Splenic circulation : lecture note

Splenic circulation:

1.      Splenic artery entering at the hilum of the spleen

2.      Via trabeculae the trabecular artery inter the spleen

3.      Then leave the trabeculae enter into the parenchyma,& surrounded by  periarterial

       lymphatic sheath, occasional lymphatic nodules, now  it is called central artery

4.        The central artery enter the red pulp by losing the lymphatic sheath &  subdivided into Numerous straight vessels, known as penicillar arteries

5.      The penicillar artery terminate into 2 to 3 sheath capillaries, than formed terminal  arterial capillaries (TAC)

6.      TAC directly drain into sinusoids (closed circulation)

                                           Or

7.      TAC terminate as  open ended vessels in the splenic cords ( open circulation)

Primary lymphatic nodule: the lymphatic nodule which do not contain germinal centre

Secondary lymphatic nodule: the lymphatic nodule which contains germinal centre

 

Closed circulation:

Splenic artery →the trabecular artery →central artery →penicillar arteries→ terminal  arterial capillaries (TAC) →splenic sinusoids →splenic vein

Open circulation:

Splenic artery →the trabecular artery →central artery →penicillar arteries→terminal  arterial capillaries (TAC) →red pulp →splenic sinusoids →splenic vein