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 development, when they reach their maximum abundance and maturity and the production of new ones ceases. Golgi complexes, ribosomes, and excess SER, which are not functional after this stage, become segregated and confined to the posterior portion of the spermatid in a polar lobe. Later, the polar lobe together with excess cytoplasmic matrix is bound by a membrane and dissociated from the spermatid as a residual body. The spermatid is then devoid of Golgi complexes and ribosomes. Formation of residual bodies as sperm cells mature may be considered a type of cell excretion.
journal_name
J Morpholjournal_title
Journal of morphologyauthors
Ugwunna SCdoi
10.1002/jmor.1052030303subject
Has Abstractpub_date
1990-03-01 00:00:00pages
283-92issue
3eissn
0362-2525issn
1097-4687journal_volume
203pub_type
杂志文章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
pub_type: 杂志文章
doi:10.1002/jmor.1052240102
更新日期:1995-04-01 00:00:00
abstract::Several flatfish species exhibit the unusual feature of bilateral asymmetry in prey capture kinematics. One species, Pleuronichthys verticalis, produces lateral flexion of the jaws during prey capture. This raises two questions: 1) How are asymmetrical movements generated, and 2) How could this unusual jaw mechanism h...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.10042
更新日期:2003-04-01 00:00:00
abstract::Barnacle cypris larvae show high morphological variation in the organs used in search of and attaching to a substratum. This variation may represent adaptation to the habitat of the species. Here, we studied SEM level morphologies of cypris antennular sensory and attachment organs in a deep-sea vent endemic species (N...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.20522
更新日期:2016-05-01 00:00:00
abstract::The morphology of ctenostome bryozoans remains little investigated with only few species having been subject to more detailed studies. From all the seven main different superfamilies, only few representatives have been studied. The superfamily Arachnidioidea has particularly been neglected concerning detailed morpholo...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.21275
更新日期:2020-12-01 00:00:00
abstract::The morphology of the spermatozoon of representative species of the subfamily Nesomyinae (Muroidea: Nesomyidae), a monophyletic group of rodents endemic to Madagascar, was examined by light and electron microscopy to determine the sperm head shape and tail length across the species. Marked interspecific differences we...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.10889
更新日期:2010-12-01 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::The mode of sexual reproduction and embryogenesis was compared in 3 species of Botrylloides: B. simodensis, B. lenis, and B. violaceus. In all species, a testis and an egg (occasionally 2 eggs), the former being anterior to the latter, mature in the mantle on either side of a zooid. The egg is surrounded by 2 follicul...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.1051930305
更新日期:1987-09-01 00:00:00
abstract::Sixty-seven specimens of the common North Atlantic asteroid, Asterias vulgaris, were collected at seasonal intervals over a 2-year period and their testes observed with both light and electron microscopy. In the germinal epithelium, a predictable series of interactions between versatile somatic cells and germinal cell...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.1051660107
更新日期:1980-10-01 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
pub_type: 杂志文章
doi:10.1002/(SICI)1097-4687(199905)240:2<127::AID-JMOR
更新日期:1999-05-01 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 cellular populations present in dorsomedial cortex in the snakes Constrictor constrictor, Natrix sipendon and Thamnophis sirtalis are described at the light microscopic level using Nissl and Golgi preparations as well as at the ultrastructural level. This area plays a central role in cortical organization in snake...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.1051610207
更新日期:1979-08-01 00:00:00
abstract::Mites of the genus Veigaia are common gamasid inhabitants of forest litter. They engage in the peculiar reproductive strategy of podospermy which, along with other morphological and behavioral adaptations, involves modification of the chelicerae of the relatively rare males into gonopods. Each movable digit is provide...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.10393
更新日期:2006-02-01 00:00:00
abstract::The results of an ultrastructural investigation of the gastric glands of the ruin lizard are reported. In this reptile the stomach can be divided into a larger fundus and a smaller pars pilorica. Fundic glands are characterized by three main kinds of cells: mucous, endocrine, and oxynticopeptic; the latter were not ob...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/(SICI)1097-4687(200002)243:2<167::AID-JMOR
