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 diameter), the eyeball is severely malformed, but in most cases it shows evidence of an organized neural retina. Although ganglion cells and an optic nerve head are present in a small proportion of these retinae, we could not trace an optic nerve projection to the brain. These results indicate that some ganglion cells are able to be sustained after the period of naturally occurring cell death, suggesting either that those ganglion cells have established some contact with the central nervous system or that the presence of their axons in a rudimentary optic nerve is adequate for survival. In mild microphthalmia (greater than 5 mm in equatorial diameter), the most consistent abnormality is a defect in the pecten, which together with other abnormalities such as orbital cysts and colobomas indicates that the major abnormality occurs in the region of the choroid fissure. Associated with these defects are abnormalities within the ganglion cell layer. In some cases the number of ganglion cells was reduced, and in others the numbers of both ganglion and displaced amacrine cells were reduced. Unexpectedly, there were localized regions completely devoid of cells in the ganglion cell layer. The timing of the congenital defect may provide some clue as to the presence of a critical period in which displaced amacrine cells are formed or are sensitive to events related to ganglion cell loss.
journal_name
J Morpholjournal_title
Journal of morphologyauthors
Ehrlich D,Stuchbery J,Zappia Jdoi
10.1002/jmor.1051990102subject
Has Abstractpub_date
1989-01-01 00:00:00pages
1-13issue
1eissn
0362-2525issn
1097-4687journal_volume
199pub_type
杂志文章abstract：:The larval epithelium of the sea urchin, Lytechinus pictus, consists of squamous cells and bands of columnar epithelial cells bearing cilia. During metamorphosis this tissue undergoes a series of rapid, complex changes. Through the scanning and transmission electron microscope, we describe and analyse these changes. T...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.1051570103
更新日期：1978-07-01 00:00:00
abstract：:The Norway lobster (Nephrops norvegicus) is economically important in Europe. However, apart from the female reproductive system, very little is known about its internal anatomy. This article focuses on studying the internal anatomy and ultrastructure of the male reproductive system. This system follows the general pa...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.20002
更新日期：2012-06-01 00:00:00
abstract：:Vibrissae or follicle-sinus complexes (F-SCs) are highly developed mammalian sensory structures. These blood-filled sinuses are richly innervated and possess novel mechanoreceptors. Although much is known regarding the function of F-SCs in terrestrial mammals, much less is known regarding marine carnivores such as pin...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.21053
更新日期：2019-11-01 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：:The brain-microvascular architecture of the newt (Triturus cristatus carnifex) was studied by scanning electron-microscopical examination of microvascular corrosion casts. It is characterized at the leptomeningeal level by a superficial network of single vessels that leave the meningeal sheath to form hairpin-shaped c...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.1052100304
更新日期：1991-12-01 00:00:00
abstract：:Four species of Phocidae, or true seals, inhabit the waters surrounding the Antarctic continent. These animals are thought to have different diving capabilities. The Weddell seal, Leptonychotes weddelli, is known to be capable of attaining depths up to 600 meters. The respiratiory system of the Weddell seal shows the ...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.1051470306
更新日期：1975-11-01 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 form and function of the hesperiid feeding apparatus was studied in detail. The butterflies in the family Hesperiidae are of particular interest because the longest proboscis ever recorded in Papilionoidea was found in the Neotropical genus Damas. We focused on the functional morphology by comparing proboscis morp...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.20780
更新日期：2018-03-01 00:00:00
abstract：:Most anatomical and physiological studies of the sauropsid heart have focused on species with extraordinary physiologies, and detailed anatomical descriptions of hearts from sauropsids with more common physiologies are therefore warranted. Here, we present a comprehensive study of the cardiac anatomy of the South Amer...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.10854
更新日期：2010-09-01 00:00:00
abstract：:We provide a detailed description of the larval morphology of the Great Basin spadefoot toad (Scaphiopus intermontanus), a species with documented morphological variability in larval structures associated with feeding. We based our findings on laboratory-raised individuals fed a herbivorous diet. We characterized the ...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.1094
更新日期：2002-05-01 00:00:00
abstract：:Several muroid rodent species are distributed throughout southern Africa. Some species are reportedly classified as opportunistic omnivorous rodents consuming plant, seed, and insect material. This study aims to provide a detailed morphometric analysis of the gastrointestinal tract (GIT) of four such omnivorous specie...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.20856
更新日期：2018-09-01 00:00:00
abstract：:The structure of contact chemoreceptors in the cibariopharyngeal pump of the moth Trichoplusia ni (Lepidoptera: Noctuidae) is described. Two types of receptors designated A and B are located on the floor of the pump. Two groups of 9-12 A receptors are located in the anterior part of the pump, and two groups of two B r...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.1051600103
更新日期：1979-04-01 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
pub_type： 杂志文章
doi：10.1002/jmor.1051500308
更新日期：1976-11-01 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
