Abstract：
:It is well established that the capacity for teeth to differentiate "in vitro" depends upon: a) the age of the embryonic rudiments at the time of excision and b) the number of cells within each tissue type which are capable of differentiating into organ culture. This paper studies ultrastructural aspects of tooth buds grown in vitro from lizard embryos and compares these characteristics with those observed in dental germs grown in situ in older lizard embryos. Moreover, we report the self-differentiation in vitro dental tissues from adult lizard and compare this phenomenon with the main features of a morphogenetic field. Our results suggest that approximately in the first third of gestation in L. gravenhorsti the dental buds has already acquired the capacity for self-differentiation in vitro. The ultrastructural observations show that there are no significant differences between odontoblasts and ameloblasts in situ and in vitro. The tooth from "adult lizards," isolated by combined microsurgical and enzymatic procedure and cultured in semisolid-liquid medium were also able to differentiate teeth. This phenomenon implies that self-differentiation is not rigidly determined, and that in these animals the tooth tissues represents a continuous morphogenetic field throughout the animal's life. This property is intrinsic, resides in the isolated tooth tissues, and is relatively independent of external factors. In addition, these studies indicate that the chick chorio-allantoic membrane and the semisolid-liquid culture medium supply the majority of the factors required for development of these tissues.
journal_name
J Morpholjournal_title
Journal of morphologyauthors
Lemus D,Paz de la Vega Y,Fuenzalida M,Illanes Jdoi
10.1002/jmor.1051650302subject
Has Abstractpub_date
1980-09-01 00:00:00pages
225-36issue
3eissn
0362-2525issn
1097-4687journal_volume
165pub_type
杂志文章abstract：:The functioning of the vertebrate eye depends on its absolute size, which is presumably adapted to specific needs. Eye size variation in lidless and spectacled colubrid snakes was investigated, including 839 specimens belonging to 49 genera, 66 species and subspecies. Variations of adult eye diameters (EDs) in both ab...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.20028
更新日期：2012-08-01 00:00:00
abstract：:Anseriform birds were surveyed to examine how the degree of postcranial pneumaticity varies in a behaviorally and size-diverse clade of living birds. This study attempts to extricate the relative effects of phylogeny, body size, and behavioral specializations (e.g., diving, soaring) that have been postulated to influe...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.10190
更新日期：2004-08-01 00:00:00
abstract：:The fiber constituents and connections of the calyces - the input-receiving regions - of the corpora pedunculata ("mushroom bodies") were studied in reduced silver preparations from the American cockroach, Periplaneta americana (L.). In the outer synaptic layer of the calyces five fiber classes were distinguished, the...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.1051420103
更新日期：1974-01-01 00:00:00
abstract：:To date, the phylum Cycliophora comprises only one described extant species of acoelomate marine invertebrates, Symbion pandora. Adult specimens live commensally on the mouthparts of the Norwegian lobster, Nephrops norvegicus. Its complicated life cycle includes an asexually produced Pandora larva and a sexually produ...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.10354
更新日期：2005-08-01 00:00:00
abstract：:The cytoarchitecture of nuclei in the preoptic area, ventral thalamus, dorsal thalamus, epithalamus, hypothalamus, posterior tuberculum, synencephalon, and pretectum and the accessory optic nuclei was analyzed in a perciform teleost, the sea bass Dicentrarchus labrax, by using serial sections stained with cresyl-viole...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/1097-4687(200103)247:3<229::AID-JMOR1014>3
更新日期：2001-03-01 00:00:00
abstract：:The embryonic development of the viviparous scorpion, Heterometrus fulvipes, has been followed throughout the gestation period and the successive stages of the developing embryos have been examined. The morphological features of the embryos are also described and illustrated according to their approximate age. ...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.1051690303
更新日期：1981-09-01 00:00:00
abstract：:The olfactory epithelium and the vomeronasal organ of the Japanese striped snake were examined by lectin histochemistry. Of the 21 lectins used in the study, all lectins except succinylated-wheat germ agglutinin (s-WGA) showed similar binding patterns in the vomeronasal receptor cells and the olfactory receptor cells ...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.10864
更新日期：2010-10-01 00:00:00
abstract：:Studies of echinoid microscopic anatomy over the last two centuries have created a number of inaccuracies and mistakes that have accumulated in the descriptions of the intricate organization of the coelomic system of Echinoidea. To clarify the situation, we reconstructed the axial complex and radial complex of the ech...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.20811
更新日期：2018-06-01 00:00:00
abstract：:The function of the septomaxilla of nonmammalian synapsids has long been problematic. Distinctive features of this bone, including a prominent intranarial process and a septomaxillary canal and foramen, are characteristic of pelycosaurs and nonmammalian therapsids, but are lost in their mammalian descendants. Numerous...
