Abstract:
:Light and electron microscopic examination demonstrated two types of non-endocrine agranular cells, cavity boundary cells and stellate cells, in the adenohypophysis of the South American lungfish, Lepidosiren paradoxa. The cavity boundary cells line the hypophyseal cleft and diverticulum and display few microvilli, occasional cilia, prominent junctional complexes, and many cytoplasmic microfilaments. The stellate cells are scattered in the glandular parenchyma and are devoid of microvilli and cilia. When adjacent, they are connected to one another by desmosomes. Pinocytotic vesicles or caveolae are frequently seen along the plasma membrane of the agranular cells adjoining the endocrine cells or abutting on the basement membrane. Possible roles of the agranular cells, physically and metabolically supportive functions, are discussed on the basis of their ultrastractural features.
journal_name
J Morpholjournal_title
Journal of morphologyauthors
Chiba A,Oka S,Honma Y,Ishiyama Mdoi
10.1002/jmor.1052070109subject
Has Abstractpub_date
1991-01-01 00:00:00pages
73-79issue
1eissn
0362-2525issn
1097-4687journal_volume
207pub_type
杂志文章abstract::The ultrastructure of the adenohypophysis (AH) in the larval anadromous sea lamprey, Petromyzon marinus L., was examined. The AH is subdivided into three regions, the pro-, meso-, and meta-AH. Cells of the nasopharyngeal stalk extend directly beneath the pro- and meso-AH to form the ventral surface of the gland. Some ...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.1051760306
更新日期:1983-06-01 00:00:00
abstract::The use of hormone replacement to support limb regeneration in hypophysectomized newts has been the subject of many investigations. Growth hormone, as well as prolactin (PL) in combination with exogenously supplied thyroxine, have all been shown to he effective. However, the bovine growth hormone used to support limb ...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.1051670109
更新日期:1981-01-01 00:00:00
abstract::Astroblepidae or "climbing catfishes" encompass a single genus of species living in high altitude rivers in the Andes of South America. They are characterized by a specialized head morphology closely resembling their better known, widely radiated sister family Loricariidae, or armored suckermouth catfishes. Existent d...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.20169
更新日期:2013-10-01 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
pub_type: 杂志文章
doi:10.1002/jmor.20664
更新日期:2017-05-01 00:00:00
abstract::Many cases of predator-induced morphological plasticity in daphnids are well studied examples of inducible defenses. However, little is known about the early development of these sometimes conspicuous traits. We compared for the first time in five different Daphnia species the embryonic development of predator-induced...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.10270
更新日期:2004-12-01 00:00:00
abstract::A description of the external morphogenesis of male and female embryos of X. ferrugineus, derived from in vivo observation, is presented here. The embryogenesis of this beetle is typical of the Coleoptera, and is also similar in most respects to the generalized insect plan. Observed unusual aspects of X. ferrugineus e...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.1051520205
更新日期:1977-05-01 00:00:00
abstract::The oval olfactory rosette of the carp Labeo rohita belongs to Burne's ('09) rosette column one or to Bateson's (1889) rosette type three. The total olfactory area of the fish is greater than its total retinal area; however, it has been classified with Teichmann's ('54) group of eye-nose fishes. Each olfactory chamber...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.1051400107
更新日期:1973-05-01 00:00:00
abstract::Knowledge of oocyte development and the early differentiation of the germ layers in monotremes stems largely from two articles by J. P. Hill and T. Thomson Flynn. The completeness of their account was due to the large series of echidna ovaries and eggs collected on Tasmania by Flynn, an Australian biologist of whom a ...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.21319
更新日期:2021-01-03 00:00:00
abstract::During epidermal differentiation in mammals, keratins and keratin-associated matrix proteins rich in histidine are synthesized to produce a corneous layer. Little is known about interkeratin proteins in nonmammalian vertebrates, especially in reptiles. Using ultrastructural autoradiography after injection of tritiated...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.10181
更新日期:2004-02-01 00:00:00
abstract::The femoral or cloacal region of many species of lizards and amphisbaenians exhibits epidermal glands. The pores of these glands are plugged with holocrine solid secretions that serve as semiochemical sources. Many authors assume that these glands are mainly associated with reproduction and demarcation of territory. T...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/(SICI)1097-4687(199909)241:3<197::AID-JMOR
更新日期:1999-09-01 00:00:00
abstract::Testicular samples were collected to describe the ultrastructure of spermiogenisis in Alligator mississipiensis (American Alligator). Spermiogenesis commences with an acrosome vesicle forming from Golgi transport vesicles. An acrosome granule forms during vesicle contact with the nucleus, and remains posterior until m...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.10872
更新日期:2010-10-01 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 ultrastructure of five epithelial cellular types is described. (1) Absorptive-storing cells possess a striated border and accumulate lipids and glycogen. They also contain an apical multivesicular complex and numerous membrane-bound PAS-positive granules of unknown significance. (2) Zymogenic cells contain numerou...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.1052020203
更新日期:1989-11-01 00:00:00
abstract::Mengenillidae is a small, basal family of Strepsiptera, mainly characterized by free-living females in contrast to the endoparasitic females of Stylopidia. Here, we describe external and internal structures of the female abdomen of Eoxenos laboulbenei (Mengenillidae). The external morphology was examined and documente...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.20981
更新日期:2019-05-01 00:00:00
abstract::Andean frogs of the genus Telmatobius occur at high elevations, they have an aquatic mode of life and large tadpoles. There are more than 60 species that closely resemble one another and have low values of genetic divergence. However, the skeleton, particularly the cranium, is interspecifically variable with respect t...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.20855
更新日期:2018-09-01 00:00:00
abstract::To elucidate the cellular mechanism underlying the growth of the peritoneal cover of the gut sinus and the heart in the polychaete Arenicola marina, cellular organization of these structures and proliferative potential of their cells were investigated using electron microscopy and electron microscopic autoradiography....
