Biomaterial Database

Atrial septation in the rat. I. A light microscopic and histochemical study. 1986

C S Rogers, and D E Morse

Light microscopy and histochemistry consisting of alcian blue staining were utilized to study atrial septation in the albino rat heart. Light microscopy shows septum primum to develop from the dorsocranial wall of the primitive atrium by day 12.50. Foramen secundum rapidly develops in the ventrocranial portion of septum primum during day 13.00. A second septum appears to the right of septum primum in the rat as the foramen secundum increases in size. The first evidence of septum secundum can be noted on histologic preparations as a small rounded bulge extending into the right atrium from the ventrocranial wall. This occurs at day 14.50. This septum continues to enlarge but does not fuse with the endocardial cushions as does septum primum. Alcian blue staining shows the presence of glycosaminoglycans (GAGs) concentrated heavily in the leading edge of the 12.50 day septum primum. GAGs are also present during foramen secundum formation in areas where endocardial cells aggregate. As development progresses, GAGs diminish in all areas of septum primum. Of particular interest is an area of intense alcian blue staining in the wall of the right atrium ventral and caudal to septum secundum development. This appears in histologic preparations of 13.50 and 14.50 day rat hearts.

UI	MeSH Term	Description	Entries
D008853	Microscopy	The use of instrumentation and techniques for visualizing material and details that cannot be seen by the unaided eye. It is usually done by enlarging images, transmitted by light or electron beams, with optical or magnetic lenses that magnify the entire image field. With scanning microscopy, images are generated by collecting output from the specimen in a point-by-point fashion, on a magnified scale, as it is scanned by a narrow beam of light or electrons, a laser, a conductive probe, or a topographical probe.	Compound Microscopy,Hand-Held Microscopy,Light Microscopy,Optical Microscopy,Simple Microscopy,Hand Held Microscopy,Microscopy, Compound,Microscopy, Hand-Held,Microscopy, Light,Microscopy, Optical,Microscopy, Simple
D011919	Rats, Inbred Strains	Genetically identical individuals developed from brother and sister matings which have been carried out for twenty or more generations or by parent x offspring matings carried out with certain restrictions. This also includes animals with a long history of closed colony breeding.	August Rats,Inbred Rat Strains,Inbred Strain of Rat,Inbred Strain of Rats,Inbred Strains of Rats,Rat, Inbred Strain,August Rat,Inbred Rat Strain,Inbred Strain Rat,Inbred Strain Rats,Inbred Strains Rat,Inbred Strains Rats,Rat Inbred Strain,Rat Inbred Strains,Rat Strain, Inbred,Rat Strains, Inbred,Rat, August,Rat, Inbred Strains,Rats Inbred Strain,Rats Inbred Strains,Rats, August,Rats, Inbred Strain,Strain Rat, Inbred,Strain Rats, Inbred,Strain, Inbred Rat,Strains, Inbred Rat
D005314	Embryonic and Fetal Development	Morphological and physiological development of EMBRYOS or FETUSES.	Embryo and Fetal Development,Prenatal Programming,Programming, Prenatal
D005865	Gestational Age	The age of the conceptus, beginning from the time of FERTILIZATION. In clinical obstetrics, the gestational age is often estimated from the onset of the last MENSTRUATION which is about 2 weeks before OVULATION and fertilization. It is also estimated to begin from fertilization, estrus, coitus, or artificial insemination.	Embryologic Age,Fetal Maturity, Chronologic,Chronologic Fetal Maturity,Fetal Age,Maturity, Chronologic Fetal,Age, Embryologic,Age, Fetal,Age, Gestational,Ages, Embryologic,Ages, Fetal,Ages, Gestational,Embryologic Ages,Fetal Ages,Gestational Ages
D006025	Glycosaminoglycans	Heteropolysaccharides which contain an N-acetylated hexosamine in a characteristic repeating disaccharide unit. The repeating structure of each disaccharide involves alternate 1,4- and 1,3-linkages consisting of either N-acetylglucosamine (see ACETYLGLUCOSAMINE) or N-acetylgalactosamine (see ACETYLGALACTOSAMINE).	Glycosaminoglycan,Mucopolysaccharides
D006325	Heart Atria	The chambers of the heart, to which the BLOOD returns from the circulation.	Heart Atrium,Left Atrium,Right Atrium,Atria, Heart,Atrium, Heart,Atrium, Left,Atrium, Right
D006346	Heart Septum	This structure includes the thin muscular atrial septum between the two HEART ATRIA, and the thick muscular ventricular septum between the two HEART VENTRICLES.	Cardiac Septum,Heart Septa,Septa, Heart,Septum, Cardiac,Septum, Heart
D006821	Hyaluronoglucosaminidase	An enzyme that catalyzes the random hydrolysis of 1,4-linkages between N-acetyl-beta-D-glucosamine and D-glucuronate residues in hyaluronate. (From Enzyme Nomenclature, 1992) There has been use as ANTINEOPLASTIC AGENTS to limit NEOPLASM METASTASIS.	Hyaluronidase,Duran-Reynals Permeability Factor,GL Enzyme,Hyaglosidase,Hyaluronate Hydrolase,Wydase,Duran Reynals Permeability Factor,Factor, Duran-Reynals Permeability,Hydrolase, Hyaluronate,Permeability Factor, Duran-Reynals
D006863	Hydrogen-Ion Concentration	The normality of a solution with respect to HYDROGEN ions; H+. It is related to acidity measurements in most cases by pH	pH,Concentration, Hydrogen-Ion,Concentrations, Hydrogen-Ion,Hydrogen Ion Concentration,Hydrogen-Ion Concentrations
D000423	Alcian Blue	A copper-containing dye used as a gelling agent for lubricants, for staining of bacteria and for the dyeing of histiocytes and fibroblasts in vivo.	Alcian Blue 8GS,Alcian Blue 8GX,8GS, Alcian Blue,8GX, Alcian Blue,Blue 8GS, Alcian,Blue 8GX, Alcian,Blue, Alcian