scholarly journals The Origin of the Spermatophoric Mass of the Sand Crab, Hippa pacifica

1956 ◽  
Vol s3-97 (38) ◽  
pp. 257-268
Author(s):  
DONALD C. MATTHEWS
Keyword(s):  
Epithelial Cells ◽  
Cross Section ◽  
Vas Deferens ◽  
Systematic Position ◽  
Mitotic Division ◽  
Homogeneous Matrix ◽  
Basal Foot

1. In Hippa pacifica, mitotic division of germinal epithelial cells produces primary spermatocytes which, as sustentacular-like cells appear, divide meiotically to form spermatids. 2. Concurrently as spermatids metamorphose into spermatozoa, germinal epithelial cells renew their activity and again produce primary spermatocytes which, as they fill the sacculus, expel the spermatozoa. 3. A continuous spermatogenic mass enters the vas deferens, where an enveloping secretion from the epithelial cells bounding the lumen forms a thin sheath to the sperm mass. 4. The lumen (viewed in cross-section) becomes keyhole-shaped and a secretion from a wedge-shaped group of cells bounded by two deep crypts both surrounds the sheathed sperm mass and forms a ribbon-like supporting stalk and a broad, basal foot. 5. As the lumen again becomes circular (in cross-section), a secretion from the epithelial cells surrounds the completed spermatophore and forms the homogeneous matrix. 6. The spermatophore of H. pacifica is both macruran-like, because of its continuous, highly convoluted sperm mass, and anomuran-like, because of its raised spermatophore and broad foot. 7. Neither the anomuran-like spermatophore of a macruran, Parrabicus antarcticus, nor the macruran-like spermatophore of an anomuran, Hippa pacifica, justifies the inference that these two animals occupy a systematic position intermediate between the Macrura and the Anomura, but rather illustrates the need for consideration of many characters before postulating relationships.

A Comparative Study of the Spermatophores of three Scyllarid Lobsters (Parribacus Antarcticus, Scyllarides Squammosus, and Scyllarus Martensii)

1954 ◽  
Vol s3-95 (30) ◽  
pp. 205-215
Author(s):  
DONALD C. MATTHEWS
Keyword(s):  
Epithelial Cells ◽  
Comparative Study ◽  
Systematic Position ◽  
Mitotic Division ◽  
Germinal Epithelium ◽  
Collecting Tubule ◽  
Rhythmical Activity ◽  
Homogeneous Matrix

1. In Parribacus antarcticus and Scyllarus martensii mitotic division of germinal epithelial cells produces primary spermatocytesy whereas in Scyllarides squammosus this function of the germinal epithelium is limited to comparatively few large, oocytelike cells. 2. Metamorphosing spermatids in all three species are expelled from the sacculi of the testis by the rhythmical activity of their germinal epithelium. This probably accounts also for the clumping of the spermatozoa in the collecting tubule; each clump represents the extended contents of a single sacculus. 3. In Scyllarus martensii and Scyllarides squammosus a continuous, cord-like, encapsulated spermatogenic mass traverses the vasa deferentia, whereas in Parribacus antarcticus the spermatogenic mass separates into distinct ampullae which become encapsulated and are further provided with an enveloping sheath. This sheath between adjacent ampullae becomes ribbon-like, twists, and ultimately forms short, doubly twisted peduncles. 4. A secretion of the typhlosole in all three species surrounds the completed spermatophores and forms the homogeneous matrix. 5. Although these three species are anatomically similar, the spermatophores of Scyllarus martensii and Scyllarides squammosus resemble non-pedunculate spermatophores of the palinurids, the astacids, the homarids, and the nephropsids, whereas those of Parribacus antarcticus more nearly resemble the pedunculate spermatophores of certain pagurids. 6. Spermatophoric evidence above does not justify the inference that Parribacus antarcticus occupies a systematic position intermediate between the Macrura and the Anomura.

scholarly journals A Novel Type of Internal Barium Block of a Maxi-K+ Channel from Human Vas Deferens Epithelial Cells

1998 ◽  
Vol 74 (1) ◽  
pp. 199-209 ◽  
Author(s):  
Y. Sohma ◽  
A. Harris ◽  
B.E. Argent ◽  
M.A. Gray
Keyword(s):  
Epithelial Cells ◽  
Vas Deferens ◽  
K Channel ◽  
Barium Block

Maxi K+ channels on human vas deferens epithelial cells

1994 ◽  
Vol 141 (1) ◽  
Author(s):  
Y. Sohma ◽  
A. Harris ◽  
C.J.C. Wardle ◽  
M.A. Gray ◽  
B.E. Argent
Keyword(s):  
Epithelial Cells ◽  
Vas Deferens ◽  
K Channels

scholarly journals Plasticity of basal cells during postnatal development in the rat epididymis

Reproduction ◽  
2013 ◽  
Vol 146 (5) ◽  
pp. 455-469 ◽  
Author(s):  
Winnie W C Shum ◽  
Eric Hill ◽  
Dennis Brown ◽  
Sylvie Breton
Keyword(s):  
Epithelial Cells ◽  
Postnatal Development ◽  
Tight Junctions ◽  
Vas Deferens ◽  
Structural Plasticity ◽  
Basal Cells ◽  
Cytokeratin 5 ◽  
Rat Epididymis ◽  
Immunofluorescence Labeling

