|Medical Dictionary - Dictionary of Medicine and Human Biology|
Cytocentrum with astral rays in the cytoplasm of an inseminated ovum; it is brought in by the penetrating spermatozoon and evolves into the mitotic spindle of the first cleavage division. [sperm + G. aster, a star (aster)]
Relating to the sperm or semen.
A cell in a late stage of the development of the spermatozoon; it is a haploid cell derived from the secondary spermatocyte and evolves by spermiogenesis into a spermatozoon. SYN: nematoblast. [spermat- + -id (2)]
Name proposed for an albuminoid in the seminal fluid.
SYN: spermatogonium. [spermato- + G. blastos, germ]
Cyst of the epididymis containing spermatozoa. SYN: spermatocyst. [spermato- + G. kele, tumor]
Destructive to spermatozoa. SYN: spermicidal.
An agent destructive to spermatozoa. SYN: spermicide. [spermato- + L. caedo, to kill]
Relating to spermatocytes.
Parent cell of a spermatid, derived by mitotic division from a spermatogonium. [spermato- + G. kytos, cell] primary s. the s. derived by a growth phase from a spermatogonium, and that undergoes the first division of meiosis. secondary s. the s. derived from a primary s. by the first meiotic division; each secondary s. produces two spermatids by the second meiotic division.
The entire process by which spermatogonial stem cells divide and differentiate into spermatozoa. SEE ALSO: spermiogenesis. SYN: spermatocytogenesis, spermatogeny. [spermato- + G. genesis, origin]
Relating to spermatogenesis; sperm-producing. SYN: spermatogenetic, spermatogenous, spermatopoietic (1) .
The primitive sperm cell derived by mitotic division from the germ cell; increasing several times in size, it becomes a primary spermatocyte. SEE ALSO: spermatid. SYN: spermatoblast, spermatogone. [spermato- + G. gone, generation]
1. Resembling a sperm, a sperm tail, or semen. 2. A male or flagellated form of the malarial microparasite. [spermato + G. eidos, form]
The branch of histology, physiology, and embryology concerned with sperm and/or seminal secretion. [spermato- + G. logos, study]
A specific lysin (antibody) formed in response to the repeated injection of spermatozoa.
Destruction, with dissolution, of the spermatozoa. SYN: spermolysis. [spermato- + G. lysis, dissolution]
Relating to spermatolysis.
Morbid fear of spermatorrhea or loss of semen. [spermato- + G. phobos, fear]
A capsule containing spermatozoa; found in a number of invertebrates. [spermato- + G. phoros, bearing]
1. SYN: spermatogenic. 2. Secreting semen. [spermato- + G. poieo, to make]
An involuntary discharge of semen, without orgasm. [spermato- + G. rhoia, a flow]
A cytotoxic antibody specific for spermatozoa. SYN: spermotoxin.
Plural of spermatozoon.
spermatozoal, spermatozoan (sper′ma-to-zo′al, -zo′an)
Relating to spermatozoa.
spermatozoon, pl .spermatozoa (sper′ma-to-zo′on, -zo′a)
The male gamete or sex cell that contains the genetic information to be transmitted by the male, exhibits autokinesia, and is able to effect zygosis with an ovum. The human s. is composed of a head and a tail, the tail being divisible into a neck, a middle piece, a principal piece, and an end piece; the head, 4–6 μm in length, is a broadly oval, flattened body containing the nucleus; the tail is about 55 μm in length. SYN: sperm cell, sperm. [G. sperma, seed, + zoon, animal]
Plural of spermium.
A polyamine found with spermine in a wide variety of organisms and tissues; found in human sperm; important in cell and tissue growth.
1. SYN: ductus deferens. 2. SYN: ejaculatory duct.
A polyamine found in some bacteria; associated with nucleic acids in some viruses; found in human sperm; important in cell and tissue growth. SYN: gerontine, musculamine, neuridine.
That segment of spermatogenesis during which immature spermatids become spermatozoa. [sperm- + G. genesis, origin]
The belief by preformationists that the male sex cell (sperm) contains a miniature preformed body called the homunculus.
A preformationist who believed in the concept of spermism. Cf.:ovist.
spermium, pl .spermia (sper′me-um, -a)
H.W.G. Waldeyer term for the mature male germ cell or spermatozoon.
A concretion in the ductus deferens. [spermo- + G. lithos, stone]
A genus of ground squirrel. S. beecheyi, S. grammurus, S. pygmaeus, S. townsendi, and several other species act as an important reservoir of Yersinia pestis.
Abbreviation for sun protection factor.
Abbreviation for specific gravity.
Abbreviation for spherical, or spherical lens.
To become gangrenous or necrotic. [G. sphakelos, gangrene]
1. The process of becoming gangrenous or necrotic. 2. Gangrene or necrosis. [G. sphakelos, gangrene]
The condition manifested by a sphacelus.
Sloughing, gangrenous, or necrotic.
A mass of sloughing, gangrenous, or necrotic matter. [G. sphakelos, gangrene]
A genus of bacteria closely related to Leptothrix found in fresh water; S. natans grows a thick biofilm mat in sulfite-containing water, especially as drained from paper mills.
The tip of the sphenoidal angle of the parietal bone; a craniometric point. [Mod. L. fr. G. sphen, wedge, + dim. -ion]
Wedge, wedge-shaped; the sphenoid bone. [G. sphen, wedge]
Relating to the sphenoid bone and the basilar process of the occipital bone. SYN: sphenoccipital, sphenooccipital.
Condition characterized by a deformation of the skull giving it a wedge-shaped appearance. [spheno- + G. kephale, head]
Relating to the sphenoid and ethmoid bones. SYN: sphenethmoid.
An operation to remove diseased tissue from the sphenoid and ethmoid sinuses.
Relating to the sphenoid and frontal bones.
sphenoid (sfe′noyd) [TA]
1. SYN: sphenoidal. 2. SYN: s. (bone). [G. sphenoeides, fr. sphen, wedge, + eidos, resemblance]
1. Relating to the sphenoid bone. 2. Wedge-shaped. SYN: sphenoid (1) [TA] .
The point of greatest convexity between the anterior contour of the sella turcica and the jugum s..
1. Inflammation of the sphenoid sinus. 2. Necrosis of the sphenoid bone. [sphenoid + G. -itis, inflammation]
An operative opening made in the anterior wall of the sphenoid sinus. [sphenoid + G. stoma, mouth]
Any operation on the sphenoid bone or sinus. [sphenoid + G. tome, a cutting]
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