Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/101662
Type: Artigo de periódico
Title: Ultrastructural Analysis Of Spermiogenesis In Iguana Iguana (reptilia: Sauria: Iguanidae)
Author: Ferreira A.
Dolder H.
Abstract: Spermiogenesis in the lizard, Iguana iguana, was studied by transmission and scanning electron microscopy. During this process, structures such as the acrosomal complex in the spermatid head and the axonemal complex in the mid and principal pieces of the flagellum are formed. The nuclear content is initially compacted into thick, longitudinal chromatin filaments. Nuclear shape is determined by further compaction and by the manchette, a layer of microtubules surrounding the head. The acrosomal complex originates from Golgi vesicles and the interaction between the proacrosomal vesicle and the nucleus. The midpiece consists of a pair of centrioles, Surrounded by a fibrous sheath and rings of simple and modified mitochondria. The centrioles sustain the axoneme that appears at the end of the midpiece. The axoneme extends throughout the principal piece of the flagellum with the 9 + 2 pattern, still surrounded by the fibrous sheath. In the endpiece, the axoneme continues, surrounded only by the plasma membrane. In the lumen of seminiferous tubules, immature spermatozoa retain abundant residual cytoplasm.
Editor: 
Rights: fechado
Identifier DOI: 10.1076/ejom.40.2.89.15452
Address: http://www.scopus.com/inward/record.url?eid=2-s2.0-0038348182&partnerID=40&md5=35eade78419b5c691b903eac6da4e4fd
Date Issue: 2002
Appears in Collections:Unicamp - Artigos e Outros Documentos

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