VENOUS SYSTEM

1. It is collecting system formed by the uniting branches as smaller and then larger veins and venacava leading to the heart.
2. Blood from anterior part of the body is returned to heart by two (in general mammals) anterior venacavae (or precavals), while from the posterior part by single posterior venacava (or postcaval).
3. Human Heart receives blood only through two great veins: Superior vena cava from anterior part and inferior vena cava from posterior part.
4. Precaval is formed by the union of common' Jugular vein, subclavian vein, intercostal vein and anterior azygos vein.
5. The jugular veins as external and internal jugulars bring blood from head and neck. The right and left external jugulars are connected through jugular anastomosis. The subclavian vein brings blood from forelimbs and shoulder.
6. A pair of pulmonary veins come from lungs and open by a common pore into left auricle.
7. In posterior part the main vein is dorsal vein which leads to heart as postcaval. This is formed by the union of one renal vein from each kidney, one hepatic vein, gonadal veins and veins from hind limbs like sciatic and femoral veins.
8. As speciality the venous system forms portal system in some parts of the body.

Posted Date: 10/2/2012 3:14:07 AM | Location : United States

Ask an Expert

Related Discussions:- Venous system, Assignment Help, Ask Question on Venous system, Get Answer, Expert's Help, Venous system Discussions

Write discussion on Venous system
Your posts are moderated

Write your message here..

Related Questions

Disadvantages of Protozoa, Disadvantages of Protozoa Disadvantages of Protozoa

Energy, Energy Contrary  to matter.  Energy neither occupies space, nor... Energy Contrary  to matter.  Energy neither occupies space, nor possesses mass. Hence it is defined, not on   physical ,but on operational or functional basis as the force whic

Potassium ion can pass easily through cell membranes, In the human body, th... In the human body, the potassium ion can pass easily through cell membranes, yet the potassium ion concentration is higher inside many cells than it is outside these cells. Could t

Help, #Predict: In order to be able to energize a transport protein by phos... #Predict: In order to be able to energize a transport protein by phosphorylation (by addition of a phosphate group from ATP), the portion of the protein to which the phosphate grou

Explain the sponge method, Explain the Sponge Method? In the sponge met... Explain the Sponge Method? In the sponge method, sterilized sponge with 45 x 5 cm contact surface and free from antimicrobial agent is used. Aseptically, it is moistened with 1

Define effect on human placental lactogen in pregnancy, Define effect on Hu... Define effect on Human placental lactogen in pregnancy? Human placental lactogen, with a structure similar to the growth hormone, increases throughout pregnancy. Its rate of pr

Epidemiology, The epidemiology of acute rheumatic fever (ARF) is closely co... The epidemiology of acute rheumatic fever (ARF) is closely connected with that of group-A beta haemolytic streptococcal pharyngitis, both have a maximum incidence in the age group

Foot as burrowing organ, Foot as Burrowing Organ The Scaphopoda that ... Foot as Burrowing Organ The Scaphopoda that usually have burrowing habit, possess foot suitably modified for burrowing purpose. The conical and protrusible foot of Dentalium

Tautomeric shifts, The original DNA sequence when ,transcribed and translat... The original DNA sequence when ,transcribed and translated would yield five successive valine residues. But the altered sequence would correspondingly read one aspartate and four s

What are the symptoms of mitral stenosis, Q. What are the Symptoms of Mitra... Q. What are the Symptoms of Mitral stenosis? The cardinal symptom of mitral stenosis is dyspnoea on exertion. Typically it progresses over a period of years. As the severity in