| Authors: |
Şişu Alina, Motoc Andrei, Niculescu Marius, Petrescu Codruţa, Cebzan Ciprian, Stana Loredana, Folescu Roxana, Boşcu Anca |
| Abstract text: |
Although morphologically it belongs to the stomach, the pylorus is provided with individual extrinsic and intrinsic innervation. For the present study we used human adult specimens, dissected to evidence the extrinsic pyloric innervation. Human fetal specimens with crown-rump lengths from 9 to 28 cm and a newborn were used for microscopic preparates (Masson, Bielschowsky) on which parameters of enteric nervous system ontogenesis were followed in the wall of pylorus. Extrinsically, the direct vagal branches respect the pylorus which is provided with nerves from the celiac and hepatic plexuses. Intrinsically, during the fetal life the pyloric wall exhibits a primitive neuronal configuration: ganglionic organization and numeric reshuffling evolve with the fetal age and mature neuronal morphology is attained postnatal. Intrinsic, the parietal ganglion configuration is evidenced on the 5 month foetus, where still have an primitive and unorganized aspect. Appears early the arrangement of the primitive nerve cells in to the mienteric ganglia, related to the sub mucous layer where only after birth ganglia are well evidenced on the specimens. It is remarkable the sector presence of argirophyle cells on the 8 month fetus pylorus, posterior-superior, correlated with the macroscopic dissection of the pedicle from the hepatic plexus. These argirophyle elements (I Dogiel type), with intrinsic coordinator, or are on the way to be colonized on pyloric wall circumference (similarly aspects in the next segment of the pylorus, like the first duodenum) or have a balanced location on the circumference, ensuring a fine tuning at this level. |
