and becomes a...

journal_title：Journal of morphology

authors： Kobayashi Y,Ando H

更新日期：1981-07-01 00:00:00

abstract：:The vascular system of the digits of the tokay is more complex than has hitherto been suspected and has a configuration which suggests it is intimately involved in the process of adhesion. Distinction can be made between lamellae (expanded scales beneath the proximal portion of the digit) and scansors (elaborations of...

journal_title：Journal of morphology

authors： Russell AP

更新日期：1981-09-01 00:00:00

abstract：:The spinotectal somatosensory projection was compared in normal, genetically eyeless, and embryonically manipulated salamanders. In normal animals, serotonin fluorescence was restricted to the intermediate tectalneuropil. This same region showed both high levels of serotonin uptake and somatosensory single unit electr...

journal_title：Journal of morphology

authors： Gruberg ER,Harris WA

更新日期：1981-10-01 00:00:00

abstract：:Three lineages of cartilaginous fishes have independently evolved filter feeding (Lamniformes: Megachasma and Cetorhinus, Orectolobiformes: Rhincodon, and Mobulidae: Manta and Mobula); and the structure of the branchial filters is different in each group. The filter in Rhincodon typus has been described; species withi...

journal_title：Journal of morphology

authors： Paig-Tran EW,Kleinteich T,Summers AP

更新日期：2013-09-01 00:00:00

abstract：:Several orders of morphologically four-winged insects have evolved mechanisms that enforce a union between the mesothoracic and metathoracic wings (forewings and hindwings) during the wing beat cycle. Such mechanisms result in a morphologically tetrapterous insect flying as if it were functionally dipterous, and these...

journal_title：Journal of morphology

authors： Stocks IC

更新日期：2010-02-01 00:00:00

abstract：:This study reports a comprehensive description of penaeid spermatogenesis (Penaeus monodon) by light and transmission electron microscopy. A conspicuous characteristic of spermatocytogenesis was a ring-like structure with high electron-density adjacent to the nucleus of a primary spermatocyte. During the spermiogenesi...

journal_title：Journal of morphology

authors： Feng T,Paterson B,Johnston SD

更新日期：2017-05-01 00:00:00

abstract：:In Canis and Ursus the largest proportion of attachments of muscles of the shoulder and brachium on the scapula and humerus is direct; fewer attachments are aponeurotic or tendinous. In both genera most attachments can be associated with superficial osteological features (scars or delimitable surfaces); attachments th...

journal_title：Journal of morphology

authors： Bryant HN,Seymour KL

更新日期：1990-10-01 00:00:00

abstract：:The ultrastructure of a well studied insect chemosensory unit is presented in this report. Two separate lumina are present in this chemosensory unit, the trichogen and sensillar lumina. The fluid within the trichogen lumen exclusively bathes the dendritic terminals, and may be involved with the reception and/or modula...

journal_title：Journal of morphology

authors： Felt BT,Vande Berg JS

更新日期：1976-11-01 00:00:00

abstract：:Despite the attention squamate lizards have received in the study of digit and limb loss, little is known about limb morphogenesis in pentadactyl lizards. Recent developmental studies have provided a basis for understanding lizard autopodial element homology based on developmental and comparative anatomy. In addition,...

journal_title：Journal of morphology

authors： Leal F,Tarazona OA,Ramírez-Pinilla MP

更新日期：2010-11-01 00:00:00

abstract：:The female reproductive system of Sphaerodema rusticum consists of a pair of ovaries, two lateral oviducts, a median common oviduct, and a median spermatheca. Accessory glands are absent. Each ovary has five free ovarioles branching from the oviduct. Each ovariole consists of a terminal filament, germarium, vitellariu...

journal_title：Journal of morphology

authors： Jawale SM,Ranade DR

更新日期：1990-08-01 00:00:00

abstract：:The correlation between skin structure and hydrodynamic design of the dorsal fin of the harbor porpoise (Phocoena phocoena) was examined. For the study of fin morphology and geometry, a scheme of sampling representing a two-parameter mesh on the fin surface was used. At each data point the thickness of the epidermis, ...

journal_title：Journal of morphology

authors： Pavlov VV

更新日期：2003-12-01 00:00:00

abstract：:During suction feeding teleost fish have to start mouth opening prior to other expansion movements of the head such as operculo-suspensorium abduction. The distribution of the input force over the various expansion movements is determined by the position of the hyoid in the expansion apparatus. Based on a three-dimens...

journal_title：Journal of morphology

authors： De Visser J,Barel CDN

更新日期：1996-04-01 00:00:00

abstract：:An extremely large number of fifth ceratobranchial teeth, with highly modified, striated, and hooked tips were observed in the central and western Pacific sicydiine goby genus Stiphodon.A scanning electron microscopic study of the form and arrangement of fifth ceratobranchial teeth was conducted to assess the distribu...

journal_title：Journal of morphology

authors： Parenti LR,Thomas KR

更新日期：1998-09-01 00:00:00

abstract：:Larval and juvenile air breathing fish may experience nocturnal and/or seasonal aquatic hypoxia. Yet, whether hypoxia induces respiratory developmental plasticity in larval air breathing fish is uncertain. This study predicted that larvae of two closely related anabantid fish-the facultative air breather the Siamese f...

journal_title：Journal of morphology

authors： Mendez-Sanchez JF,Burggren WW

更新日期：2019-02-01 00:00:00

abstract：:All extant members of Phocoenidae (porpoises) have been characterized as pedomorphic based on skeletal characters. To investigate the ontogenetic background for pedomorphosis and assess interspecific differences in ontogeny among phocoenids, samples of the six extant species were compared in terms of development of bo...

