Resumen por el autor, George H. Bishop.
Universidad de Wisconsin.La fecundaci6n en la abeja.I. Los organos sexuales masculinos, su estructura histologica y f uncionamiento.Los cambios que tienen lugar en la estructura histol6gica del aparato sexual mesodkrmico en el zhngano reci6n salido del huevo, indican que 10s zhnganos jhvenes no pueden fecundar a las reinas a causa del estado no maduro de dichos 6rganos sexuales durante un periodo de nueve dias por lo menos. Los espermatozoides y el mucus permanecen en la vesicula seminal y el reservorio glandular mucoso, respectivamente, hasta el momento de la eyaculaci6n. Los espermatozoides se insertan por sus cabezas en la pared de la vesicula seminal, cuya Area superficial aumenta a causa de la formacihn de surcos y pliegues alternados que se disponen en espiral alrededor de su cavidad. La cavidad del conducto eyaculador ectodhmico, que se forma por invaginacihn del extremo anterior del pene, no se abre en la de la porcihn mcsodkrmica del aparato hasta que su extremo ciego quitinosorevienta a1 pasar 10s fluidos espermitticos. La musculatura de la base de la glindula mucosa e s t j dispuesta de tal modo que su contracci6n bajo la accibn del estiniulo eyaculador separa esta regi6n basal del reservorio mucoso distal, permitiendo el paso de 10s espermatozoides procedentes de la vesicula seminal a trav k s de la base de la glitndula y desde aqui a1 exterior por el conducto eyaculador. Durante la relajacihn que sigue a la primera contraccihn espasm6dica, el mucus sigue a1 esperma, a causa de la presi6n ejereida por la contracci6n abdominal, de tal modo yue obliga a penetrar a todo el esperma en 10s hrgmos femeninos. Despuds se coagula en contact0 con el aire, cuando el pene se desprende del z6ngano. Varios estimulos artificiales causan una eyaculaci6n normal en apariencia, y 10s mas seguros son la inyeccih de un Acido dkbil en el thrax y la decapitacihn durante la huida. La estructuia de 10s Grganos, naturaleza de 10s liquidos, y funcionamiento dcl aparato bajo la influencia de estimulos artificiales indican un papel diferente de 10s espermatozoides y mucus durante In copulacihn.
EIGHT FIGURESThis work centers about the regeneration of connective tissue of the clerma, after removal of or injury to the superficial layers of the skin. Interest in this problem arose from a previous study (Bishop, '44) in which patches of skin were 153 TlTr 1NIERICAN J O U R N
Louis 10, M i s s o w i SIX FIGURESThe optic path, including the retinal neurone, presumably contains analogues of all those brainstem, thalamic and cortical segments of path that constitute any afferent system. One objective of the following work is t o seek in the optic system a scheme of correlation between anatomical connections and related physiological functions that might apply to those afferent systems which are less fortunately isolated f o r study.A second objective is to apply to the analysis of the optic path in as coordinated a manner as possible both anatomical and physiological criteria; the anatomical data on fiber distribution with respect to diameter, ihe physiological data on conduction rate and electrical threshold as related to size of fiber, and the correlation of different functions with different size groups.The typical afferent pathway has at least two, and possibly three significant components which directly o r indirectly affect the cortex. These are: first, the direct relay path; second, the brainstem collateral path to thalamic "association" nuclei (Starzl and Magoun, '51) : and third, presumably a collateral pathway from the thalamic relay nuclei to other thalamic nuclei (Dempsey, Al orison and Morison, '41 ; Jas-lThis work was supported in part by contract 816 (03) between the Office of Naval
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