<prompt> Billohs cord are present in which pa of spleen?White pulpRed pulpBothCapsule  <response>: Ans. is b i.e., Red pulp Histology of spleen Spleen has a capsule which is mainly composed of collagen with some elastin. Trabeculae are septae pass inwards from the capsule. Spleen is mainly composed of two pas : White pulp : The white pulp of the spleen is formed of mass of T and B lymphocytes surrounding central aery, arranged as lymphoid nodule. Each nodule is also called Malpigian bodies. Marginal zone surrounds the white pulp and contains antigen presenting cells as macrophages. Red pulp : Red pulp is made up of a mesh of leaky sinusoids vascular sinuses through which the red cells are squeezed. Adjacent blood spaces contain blood cells and arranged in cords called splenic cords of billoh. 