Actin bundles on the right side in the caudal part of the heart tube play a role in dextro-looping in the embryonic chick heart

1991 ◽  
Vol 183 (1) ◽  
Author(s):  
Nobue Itasaki ◽  
Harukazu Nakamura ◽  
Hiroshi Sumida ◽  
Mineo Yasuda
Keyword(s):  
Embryonic Chick ◽  
Heart Tube ◽  
Caudal Part ◽  
Actin Bundles ◽  
Chick Heart ◽  
Embryonic Chick Heart ◽  
The Right

Surface Strains in the Looping Embryonic Chick Heart Measured Using Optical Coherence Tomography

2007 ◽  
Author(s):  
Benjamen A. Filas ◽  
Larry A. Taber
Keyword(s):  
Heart Defects ◽  
Embryonic Chick ◽  
Heart Tube ◽  
Live Births ◽  
Shaped Tube ◽  
Vertebrate Embryo ◽  
Chick Heart ◽  
Embryonic Chick Heart ◽  
Left Right Asymmetry ◽  
Insight Into

The heart is the first functional organ in the vertebrate embryo. In the chick embryo, the heart begins beating at Hamburger and Hamilton [1] stage 10 (approximately 35 hours of a 21-day incubation period). The initially straight heart tube bends and twists into a c-shaped tube before reaching stage 12 (approximately 48 hours incubation). This process, known as c-looping, marks one of the first visible signs of left-right asymmetry in the embryo. Incorrect looping is one cause of congenital heart defects, where significant malformations occur in roughly 1% of human live births [2]. Understanding the mechanisms that drive c-looping could lend insight into the processes causing some of these defects.

Desmosome frequency: Experimental alteration may correlate with differential cell adhesion

1981 ◽  
Vol 49 (1) ◽  
pp. 217-223
Author(s):  
L.L. Wiseman ◽  
J. Strickler
Keyword(s):  
Cell Adhesion ◽  
Heart Tissue ◽  
Embryonic Chick ◽  
Heart Ventricle ◽  
Differential Adhesion ◽  
Experimental Alteration ◽  
Differential Cell ◽  
Chick Heart ◽  
Embryonic Chick Heart ◽  
The Right

Differential cell adhesion, a suggested guiding force for tissue rearrangement during embryogenesis, could be affected by desmosome frequency. A model system for studying embryonic tissue-positioning behaviour involves combining different tissues and following their rearrangements. We have previously shown that for one tissue, embryonic chick heart ventricle, direction of tissue positioning can be altered experimentally. Heart tissue precultured for 2.5 days tends to segregate internally, while tissue pre-cultured for just half a day tends to segregate externally. Also, intact fragments of tissue tend to segregate internally, while reaggregates of trypsin-disaggregated tissues tend to segregate externally. We show here that treatments that increase the tendency to internalize also increase the frequency of adherens junctions and treatments that increase the tendency to externalize decrease the frequency of junctions. An identical hierarchical ordering of the 4 experimental tissues occurs with respect to positioning behaviour and desmosome frequency. In the hierarchy, 2.5-day-cultured fragments greater than 2.5-day-cultured reaggregates greater than 0.5-day-cultured fragments 0.5-day-cultured reaggregates, tissues to the left tend to segregate internally and to have more desmosomes. Tissues to the right segregate externally and have fewer desmosome. This is what is expected if desmosome are organelles for adhesion and if differential adhesion is a factor in tissue-positioning behaviour.

scholarly journals The Electrophysiological Organization of the Embryonic Chick Heart

1965 ◽  
Vol 49 (2) ◽  
pp. 351-363 ◽  
Author(s):  
Melvyn Lieberman ◽  
Antonio Paes de Carvalho
Keyword(s):  
Action Potentials ◽  
Adult Rabbit ◽  
Embryonic Chick ◽  
Surface Electrodes ◽  
Transmembrane Potentials ◽  
Functional Regions ◽  
Purkinje System ◽  
Chick Heart ◽  
Embryonic Chick Heart ◽  
The Right

Both intracellular and surface electrodes were employed to record electrical activity from embryonic chick hearts between the ages of 3 and 20 days. Cells from the sinus venosus, sinoatrial (SA) valves, atrium, atrioventricular (AV) ring, and ventricle were localized and characterized on the basis of shape, amplitude, rise time, and duration of transmembrane potentials. The differences in transmembrane potentials from these various regions provided the basis for a hypothesis concerned with the distribution of pacemaker potentiality and one related to the origin of the His-Purkinje system. Action potentials recorded along the entire embryonic AV ring were comparable to those of the adult rabbit AV nodal cells in both configuration and sequence of activation and were thus categorized into three functional regions (AN, N, NH). Histological sections of 7 and 14 day hearts demonstrated muscular continuity between the right atrium and ventricle across the muscular AV valve.

Acetylcholinesterase-acetylcholine, an enzyme system essential to rhythmicity in the preneural embryonic chick heart

1966 ◽  
Vol 154 (3) ◽  
pp. 675-683 ◽  
Author(s):  
George Hugo Paff ◽  
Robert Joseph Boucek ◽  
Thorne Parsons Glander
Keyword(s):  
Enzyme System ◽  
Embryonic Chick ◽  
Chick Heart ◽  
Embryonic Chick Heart
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