Journal of Morphology
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Reproduction in the mexican leaf frog, Pachymedusa dacnicolor. IV. Spermatogenesis: A light and ultrasonic studyAbstract Primary spermatogonia have highly lobate nuclei and can be distinguished as pale and dark types on the basis of nuclear and cytoplasmic features. Nuclei of secondary spermatogonia are also lobate. Primary spermatocytes have spherical nuclei and display synaptinemal complexes in late zygotene‐pachytene. Spermatocytes are connected by intercellular bridges, w... ... hiện toàn bộ
Journal of Morphology - Tập 197 Số 3 - Trang 277-302 - 1988
Spermiogenesis in Odontophrynus cultripes (Amphibia, Anura, Leptodactylidae): Ultrastructural and cytochemical studies of proteins using E‐PTAAbstract Spermiogenesis in the South American leptodactylid frog Odontophrynus cultripes was analyzed ultrastructurally. The spermatids undergo morphological modification while still enclosed in microtubule‐rich processes of Sertoli cells. Electron‐dense plates resembling junctional structures appear in regions at which the spermatids lie ... ... hiện toàn bộ
Journal of Morphology - Tập 207 Số 3 - Trang 303-314 - 1991
The pectoral appendages of Prionotus and their innervation
Journal of Morphology - Tập 11 Số 1 - Trang 177-192 - 1895
Myelin movements in mature mammalian peripheral nerve fibersAbstract Mature mouse and cat peripheral nerve fibers have been examined in vitro by time‐lapse photography. Some Schmidt‐Lanterman clefts which were open at the start closed later; other were seen to open and then to close, some of them more than once. The implications of these movements are considered, especially in regard to the question of the passage of materia... ... hiện toàn bộ
Journal of Morphology - Tập 143 Số 2 - Trang 167-185 - 1974
The growth, maturation and atresia of ovarian eggs in the rabbitAbstract A study is made of the development of ovarian ova in mature rabbit does before and during various stages of pregnancy and after the injection of thyroid and anterior‐pituitary‐like hormones. No appreciable ovogenesis during sexual maturity was found. Nine types of ovarian follicle are distinguished according to size and degree of development. Full ovum size... ... hiện toàn bộ
Journal of Morphology - Tập 61 Số 2 - Trang 351-383 - 1937
Oogenesis in Xenopus laevis (Daudin). V. Relationships between developing oocytes and their investing follicular tissuesAbstract The relationship of the cells and tissues which comprise the developing ovarian follicle in Xenopus laevis has been studied with scanning and transmission electron microscopy. The saclike ovary is covered on its coelomic side by a squamous epithelium. The cells of this epithelium are extensively interdigitated, and each bears a sh... ... hiện toàn bộ
Journal of Morphology - Tập 155 Số 1 - Trang 73-97 - 1978
The development of acellularity of the vertebral bone of the Japanese medaka, Oryzias latipes (Teleostei; Cyprinidontidae)Abstract Among vertebrates, some teleosts are unique in having bone which lacks osteocytes embedded in the matrix. The fate of cells that secrete the matrix of these acellular bones has not been investigated thoroughly. Histological and fluorescent microscopic analysis of the vertebral bone of Oryzias latipes demonstrated that acellularity... ... hiện toàn bộ
Journal of Morphology - Tập 193 Số 3 - Trang 253-261 - 1987
Vertebral column and associated elements in dipnoans and comparison with other fishes: Development and homologyAbstract A vertebral column consisting of a persistent notochord and ossified arcocentra is the primitive condition for Gnathostomata; it still persists in primitive actinopterygians and sarcopterygians. Advanced actinopterygians and sarcopterygians develop numerous types of centra that include, among others, the presence of holocentrum, chordacentrum, and autocentr... ... hiện toàn bộ
Journal of Morphology - Tập 250 Số 2 - Trang 101-172 - 2001
Features of mono‐ and multinucleated bone resorbing cells of the zebrafish Danio rerio and their contribution to skeletal development, remodeling, and growthAbstract To provide basic data about bone resorbing cells in the skeleton during the life cycle of Danio rerio , larvae, juveniles, and adults (divided into six age groups) were studied by histological procedures and by demonstration of the osteoclast marker enzyme tartrate‐resistant acid phosphatase (TRAP). Special attention was paid to th... ... hiện toàn bộ
Journal of Morphology - Tập 250 Số 3 - Trang 197-207 - 2001
Dry under water: Comparative morphology and functional aspects of air‐retaining insect surfacesAbstract Superhydrophobic surfaces prevent certain body parts of semiaquatic and aquatic insects from getting wet while submerged in water. The air layer on these surfaces can serve the insects as a physical gill. Using scanning electron microscopy, we investigated the morphology of air‐retaining surfaces in five insect species with different levels of adaptation to... ... hiện toàn bộ
Journal of Morphology - Tập 272 Số 4 - Trang 442-451 - 2011
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