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.10035
更新日期:2002-12-01 00:00:00
abstract::A hitherto unknown sensillum type, the "intracuticular sensillum" was identified on the dactyls of the walking legs of the shore crab, Carcinus maenas. Each sensillum is innervated by two sensory cells with dendrites of "scolopidial" (type I) organization. The ciliary segment of the dendrite is 5-6 μm long and contain...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.1052040311
更新日期:1990-06-01 00:00:00
abstract::The coiled shell of gastropods begins as a cap-shaped lens of organic and calcified material that covers the posterior dorsal side of the larva. During development the cap enlarges to cover the larval visceral mass. Marginal growth then produces the characteristic coiled shell. One model of the initiation of shell coi...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/(SICI)1097-4687(199801)235:1<77::AID-JMOR6
更新日期:1998-01-01 00:00:00
abstract::The dorsal vessel (DV) in the abdomen of the blood-feeding insect Rhodnius prolixus was divided functionally into two regions, the heart, into which haemolymph entered the DV through four pairs of ostia located in abdominal segment VII, and the aorta, along which the haemolymph was propelled from abdominal segment VI ...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.1052040103
更新日期:1990-04-01 00:00:00
abstract::During the long starvation period (November to June) of the lizard (Varanus exanthematicus), pancreatic B cells undergo profound modification. The degeneration of beta granules observed in electron microscopy appears correlated with the diminution of the immunoreactive insulin-like content of the pancreas. The analogy...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.1051800302
更新日期:1984-06-01 00:00:00
abstract::The dorsal fin is one of the most varied swimming structures in Acanthomorpha, the spiny-finned fishes. This fin can be present as a single contiguous structure supported by bony spines and soft lepidotrichia, or it may be divided into an anterior, spiny dorsal fin and a posterior, soft dorsal fin. The freshwater fish...
journal_title:Journal of morphology
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更新日期:2017-12-01 00:00:00
abstract::Studies on birds have led to the hypothesis that increased intestinal absorption between enterocytes (paracellular) evolved as a compensation for smaller intestinal size in fliers, which was perhaps selected to minimize the mass of digesta carried. This hypothesis predicts that bats will also exhibit relatively reduce...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.20324
更新日期:2015-01-01 00:00:00
abstract::Early spermatids of the onychophoran Peripatopsis capensis are spherical cells with a centrally located nucleus, numerous mitochondria, Golgi complexes, microtubules and two centrioles. During spermiogenesis, Golgi vesicles migrate to one side of the cell where they form a tight aggregate, which is later shed. The mat...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.1051590104
更新日期:1979-01-01 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
pub_type: 杂志文章
doi:10.1002/jmor.10875
更新日期:2010-11-01 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::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::Stauromedusae have relatively few macromorphological characters, making both their taxonomy and identification difficult. For this reason, histological characters are also employed in the taxonomy of the group. This study presents a detailed description of the histomorphology of Haliclystus antarcticus Pfeffer, 1889 (...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.20185
更新日期:2013-12-01 00:00:00
abstract::Data from adult birds, crocodilians, Sphenodon, squamates, turtles, and from the chick embryo are compared to test conflicting hypotheses of homology of the deep dorsal thigh muscles of birds and other reptiles. This comparison suggests that: (1) avian Mm. iliofemoralis externus and iliotrochantericus caudalis (herein...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.1051890310
更新日期:1986-09-01 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
pub_type: 杂志文章
doi:10.1002/jmor.21124
更新日期:2020-06-01 00:00:00
abstract::Two different patterns of wing venation are currently supposed to be present in each of the three orders of Paraneoptera. This is unlikely compared with the situation in other insects where only one pattern exists per order. We propose for all Paraneoptera a new and unique interpretation of wing venation pattern, assu...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.11036
更新日期:2012-05-01 00:00:00