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Sperm Banks
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D013074 |
[Centers for acquiring and storing semen.
] |
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Sperm Capacitation
|
D013075 |
[The structural and functional changes by which SPERMATOZOA become capable of oocyte FERTILIZATION. It normally requires exposing the sperm to the female genital tract for a period of time to bring about increased SPERM MOTILITY and the ACROSOME REACTION before fertilization in the FALLOPIAN TUBES can take place.
] |
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Sperm Count
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D013076 |
[A count of SPERM in the ejaculum, expressed as number per milliliter.
] |
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Sperm Head
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D013077 |
[The anterior portion of the spermatozoon (SPERMATOZOA) that contains mainly the nucleus with highly compact CHROMATIN material.
] |
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Sperm Immobilizing Agents
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D013078 |
[Chemical substances with sperm immobilizing activity used as topically administered vaginal contraceptives.
] |
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Sperm Injections, Intracytoplasmic
|
D020554 |
[An assisted fertilization technique consisting of the microinjection of a single viable sperm into an extracted ovum. It is used principally to overcome low sperm count, low sperm motility, inability of sperm to penetrate the egg, or other conditions related to male infertility (INFERTILITY, MALE).
] |
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Sperm Maturation
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D013079 |
[The maturing process of SPERMATOZOA after leaving the testicular SEMINIFEROUS TUBULES. Maturation in SPERM MOTILITY and FERTILITY takes place in the EPIDIDYMIS as the sperm migrate from caput epididymis to cauda epididymis.
] |
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Sperm Midpiece
|
D032961 |
[The middle piece of the spermatozoon is a highly organized segment consisting of MITOCHONDRIA, the outer dense fibers and the core microtubular structure.
] |
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Sperm Motility
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D013081 |
[Movement characteristics of SPERMATOZOA in a fresh specimen. It is measured as the percentage of sperms that are moving, and as the percentage of sperms with productive flagellar motion such as rapid, linear, and forward progression.
] |
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Sperm Retrieval
|
D053625 |
[Procedures to obtain viable sperm from the male reproductive tract, including the TESTES, the EPIDIDYMIS, or the VAS DEFERENS.
] |
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Sperm Tail
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D013082 |
[The posterior filiform portion of the spermatozoon (SPERMATOZOA) that provides sperm motility.
] |
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Sperm Transport
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D013083 |
[Passive or active movement of SPERMATOZOA from the testicular SEMINIFEROUS TUBULES through the male reproductive tract as well as within the female reproductive tract.
] |
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Sperm Whale
|
D050661 |
[The species Physeter catodon (also called Physeter macrocephalus), in the family Physeteridae. The common name is derived from the milky wax substance in its head (spermaceti). The species also produces an intestinal secretion AMBERGRIS, which was previously used in perfumes. The sperm whale is the largest toothed MAMMAL in the world.
] |
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Sperm-Ovum Interactions
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D013084 |
[Interactive processes between the oocyte (OVUM) and the sperm (SPERMATOZOA) including sperm adhesion, ACROSOME REACTION, sperm penetration of the ZONA PELLUCIDA, and events leading to FERTILIZATION.
] |
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Spermatic Cord
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D013085 |
[Either of a pair of tubular structures formed by DUCTUS DEFERENS; ARTERIES; VEINS; LYMPHATIC VESSELS; and nerves. The spermatic cord extends from the deep inguinal ring through the INGUINAL CANAL to the TESTIS in the SCROTUM.
] |
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Spermatic Cord Torsion
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D013086 |
[The twisting of the SPERMATIC CORD due to an anatomical abnormality that left the TESTIS mobile and dangling in the SCROTUM. The initial effect of testicular torsion is obstruction of venous return. Depending on the duration and degree of cord rotation, testicular symptoms range from EDEMA to interrupted arterial flow and testicular pain. If blood flow to testis is absent for 4 to 6 h, SPERMATOGENESIS may be permanently lost.
] |
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Spermatids
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D013087 |
[Male germ cells derived from the haploid secondary SPERMATOCYTES. Without further division, spermatids undergo structural changes and give rise to SPERMATOZOA.
] |
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Spermatocele
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D013088 |
[A cystic dilation of the EPIDIDYMIS, usually in the head portion (caput epididymis). The cyst fluid contains dead SPERMATOZOA and can be easily differentiated from TESTICULAR HYDROCELE and other testicular lesions.
] |
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Spermatocidal Agents
|
D013089 |
[Chemical substances that are destructive to spermatozoa used as topically administered vaginal contraceptives.
] |
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Spermatocytes
|
D013090 |
[Male germ cells derived from SPERMATOGONIA. The euploid primary spermatocytes undergo MEIOSIS and give rise to the haploid secondary spermatocytes which in turn give rise to SPERMATIDS.
] |
