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This atlas provides ultrastructural morphological images of human spermatozoa. Sperm morphology plays an essential role in sperm-oocyte interactions and early embryonic development, and human sperm ultrastructural morphology offers a valuable reference tool for assessing certain etiologies of male infertility and reproductive failure. However, the ultrastructural morphology of human sperm has not been systematically evaluated or thoroughly described in the literature. Using 470 original and unpublished images, the book shows various ultrastructural morphological phenotypes; defects of the sperm head, neck, middle piece, principal piece, and terminal piece; as well as artifacts of sperm ultrastructural morphology and phenomena related to inadequate preparation, demonstrating several sperm phenotypes and surface structural appearances for the first time. As such, it helps researchers and practitioners in andrology, reproductive medicine, and reproductive pathology gain a better understanding of human sperm ultrastructural morphology.

Human physiology. --- Andrology. --- Microscopy. --- Human Physiology. --- Biological Microscopy. --- Analysis, Microscopic --- Light microscopy --- Micrographic analysis --- Microscope and microscopy --- Microscopic analysis --- Optical microscopy --- Optics --- Generative organs, Male --- Human reproduction --- Men --- Human biology --- Medical sciences --- Physiology --- Human body --- Endocrine aspects --- Diseases --- Espermatozoides --- Semen --- Morfologia (Biologia) --- Estructura biològica --- Estructura en biología --- Forma biològica --- Morfologia comparada --- Anatomia comparada --- Homologia (Biologia) --- Malformacions --- Morfologia animal --- Morfologia vegetal --- Morfogènesi --- Humors corporals --- Espermatozous --- Gàmetes masculins --- Cèl·lules germinals --- Espermatogènesi --- Testicle