Our previous study has shown that basal cells sense luminal factors by forming a narrow body projection that can cross epithelial tight junctions. As a first step toward characterizing the structural plasticity of basal cells, in this study, we followed their appearance and morphology in the rat epididymis and vas deferens (VD) during postnatal development and examined their modulation by androgens in adulthood. Immunofluorescence labeling for cytokeratin 5 showed that basal cells are absent at birth. They progressively appear in a retrograde manner from the VD and cauda epididymis to the initial segments during the postnatal weeks PNW1–3. At the onset of differentiation, basal cells are in contact with the lumen and their nucleus is located at the same level as that of adjacent epithelial cells. Basal cells then position their nucleus to the base of the epithelium, and while some are still in contact with the lumen, others have a ‘dome-shaped’ appearance. At PNW5–6, basal cells form a loose network at the base of the epithelium, and luminal-reaching basal cells are rarely detected. The arrival of spermatozoa during PNW7–8 did not trigger the development of projections in basal cells. However, cells with a narrow luminal-reaching projection began to reappear between PNW8 and PNW12 in the corpus and the cauda. Treatment with flutamide from PNW10 to PNW12 significantly reduced the number of luminal-reaching basal cell projections. In summary, basal cells exhibit significant structural plasticity during differentiation. Fewer apical-reaching projections were detected after flutamide treatment in adulthood, indicating the role of androgens in the luminal-sensing function of basal cells.

scholarly journals Two barium binding sites on a maxi K+ channel from human vas deferens epithelial cells

1996 ◽  
Vol 70 (3) ◽  
pp. 1316-1325 ◽  
Author(s):  
Y. Sohma ◽  
A. Harris ◽  
C.J. Wardle ◽  
B.E. Argent ◽  
M.A. Gray
Keyword(s):  
Epithelial Cells ◽  
Binding Sites ◽  
Vas Deferens ◽  
K Channel

scholarly journals RENEWAL OF CELLS WITHIN TASTE BUDS

1965 ◽  
Vol 27 (2) ◽  
pp. 263-272 ◽  
Author(s):  
Lloyd M. Beidler ◽  
Ronald L. Smallman
Keyword(s):  
Epithelial Cells ◽  
Life Span ◽  
Tritiated Thymidine ◽  
Mitotic Division ◽  
Considerable Change ◽  
Chemical Stimulation ◽  
Taste Bud ◽  
Average Cell ◽  
Daughter Cells ◽  
Rat Tongue

Colchicine blocks mitotic division of the epithelial cells surrounding the taste bud of the rat tongue. Response to chemical stimulation decreases 50 per cent 3 hours after colchicine injection as measured by recording the electrical activity from the taste nerve bundle. Radioautography, using tritiated thymidine, shows that those epithelial cells surrounding the taste bud divide and that some of the daughter cells enter the taste bud and slowly move toward the center. The life span of the average cell is about 250 ± 50 hours, although some cells have a much shorter and others a much longer life span. These studies suggest that the cells within the taste bud, as well as the nerves, undergo considerable change with time. Corresponding changes in function are considered.

Cathorops spixii (Pisces) gill study through Scanning Electron Microscopy

1990 ◽  
Vol 48 (3) ◽  
pp. 708-709
Author(s):  
D. R. Eiras-Stofella ◽  
E. Fanta ◽  
V. L. P. Santos
Keyword(s):  
Epithelial Cells ◽  
Three Dimensional ◽  
Systematic Position ◽  
Chloride Cells ◽  
Muddy Bottom ◽  
Salinity Levels ◽  
Gill Filaments ◽  
South Of Brazil ◽  
The One ◽  
Scanning Electron

The scanning electron microscope is very useful for the detail three-dimensional external understanding of structures, such as fish gills, that present varied aspects according to systematic position or to adaptations to the environment. Cathorops spixii lives near to muddy bottom, in brackish water, and was collected from the Paranaguá bay in the south of Brazil. The 4 gill arches, with 2 hemibranchiae each, have primary gill filaments covered with a corrugated epithelium (Figs. 2 and 4). The epithelial cells are also covered with clear parallel ridges. The secondary or respiratory lamellae are well-developed leaflike structures, which become flatter the father they are from the filament tip. Compared to the primary lamella they are formed by a smooth lininig of epithelial cells, each with concentric ridges. The border between the polygonal cells is clearly visible. Some apical openings of chloride cells can be seen between the cells. All these structures are probably adaptations to the environment where the salinity levels may change, and to the needs of a mucous lining for protection against the environment on the one hand, and an increase of the contact surface of the water and the epithelium on the other.

Volume-sensitive chloride currents in primary cultures of human fetal vas deferens epithelial cells

1996 ◽  
Vol 432 (4) ◽  
pp. 644-654 ◽  
Author(s):  
J. P. Winpenny ◽  
C. J. Mathews ◽  
B. Verdon ◽  
C. J. C. Wardle ◽  
J. A. Chambers ◽  
...  
Keyword(s):  
Epithelial Cells ◽  
Vas Deferens ◽  
Primary Cultures ◽  
Chloride Currents
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