Spermatogenesis as the cells progress from spermatogium, to primary spermatocytes, to secondary spermatocytes, to spermatids and to sperm.
Spermatocytes are a type of male gametocyte in animals. They derive from immature germ cells called spermatogonia. They are found in the testis, in a structure known as the seminiferous tubules.[1] There are two types of spermatocytes, primary and secondary spermatocytes. Primary and secondary spermatocytes are formed through the process of spermatocytogenesis.[2]
Primary spermatocytes are diploid (2N) cells. After meiosis I, two secondary spermatocytes are formed. Secondary spermatocytes are haploid (N) cells that contain half the number of chromosomes.[1]
In all animals, males produce spermatocytes, even hermaphrodites such as C. elegans, which exist as a male or hermaphrodite. In hermaphrodite C. elegans, sperm production occurs first and is then stored in the spermatheca. Once the eggs are formed, they are able to self-fertilize and produce up to 350 progeny.[3]
^ abBoron, Walter F., MD, Ph.D., Editor; Boulpaep, Emile L. (2012). "54". Medical physiology a cellular and molecular approach (Print) (Updated second ed.). Philadelphia: Saunders Elsevier. ISBN 978-1-4377-1753-2. {{cite book}}: |first1= has generic name (help)CS1 maint: multiple names: authors list (link)[page needed]
^Cite error: The named reference sperm was invoked but never defined (see the help page).
^Riddle, DL; Blumenthal, T; Meyer, B.J.; et al., eds. (1997). "I, The Biological Model". C. elegans II (2nd ed.). Cold Spring Harbor. NY: Cold Spring Harbor Laboratory Press. Retrieved April 13, 2014.
tubules. There are two types of spermatocytes, primary and secondary spermatocytes. Primary and secondary spermatocytes are formed through the process...
primary spermatocytes. The primary spermatocyte divides meiotically (Meiosis I) into two secondary spermatocytes; each secondary spermatocyte divides...
multi-step process. A primary spermatocyte with the full diploid number of chromosomes divides to form two secondary spermatocytes which are haploid, i.e.,...
secondary spermatocytes. As a result of meiosis, each spermatid contains only half of the genetic material present in the original primary spermatocyte. Spermatids...
male gamete formation in animals, involves meiosis in a diploid primary spermatocyte to produce haploid spermatozoa. In animals, ova are produced in the ovaries...
spermatogonium, is a spermatogonium that does not differentiate into a spermatocyte, a precursor of sperm cells. Instead, they continue dividing into other...
Type B cells. Type B cells, which undergo growth and become primary spermatocytes. Anticancer drugs such as doxorubicin and vincristine can adversely...
have a higher mutation frequency than spermatogenic cells. Compared to spermatocytes, the mutation frequency is about 5 to 10-fold higher in Sertoli cells...
precursors, starting with spermatogonia, which differentiate into spermatocytes. The spermatocytes then undergo meiosis, reducing their chromosome number by half...
Meiosis during spermatogenesis is specific to a type of cell called spermatocytes, which will later mature to become spermatozoa. Meiosis of primordial...
meiosis into gametids during gametogenesis. Male gametocytes are called spermatocytes, and female gametocytes are called oocytes. The development of gametogonia...
themselves through cell division, whereas diploid germ cells (i.e., primary spermatocytes and primary oocytes) go through meiosis in order to create haploid gametes...
secrete polysaccharides that also form part of the mesohyl. Oocytes and spermatocytes are reproductive cells. Sclerocytes secrete the mineralized spicules...
These primary spermatocytes. These diploid cells undergo meiotic division to create secondary spermatocytes. These secondary spermatocytes undergo a second...
to lubricate it. Sertoli cells, which nurture and support developing spermatocytes, secrete a fluid into seminiferous tubules that helps transport sperm...
the seminiferous tubules, the germ cells develop into spermatogonia, spermatocytes, spermatids and spermatozoa through the process of spermatogenesis....
to form the spermatogonia, which in turn generate spermatocytes by mitosis. Then each spermatocyte gives rise to four spermatids through meiosis. Spermatids...
meiotic division is symmetric such that each primary spermatocyte gives rise to 2 secondary spermatocytes after meiosis I, and eventually 4 spermatids after...
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