.jpg)
Archive | September, 2008
Development of Diaphragm and Diaphragmatic Hernia
The diaphragm develops in the region of the neck in the septum transversum. Here it receives the nerve supplying from cervical plexus c3,4,5. The same nerve is dragged downwards during its descent. It indicates to caudal direction during development. The whole of the diaphragm is developed from -
Continue reading...Development of Superior venacava, Azygos and Hemi-Azygos vein
13. September 2008
In the foetus the blood of the body wall s drained by two pairs of cardinal veins, anterior and posterior cardinal veins. These two unite and forms common cardinal veins or duct of cuvier. These open into corresponding horns of sinus sinus venosus.
Continue reading...Fetal circulation
13. September 2008
Throughout fetal life the lungs are not functioning. Its function is taken up by the placenta. Therefore the placenta oxygenates the venous blood and also removes the waste products. The left umblical vein carries the pure blood from the placenta to the liver of the foetus, from there it is shunted by ductus venosus into [...]
Continue reading...Development of Interventricular septum and Ventricles
13. September 2008
Development of Interventricular septum- A muscular diverticulum develops from the floor of the A.V cusion for a short period. It is seperated by a small gap from the atrio-ventricular cusion. It is called “interventricular foramen”. Later the atrio-ventricular cusion develops downwards and fuses with the muscular part thus closing the intra-ventricular foramen. VENTRICLES- The ventricles [...]
Continue reading...Development of right atrium
13. September 2008
The two parts of the right atrium develops from two diffrent sources. a) The anterior rough muscular part of right atrium and right auricle develops from right half of atrial chamber. b) The posterior smooth part of atrium develops from the right horn of sinus venosus. The tributaries of sinus venosus also open into the [...]
Continue reading...Formation of Interatrial septum
13. September 2008
The atrial chamber communicates posteriorly with sinus venosus and anteroinferiorly with the ventricle through the atrio -ventricular canal. a) A septum arises from the roof of the atrial chamber a little to the left of the opening of sinus venosus. This is the “Septum Primum”. It grows downwards towards the septum intermedium of the atrio-ventricular [...]
Continue reading...Development of Heart, Arterial and Venous ends
11. September 2008
The heart initially develops as a single heart tube and is suspended from the posterior thoracic wall by dorsal mesocardium. The heart has an arterial end and a venous end. ARTERIAL END- The bulbus cordis, represent the arterial end of the heart. It consists of a proximal part called conus and a distal part called [...]
Continue reading...Development of Respiratory system or Lungs
5. September 2008
The respiratory system develops from the median diverticulum of the foregut. Its lining epithelium is therefore of endodermal in origin. The connective tissue cartilage and muscle, in relation to the organs of respiration are derived from splanchno-pleuric mesoderm. The respiratory diverticulum deepens to form tracheobronchial groove. Initially it communicates with the foregut, but later it [...]
Continue reading...Development of ventricles of Brain
5. September 2008
VENTRICULAR SYSTEM OF THE BRAIN– It develops from the canal of the neural tube. Development of ventricles of brain layers– In the developing neural tube there are three layers from inside to outside. They are - a) Matrix cell layer or Germinative cell layer or Ependymal cell layer:- It contains the mother cells or the [...]
Continue reading...© 2008 Medicine and Health related Information. Powered by Wordpress.
13. September 2008
0 Comments