journal_title：Journal of morphology
pub_type： 杂志文章,评审
doi：10.1002/1097-4687(200007)245:1<29::AID-JMOR3>3.0.C
更新日期：2000-07-01 00:00:00
abstract：:The penises of bats are taxonomically distinctive in size and shape. In addition, they are variable in microscopic anatomy, indicating that histomorphological studies of copulatory organs of bats may help understanding their successful reproductive strategies. We studied adult males of 13 species of vespertilionid and...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.21062
更新日期：2019-12-01 00:00:00
abstract：:The posterior half of the channel catfish intestine has a similar histological organization to that of other teleost fishes. This region is organized into a muscosa, a submucosa, a double layered muscularis and a serosa. A "stratum compactum" of dense connective tissue was confirmed for the submucosa. In its histology...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.1051450405
更新日期：1975-04-01 00:00:00
abstract：:Swimming crabs of the taxon Portunoidea show specialized, paddle-shaped fifth pereiopods (P5), which play a role in these crabs' ability to swim. In this study, the morphology of the fifth pereiopod in swimming and non-swimming crabs was studied in detail and the mobility in the articulations between podomeres was cal...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.21268
更新日期：2020-12-01 00:00:00
abstract：:The muscles of the head, neck and thorax of the adult cabbage looper Trichoplusia ni are described for the first time. They are compared to those of Choristoneura fumiferana, Manduca sexta, Smerinthus geminatus, Antheraea polyphemus, Sphinx convolvuli, Crymodes devastator, and Danaus plexippus. ...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.1051390204
更新日期：1973-02-01 00:00:00
abstract：:The extracellular matrices (ECMs) surrounding the benthic embryos and larvae of the seastar Patiriella exigua and the planktonic embryos of Patiriella regularis were examined by transmission and scanning electron microscopy. Three ECMs surround unhatched embryos: An outer jelly coat, a fertilization envelope, and an i...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.1052250107
更新日期：1995-07-01 00:00:00
abstract：:Tadpoles of several different genera were fed graded suspensions of uniform polystyrene particles to determine the lower size limit of particles that could be ingested. Certain tadpoles can extract suspended particles as small as 0.126 μ in diameter from the water. In terms of particle size, this is an efficiency comp...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.1051370303
更新日期：1972-07-01 00:00:00
abstract：:The differences in angulation and length observed for the fibers of anatomical muscles may reflect two distinct mechanical requirements: arrangement for pinnation, reflecting an increase in physiological cross-section and arrangement for equivalent placement of sarcomeres, possibly associated with coordination. The ob...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.1051920106
更新日期：1987-04-01 00:00:00
abstract：:The Antarctic snailfish Paraliparis devriesi (Liparididae) occupies an epibenthic habitat at a depth of 500-650 m in the subzero waters of McMurdo Sound, Antarctica. Although lacking a swim bladder, this species is neutrally buoyant through the combined effects of reduced skeletal ossification and expansion of a water...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.1052200108
更新日期：1994-04-01 00:00:00
abstract：:The fine structural characteristics of epithelial cells of the anal vesicle in the hymenopteran parasitoid, Microplitis croceipes (Cresson), are similar to those of transport cells. Apical and basal infoldings, an abundance of mitochondria, ribosomes, rough endoplasmic reticulum, Golgi complexes and pinocytotic vesicl...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.1051540205
更新日期：1977-11-01 00:00:00
abstract：:This study examines the morphology of sporadic congenital microphthalmia in 1-day-old chicks, with particular emphasis on the neural retina. On the basis of the size of the eyeball it is possible to classify microphthalmia into two groups, severe and mild. In severe microphthalmia (less than 5 mm in equatorial diamete...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.1051990102
更新日期：1989-01-01 00:00:00
