NCBI Bookshelf. Molecular Biology of the Cell. New York: Garland Science; In most species, there are just two types of gamete , and they are radically different.
Sperm - Wikipedia
The quality of spermatozoa has a direct influence on the fertilization and developmental competence of embryos. The aim of this work was to review the methods of spermatozoa morphology assessment, features of the normal spermatozoa and the reasons of their several abnormalities. Three methods can be used for the evaluation of spermatozoa morphology in the in vitro fertilization IVF laboratory: 1 light microscopy of stained spermatozoa, 2 motile sperm organelle morphology examination MSOME and 3 polarized light microscopy. The analysis of spermatozoa morphology includes the assessment of head, neck, midpiece and tail. Before IVF and intracytoplasmic sperm injection ICSI , the quality of spermatozoa must be estimated exactly, because this has the high influence on embryo development. Therefore the analysis of the morphological parameters of spermatozoa using the light microscopy, MSOME, in combination with precise head birefringence detection using the polarized microscopy, could give the best fertilization rate and embryo quality after IVF and ICSI. Spermatozoa - Facts and Perspectives.
Assessment of Human Sperm Cells Morphological Parameters
A spermatozoon joins an ovum to form a zygote. A zygote is a single cell, with a complete set of chromosomes , that normally develops into an embryo. Sperm cells contribute approximately half of the nuclear genetic information to the diploid offspring excluding, in most cases, mitochondrial DNA.
Advances in Assisted Reproductive Technologies pp Cite as. Mammalian spermatozoa possess a unique topography which clearly defines the location of the various organelles responsible for the diverse functions the sperm cell must fulfill, before and during fertilization. A technique of in depth evaluation of sperm morphology might afford a wide spectrum of information, ranging from data concerning the integrity of the spermatogenetic process of the testes to the functional properties of the spermatozoa.