Heart formation: left whole-mount preparation and right cross section (dorsal part oriented to the left)ġ = Spine, 2 = Somite differentiation (sclerotome dermamyotome), 3 = Chorda, 4 = Dorsal aorta arches, 5 = Cranial cardinale vein, 6 = Pharynx, 7 = Pericardial cavity, 8 = Heart formationĬ. Ear and eye formation: left whole mount and right cross section (dorsal part oriented to the left here)ġ = Myencephalon, 2 = Otic vesicle, 3 = Chorda, 4 = Pharyngeal cavity, 5 = Pharynx, 6 = Optic vesicle, 7 = Lens placode (lens formation), 8 = Optic cup, 9 = DiencephalonĪ, b, c, d : schematical representation of the eye formation overtime e and f: detail of sectionsġ = Neurectoderm, 2 = Epidermal (surface) ectoderm, 3 = Mesoderm, 4 = Optical vesicle, 5 = Optical cup, 6 = lens, lp = Lens placode (lens formation)ī. The atrium and ventricle are well distinguishable in the figure.Įmbryology in chicken 48 hours after fertilization: stained whole-mount preparationġ Amnion, 2 Metencephalon, 3 Mesencephalon, 4 Optic cup + lens, 5 Prosencephalon, 6 Otic vesicle, 7 Branchial arches, 8 Atrium, 9 Ventricle, 10 Lateral fold, 11 Lateral mesoderm, 12 Vitelline arteria / vein, 13 Somite, 14 Spine, 15 Tail foldĪ. The heart differentiates in to 4 compartiments: the sinus venosus, connected with the veins, the atrium, the U-shaped ventricle and the bulbus cordis. Use the same procedure as for the 24-hour stage.
48 hour chick embryo serial cross section serial#
The lens placode (placode=plate) will form the lens vesicle, the optic vesicle will become the optic cup and the auditory placode the auditory pit. This film was compiled fromphotographing serial cross-sections of the embryo. The brain divides in to 5 vesicles: telencephalon and diencephalon (both formed by the division of the forebrain vesicle), mesencephalon, metencephalon and myencephalon (both formed by the division of the hindbrain vesicle).
![48 hour chick embryo serial cross section 48 hour chick embryo serial cross section](https://new-fullview-html.oneclass.com/o86Y91n7AWjgj2Za52MPxweyjMX3Nl5V/low/bg4.png)
A few branchial grooves are already visible. The vitelline (yolk rich) arteries and veins become connected with the extra embryonic circulatory vessels. These folds definitely establish the first extra embryonic membrane (=outside of the embryo): the amnion membrane. The head becomes covered by a double fold. A second flexure appears at the transition of the head and the body just behind the heart region. The cephalic region of the embryo is twisted in such a manner that the left side comes to lie next to the yolk. Serial microscope slides are prepared to show sequential cross-sectional views of an entire. This stage is characterized by ventral flexion and dextral torsion, resulting in a 'C-shaped' embryo. A prominent heart and a few branchial grooves are present. The outgrowth of the cranial flexure is so strong that the forebrain and hindbrain vesicles become almost located to each other. Sequential cross sections of a 48-hour chick embryo mounted in rows on microscope slides. In addition to the head fold of the amnion, also the lateral and caudal amniotic folds begin to form. The position of the embryo with respect to the yolk changes strongly about 48 hours after fertilization.
![48 hour chick embryo serial cross section 48 hour chick embryo serial cross section](https://www.bioscience.com.pk/media/k2/items/cache/ab9083c4344a26f28a8b1378ce88e8e8_XL.jpg)
![48 hour chick embryo serial cross section 48 hour chick embryo serial cross section](https://www.vcbio.science.ru.nl/images/embryology/$$-EmbryologyGallusdomesticus48h-sectionA.jpg)
On this page the following view of the embryology in chicken are displayed: