Abstract:
:Electron microscopy of spermatogenesis in the Hawaiian red lobster, Enoplometopus occidentalis (Randall), has revealed unusual activity within membranous organelles. Mitochondria-like bodies (MLB-1) seen first in spermatogonia appear in primary spermatocytes to swell and fuse as the cytoplasm develops annulate lamellae and other membrane complexes. In early spermatids, annulate lamellae derived from the nuclear envelope contribute to development of an extensive lamellar membrane complex within the cytoplasm, the forerunner of the lamellar region. Other mitochondria-like bodies (MLB-2) originate from this membrane complex and contribute to formation of the acrosomal vesicle, which assumes a semicrystalline organization composed of bundles of tubular components slightly larger in diameter than microtubules. An amorphous subacrosomal material may be equivalent to the acrosomal tubule of other decapod spermatozoa. Centrioles at the base of the acrosome produce microtubules that extend between the membranes of the lamellar region distally through the uncondensed nucleus as the cores of the three radial arms of this aflagellate spermatozoon. Nuclear material and electron-dense lamellar region membranes project into the bases of these radial arms. Nuclear and plasma membranes are fused except where the acrosome lies between them. Of the mitochondria-like bodies, the MLB-1 do not persist into spermiogenesis, and the MLB-2 are derived from the lamellar region. This is in contrast with other reported studies of lobster spermatozoon ultrastructure.
journal_name
J Morpholjournal_title
Journal of morphologyauthors
Haley SRdoi
10.1002/jmor.1051900108subject
Has Abstractpub_date
1986-10-01 00:00:00pages
81-92issue
1eissn
0362-2525issn
1097-4687journal_volume
190pub_type
杂志文章abstract::Morphological features of the goldfish caudal neurosecretory system were investigated by means of immunohistochemical localization of urotensins I and II (UI and UII) and electron microscopic examination of the caudal neurosecretory neurons, the urophysis, and the synaptic neuropil. The aim of the work is to provide a...
journal_title:Journal of morphology
pub_type: 杂志文章
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abstract::The external surface of the cornea and adjacent epidermis of larvae in representative developmental stages and of adult frogs, Rana pipiens, was studied by scanning electron microscopy. Surface cells are polygonal, usually hexagonal, in outline and covered with microprojections. During larval development prior to meta...
journal_title:Journal of morphology
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abstract::Shape and age variation in dentition of Paleogene extinct native South American ungulates (Notoungulata) has been traditionally described using qualitative and quantitative approaches, and has played a controversial role in the systematics of several groups. Such is the case of the Notopithecidae, a group of notoungul...
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journal_title:Journal of morphology
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abstract::Descriptions are provided of the histology and ultrastructure of the male internal reproductive tracts from three species of Camponotus, representing three subgenera. This study is the first to provide ultrastructural information on the testes (including spermatogenesis and spermiogenesis), seminal vesicles, and acces...
journal_title:Journal of morphology
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journal_title:Journal of morphology
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更新日期:2000-04-01 00:00:00
abstract::Intercellular bridge development was compared in Ceropia by transmission electron microscopy in the germ cells of males and females. Bridge formation begins in the fourth instar, and the spindle remnants in newly formed bridges are replaced at this time by an amorphous material known as the fusome. In the four- and ei...
journal_title:Journal of morphology
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更新日期:1980-10-01 00:00:00
abstract::The mammary gland is a common site of neoplasms in the female cat. All the malignant tumors metastasize to a lesser or a greater extent through the lymphatic system. However, the anatomical knowledge of this system is not sufficiently well known in cats to develop a reasoned model for the extirpation of these glands i...
journal_title:Journal of morphology
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journal_title:Journal of morphology
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更新日期:2016-05-01 00:00:00
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journal_title:Journal of morphology
pub_type: 杂志文章
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更新日期:2000-12-01 00:00:00
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journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.1051990307
更新日期:1989-03-01 00:00:00
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journal_title:Journal of morphology
pub_type: 杂志文章
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更新日期:1989-06-01 00:00:00
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journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/1097-4687(200009)245:3<206::AID-JMOR3>3.0.
更新日期:2000-09-01 00:00:00
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journal_title:Journal of morphology
pub_type: 杂志文章
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更新日期:2012-06-01 00:00:00
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更新日期:2006-11-01 00:00:00
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journal_title:Journal of morphology
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更新日期:2009-11-01 00:00:00
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journal_title:Journal of morphology
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更新日期:1993-12-01 00:00:00
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journal_title:Journal of morphology
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journal_title:Journal of morphology
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journal_title:Journal of morphology
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journal_title:Journal of morphology
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更新日期:2001-04-01 00:00:00
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journal_title:Journal of morphology
pub_type: 杂志文章
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更新日期:2010-06-01 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
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更新日期:1984-09-01 00:00:00
abstract::The process of coelomic pouch formation in Pisaster ochraceus was studied with light microscopy, transmission and scanning electron microscopy and time-lapse cinemicrography as well as with the drug cytochalasin B. As in most asteroids, the paired coelomic pouches of Pisaster ochraceus are formed from outpocketing of ...
journal_title:Journal of morphology
pub_type: 杂志文章
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更新日期:1978-07-01 00:00:00
abstract::The brine shrimp, Artemia (Crustacea, Anostraca), is a zooplankton that is commonly used in both basic and applied research. Unfortunately, Artemia embryos are often cultured under conditions that alter early development, and reports based on these cultures oversimplify or fail to describe morphological phenotypes. Th...
journal_title:Journal of morphology
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更新日期:2015-03-01 00:00:00
abstract::Neurosecretory (Nsy) cells within the cerebral ganglion of Lumbricus terrestris were classified ultrastructurally. The Nsy cells within the subesophageal ganglion, nerve cord ganglion, and the peripheral nervous system were also examined. A comparative survey of Nsy cells of four other species of oligochaetes, Eisenia...
journal_title:Journal of morphology
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更新日期:1988-07-01 00:00:00
abstract::The three-dimensional structure of the organ of Bellonci in the marine amphipod Gammarus setosus and the relationship between its sensory cells and concretion are described using light, transmission, and scanning electron microscopy, with chemical treatment for cell lysis, calcium chelation, glycogen staining, and lan...
journal_title:Journal of morphology
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更新日期:1984-07-01 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
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abstract::Allografts of skin were observed in Chelydra serpentina. The response to these grafts was modified by a previous transplantation of a limb bud at an early embryonic stage. When the same donor was used for all transplants, the first skin graft was accepted by the host. A second skin graft, however, was rejected at abou...
journal_title:Journal of morphology
pub_type: 杂志文章
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更新日期:1974-12-01 00:00:00