abstract：:For the first time the scanning electron microscope was used to compare developmental changes in scorpion embryos and the first and second stadia. In the buthid species of this study, Centruroides vittatus, and all other scorpions, the newborn climb up on their mother's back and remain there without feeding for severa...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.10227
更新日期：2005-07-01 00:00:00
abstract：:The orbital Harderian gland of the common tree shrew (Tupaia glis) was investigated at the macroscopic and microscopic levels. In the glands of both sexes only one acinar cell type was found. The cell is characterized by the presence of numerous lipid vacuoles of variable size and by a small number of PAS-positive, el...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.10066
更新日期：2003-03-01 00:00:00
abstract：:We investigated if and how the inner ear region undergoes similar adaptations in small, fossorial, insectivoran-grade mammals, and found a variety of inner ear phenotypes. In our sample, afrotherian moles (Chrysochloridae) and the marsupial Notoryctes differ from most other burrowing mammals in their relatively short ...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.20391
更新日期：2015-08-01 00:00:00
abstract：:The objectives of this research were to investigate the morphology of the thoracic skeleton and muscles of the mosquito, Culiseta inornata (Williston). The results are presented in 25 text figures and descriptions of each skeletal part and muscle. Undescribed exoskeletal structures are the postmediotergite, intersegme...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.1051530308
更新日期：1977-09-01 00:00:00
abstract：:Cubozoans have a complex lifecycle in many ways similar to the scyphozoan lifecycle. The sexual reproduction within cubozoans varies between species with one clade having copulation and internal fertilization and the release of planula larvae. This cubozoan clade, the family Tripedaliidae, includes three species, Copu...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.21046
更新日期：2019-10-01 00:00:00
abstract：:Non-innervated macrotrichia and microtrichia, thick-walled chemoreceptors and three kinds of thin-walled chemoreceptors are present on the antennal flagellum of Frenesia missa. One of the thin-walled receptors, the plate organ, is of a type not previously recorded for any insect. About four times as many plate organs ...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.1051350309
更新日期：1971-11-01 00:00:00
abstract：:Homolid crabs (Hypsophrys) from water deeper than 700 m in the Straits of Florida and Arabian Sea have smooth darkened oval spots contrasting with the surrounding roughened integument on inner and outer surfaces of each pincer at the base of the fixed finger. Cuticle is thinner over these spots than over surrounaing t...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.1051500407
更新日期：1976-12-01 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
pub_type： 杂志文章
doi：10.1002/jmor.1051540206
更新日期：1977-11-01 00:00:00
abstract：:According to the current opinion, lymph-heart striated muscle represents a specialized type of skeletal muscles in frogs. Here, we studied muscle fibers in mechanically damaged lymph hearts during the first postoperative week using electron-microscopic autoradiography. We present evidence that both, the satellite cell...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.20476
更新日期：2015-12-01 00:00:00
abstract：:Iridescent butterfly scales are structurally colored, relying upon the interaction of light with detailed architecture to produce their color. In some iridescent scales, the reflective elements are contained within the body of the scale and come in two basic forms, lattices that produce diffraction colors (analogous t...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.1052020106
更新日期：1989-10-01 00:00:00
abstract：:Ventral bars, cartilaginous projections from the ventral aspect of the synsacrum that contact and form a joint with the ilium, were found in all normal chick embryos of age E9 and older. Bars were absent in a number of embryos which had been paralyzed from age E4 by the use of the acetylcholine receptor blocker alpha-...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.1051730205
更新日期：1982-08-01 00:00:00