pub_type： 杂志文章
doi：10.1002/jmor.20647
更新日期：2017-03-01 00:00:00
abstract：:Analysis of lateral and dorsoventral radiographic films shows that ingestion, transport, and mastication in Pedetes capensis (Rodentia) are cyclic and their movement patterns are essentially similar for the three food types offered. During the ingestion cycle, closing of the mouth is accompanied by a backward translat...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.1052050310
更新日期：1990-09-01 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：:Larvae of sea stars are surrounded by an extracellular matrix called the hyaline layer. The lectin-binding properties of this matrix were investigated in an ultrastructural study of Patiriella species having different modes of development. The planktonic bipinnaria and brachiolaria of P. regularis and the planktonic b...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/(SICI)1097-4687(199911)242:2<91::AID-JMOR2
更新日期：1999-11-01 00:00:00
abstract：:Cyprinids constitute the largest fish family and are characterized by their pharyngeal teeth. The masticatory mechanism is still poorly understood. The complex of structures that determine the movements of pharyngeal teeth and chewing pad in the carp (Cyprinus carpio L.) is analyzed. Activities in 16 head muscles of a...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.1051720208
更新日期：1982-05-01 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：:Profiles with all orientations have been used to visualize the 3D structure of ivory from tusks of elephant, mammoth, walrus, hippopotamus, pig (bush, boar, and warthog), sperm whale, killer whale, and narwhal. Polished, forming, fractured, aged, and stained surfaces were prepared for microscopy using epi-illumination...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.10585
更新日期：2008-04-01 00:00:00
abstract：:The egg tooth of squamates evolved to facilitate hatching from mineralized eggshells. Squamate reptiles can assist their hatching with a single unpaired egg tooth (unidentates) or double egg teeth (geckos and dibamids). Egg tooth ontogeny in two gekkotan species, the leopard gecko Eublepharis macularius and the mourni...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.21249
更新日期：2020-10-01 00:00:00
abstract：:The segmental anatomy of Harmothoë imbricata deviates from the plan of a typical errant polychaete only slightly. The body is partitioned into 37 nonmetameric segments and is covered by 15 pairs of elytra. The segmental musculature consists of paired dorsal and ventral longitudinal muscles, pairs of dorso-ventral musc...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.1051350302
更新日期：1971-11-01 00:00:00
abstract：:Fourteen species of leiognathid fishes (Perciformes, Leiognathidae) from the Philippine Islands, Thailand, Japan, Indonesia, and Palau were examined for accessory secondary sexual dimorphism. Thirteen species exhibit either external dimorphism (a clear patch of skin on the flanks of males, a large clear patch of skin ...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.1051820105
更新日期：1984-10-01 00:00:00
abstract：:Sensory epithelia of the oral tube, a fungiform body anterior to the tentacles and of the terminal knob of tentacles, were studied in Ovatella myosotis by electron microscopy. All three epithelia consist of columnar support cells, sensory cells, and, except in the oral tube, numerous goblet cells. The epithelia differ...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.1051810307
更新日期：1984-09-01 00:00:00
abstract：:Correlative studies of luminescent responses, light and electron microscopy of Porichthys photophores during development were conducted. The photophores differentiate as an outgrowth of the basal cell layer of the epidermis, from which they delaminate into the dermis. Reflector cells are formed from dermal fibroblasts...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.1051510305
更新日期：1977-03-01 00:00:00
abstract：:Morphology is strongly correlated with trophic mode in marine invertebrate larvae. We asked if larval morphogenesis is influenced by adelphophagy, a trophic mode in which larvae are provisioned with additional yolk in the form of extra-embryonic nurse eggs, instead of the more common increase in egg size. We used hist...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.20071
更新日期：2013-01-01 00:00:00
abstract：:The recent discovery of a plethodontid salamander, Karsenia koreana, in Korea challenged our understanding of the biogeographic history of the family Plethodontidae, by far the largest family of salamanders, which otherwise is distributed in the New World with a few European species. Molecular studies suggest that Kar...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.10816
更新日期：2010-05-01 00:00:00
abstract：:The hypotheses of relationships within Lari (gulls) are highly unstable, and depend on whether morphological or molecular data are examined. Developmental sequence data are thought to contain phylogenetic information, but have never been applied to the problem of avian systematics. In this article, we describe the oss...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.10633
更新日期：2008-09-01 00:00:00
abstract：:The structure, attachment and subsequent metamorphosis of larvae of the marine bryozoan Bugula neritina were studied by light and electron microscopy. Two points of larval anatomy are of special significance to proper interpretation of the metamorphosis: 1 Two cytologically similar blastemal tissues, each laden with f...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.1051340307
更新日期：1971-07-01 00:00:00
abstract：:The tubular accessory gland consists of a simple secretory epithelium surrounded by a muscular coat. Over the pupal instar, the gland increases ten-fold in volume and 15-fold in length. Pupal development is divisible into a phase of mitosis and one of cell growth. During the mitotic phase, cytoplasmic membranes are sp...
journal_title：Journal of morphology
pub_type： 杂志文章
doi：10.1002/jmor.1051720109
更新日期：1982-04-01 00:00:00