更新日期:2000-02-01 00:00:00
abstract::The king-of-the-salmon, Trachipterus altivelis (Lampriformes), has an unusual set of oral jaws which allow it the ability to protrude the entire upper jaw, containing the premaxilla and the maxilla bones, to extreme distances. Here, we provide a short description of the cranial anatomy and mechanism of jaw protrusion ...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.21071
更新日期:2019-12-01 00:00:00
abstract::Bats are distributed worldwide from tropical to temperate regions. Despite their wide geographical radiation and advances in studies using evolutionary approaches, aspects related to the reproduction of these animals remain poorly explored, especially those related to the male reproductive accessory glands (RAGs). Thu...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.20767
更新日期:2018-02-01 00:00:00
abstract::Prey capture in Agama stellio was recorded by high-speed video in combination with the electrical activity of both jaw and hyolingual muscles. Quantification of kinematics and muscle activity patterns facilitated their correlation during kinematic phases. Changes in angular velocity of the gape let the strike be subdi...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.1052240306
更新日期:1995-06-01 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
pub_type: 杂志文章
doi:10.1002/jmor.10334
更新日期:2005-06-01 00:00:00
abstract::Fine structural changes in mitochondrial morphology pertaining to size, number and growth were examined in flight muscles of normal and experimentally dewinged male Drosophila melanogaster ranging up to 26 days of age. In the normal winged flies, the number of mitochondria decreases during the first week of adult lif...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.1051450307
更新日期:1975-03-01 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::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
pub_type: 杂志文章
doi:10.1002/jmor.20160
更新日期:2013-09-01 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
pub_type: 杂志文章
doi:10.1002/jmor.20800
更新日期:2018-05-01 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::An ovarian follicle of Drosophila consists of an oocyte, 15 nurse cells, and hundreds of follicular epithelial cells. A freeze-fracture analysis of the surfaces between glutaraldehyde-fixed ovarian cells showed that all three cell types were interconnected by gap junctions. This is the first report of gap junctions be...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.1051850109
更新日期:1985-07-01 00:00:00
abstract::The jaw muscle (i.e., masticatory, suprahyoid, and extrinsic tongue) anatomy and mass were examined in four genera of Old World hamsters (cricetine murids), Mesocricetus, Cricetulus, Tscherskia, and Phodopus. The masseter was the largest and most complicated of the muscles examined. In the superficial layer, a few ven...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.10198
更新日期:2004-04-01 00:00:00
abstract::The study of the ileum of the ant Formica nigricans by light and electron microscopy revealed the existence of three differentiated regions: proximal, middle, and distal ileum. The middle region constitutes most of the length of the organ. Its wall is made up by a folded simple epithelium lined by a cuticle, which is ...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/(SICI)1097-4687(199912)242:3<189::AID-JMOR
更新日期:1999-12-01 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::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::Sipuncula is a clade of unsegmented marine worms that are currently placed among the basal radiation of conspicuously segmented Annelida. Their new location provides a unique opportunity to reinvestigate the evolution and development of segmented body plans. Neural segmentation is clearly evident during ganglionic ven...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.21054
更新日期:2019-11-01 00:00:00
abstract::Feeding mechanics of vertebrates depend on physical constraints of the surrounding media, water or air. Such functions are inseparably combined with form. The aim of this study is to show this linkage for the pleurodiran freshwater turtle Pelusios castaneus and, additionally, to point out the major functional and biom...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/(SICI)1097-4687(200005)244:2<127::AID-JMOR
更新日期:2000-05-01 00:00:00
abstract::The colugos, or flying lemurs (Dermoptera), are arboreal gliding mammals that are commonly grouped with tree-shrews (Scandentia) and Primates in the superorder Euarchonta. However, little is known about the head and neck muscles of these gliding mammals. This raises difficulties for the discussion of not only the func...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.10666
更新日期:2009-01-01 00:00:00