animal pole


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animal pole

n. Embryology
The portion of an egg that is opposite the vegetal pole, that contains the nucleus and most of the cytoplasm, and from which polar bodies are extruded during maturation.

an′imal pole`


n.
the formative part of an ovum, opposite the vegetal pole, that contains the nucleus and most cytoplasm.
[1885–90]
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References in periodicals archive ?
In most animals, the first polar body is formed at the animal pole and subsequently, the second polar body is formed at the vicinity of the first polar body.
3C and Table 2) and cubic in the animal pole, with heights of 22.3 [+ or -] 3.2 [micro]m (Fig.
From the perspective of the animal pole, the 8 cells treated with Zr[O.sub.2] were observed equal cell size of blastomeres (Fig.
Trooper Pearl retrieved an animal pole he keeps in his cruiser - a long pole with a loop at the end used to capture reluctant animals - and climbed into and under the rubble on his hands and knees toward the sounds.
The animal-vegetal axis was established using black ink to visualize the jelly canal located at the animal pole in the jelly coat surrounding the egg.
The cytoplasm migrates to the animal pole where discoidal meroblastic cleavage occurs.
Although early cleavages were unaffected even at high chlorpyrifos concentrations, micromolar concentrations added at the mid-blastula stage evoked a prominent change in cell phenotype and overall larval structure, with appearance of pigmented cells followed by their accumulation in an extralarval cap that was extruded from the animal pole. At higher concentrations (20-40 [micro]M), these abnormal cells constituted over 90% of the total cell number.
In a 1997 essay titled "Siting Vexation Island," the artist cites Gilles Deleuze's topology of naturalist and realist violence in the French philosopher's Cinema 1 The Movement Image (1983).(4) In the latter, Deleuze differentiates between these two concepts, which he refers respectively to "a vegetable or vegetative pole (permeation) and the animal pole (acting out)," and emphasizes the potential for violence that exists in both.(5) Lest one be too hasty in introducing "vegetative violence" as a critical category to decode Graham's film, however, "Siting Vexation Island" indicates that what is also at stake is the engagement with the moving image and, ultimately, with the dynamic relationship between realism and artifice in the medium of film.
The meiotic spindles were located near the animal pole. Peripheral astral microtubules were oriented near the animal pole and spread along the cell cortex (Fig.
However, as the 1st polar body was released, a cap of nonpigmented cytoplasm appeared at the animal pole (Fig.
While blastodisc caps (30-35 [micro]m) formed in the cultures treated with 1.0 and 0.5 [micro]g/ml colchicine, after overnight culture these caps were either lost or reduced to small abnormal shaped discs or sacs of cytoplasm at the animal pole. Normal cleavage and development were never observed in any embryos treated with cytoskeletal inhibitors.