journal_title：Journal of morphology

authors： Galatius A,Berta A,Frandsen MS,Goodall RN

更新日期：2011-02-01 00:00:00

abstract：:The vertebrate head as a major novelty is directly linked to the evolutionary success of the vertebrates. Sequential information on the embryonic pattern of cartilaginous head development are scarce, but important for the understanding of its evolution. In this study, we use the oriental fire bellied toad, Bombina ori...

journal_title：Journal of morphology

authors： Lukas P,Olsson L

更新日期：2020-06-01 00:00:00

abstract：:This descriptive electron microscopic study of the blastogenetic medusa development of Podocoryne carnea focuses on the earliest stages of primordium formation, myogenesis, oogenesis and cnidogenesis. The events which take place at the cellular level prior to the formation of stage 1 (Frey, '68), which are characteriz...

journal_title：Journal of morphology

authors： Boelsterli U

更新日期：1977-11-01 00:00:00

abstract：:The Hawaiian Drosophilidae possess spectacular diversity in male foreleg modifications, many of which are unknown in other Diptera. The greatest diversity in foreleg morphology is in the antopocerus, modified tarsus, and ciliated tarsus clade (AMC Clade), a group of 95 species. The modified tarsus flies are divided in...

journal_title：Journal of morphology

authors： Stark JB,O'Grady PM

更新日期：2010-01-01 00:00:00

abstract：:Liolaemus elongatus (Liolaemidae) is a viviparous, mainly lecithotrophic species with placental structures specialized for uptake of oxygen and inorganic nutrient transport. An allantoplacenta and an omphaloplacenta are present during early embryonic stages (25-28) and there is a moderate distension of the uterine wal...

journal_title：Journal of morphology

authors： Crocco M,Ibarguengoytía NR,Cussac V

更新日期：2008-07-01 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：:To investigate whether the thickness of the cornea in snakes correlates with overall anatomy, habitat or daily activity pattern, we measured corneal thickness using optical coherence tomography scanning in 44 species from 14 families (214 specimens) in the collection at the Natural History Museum (Denmark). Specifical...

journal_title：Journal of morphology

authors： Da Silva MO,Gade JT,Damsgaard C,Wang T,Heegaard S,Bertelsen MF

更新日期：2020-02-01 00:00:00

abstract：:Remarkably preserved specimens of Cowralepis mclachlani Ritchie, 2005 (Proc Linn Soc NSW 126:215-259) (Phyllolepida, Placodermi) represent a unique ontogenetic sequence adding to our understanding of anatomy, function, and phylogeny among basal jawed vertebrates (gnathostomes). A systematic review demonstrates that th...

journal_title：Journal of morphology

authors： Carr RK,Johanson Z,Ritchie A

更新日期：2009-07-01 00:00:00

abstract：:This investigation describes the morphogenesis of the type I pneumocyte from the neonatal stage to the age of 3 months. Cells lining subpleural air spaces were photographed from electron microscopic serial sections and a three-dimensional representation of each cell was obtained by transferring the contours of the cel...

journal_title：Journal of morphology

authors： Mercurio AR,Rhodin JA

更新日期：1984-11-01 00:00:00

abstract：:A comparative study of four genera of arvicolid rodents (Clethrionomys, Eothenomys, Alticola, and Synaptomys) presents the first complete description of limb myology for any member of this recently evolved, highly successful family. The study also identifies four forelimb and four hind-limb muscles that exhibit charac...

journal_title：Journal of morphology

authors： Stein BR

更新日期：1986-03-01 00:00:00

abstract：:The design of minimum-weight structures that retain their integrity under dynamic loading regimes has long challenged engineers. One solution to this problem found in both human and biological design is the optimization of weight and strength by hollowing a structure and replacing its inner core with supportive struts...

journal_title：Journal of morphology

authors： Dean MN,Huber DR,Nance HA

更新日期：2006-10-01 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

abstract：:The neuromuscular control of the hind limb of helmeted guineafowl (Numida meleagris) locomoting on a treadmill at 1.0 m/sec was analyzed using simultaneous electromyography (EMG) and cineradiography. Activity from 16 heads representing 14 hip and knee muscles was recorded and correlated with limb movement and myologic...

journal_title：Journal of morphology

authors： Gatesy SM

更新日期：1999-05-01 00:00:00

abstract：:Ultrastructural studies of spermiogenesis and sperm morphology have found many characters that are likely to provide clues to the phylogeny of the Platyhelminthes. However, the lack of information on many free-living groups has been a limiting factor. There is a single description of the spermatogenesis and spermatozo...

journal_title：Journal of morphology

authors： Ponce de León R,Volonterio O

更新日期：2018-05-01 00:00:00

abstract：:The gonads from three hermaphrodite species of different invertebrate phyla were studied at the ultastructure level. In the flatworm Dugesia biblica, male germ cells in different stages of development lay in the lumen of testicular follicles surrounded by overlapping parietal cells. The intercellular space formed by c...

journal_title：Journal of morphology

authors： O'Donovan P,Abraham M

更新日期：1987-06-01 00:00:00

abstract：:The location and arrangement of the pancreatic endocrine tissue in larval and adult Geotria australis (Geotriidae) differ markedly from those exhibited by the comparable stages of Northern Hemisphere lampreys (Petromyzontidae). In larval Geotria australis, the main zones of islet proliferation are located laterally be...

journal_title：Journal of morphology

authors： Hilliard RW,Epple A,Potter IC

更新日期：1985-06-01 00:00:00