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Anatomy

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Histology

Question
40 out of 59
 

All of the following are the components of the white pulp of spleen, except (AIPG 2011)



A Periarteriolar lymphoid sheath

B B cells

C Antigen presenting cells

D Vascular sinus

Ans. D

Vascular sinus

White pulp: The altered coat of the arterioles, consisting of adenoid tissue, presents here and there thickening(s) of a spheroidal shape, (Malpighian bodies of the spleen, splenic lymphoid nodules).

 These bodies vary in size from about 0.25 mm. to 1 mm. in diameter.

 They are merely local expansions or hyperplasia of the adenoid tissue, of which the external coat of the smaller arteries of the spleen is formed.

 They are most frequently found surrounding the arteriole, which thus seems to tunnel them, but occasionally they grow from one side of the vessel only, and present the appearance of a sessile bud growing from the arterial wall.

The red pulp (also called splenic pulp, but should not be confused with white pulp) is a soft mass of a dark reddish-brown color, resembling grumous blood

 It consists of a fine reticulum of fibers, continuous with those of the splenic trabeculae, to which are applied flat, branching cells.

 The space of the red pulp is divided into cords of Billroth and sinusoids.

Cells found in red pulp

 The meshes of the reticulum are filled with blood:

 The white corpuscles are found to be in larger proportion than they are in ordinary blood.

 Large rounded cells, termed splenic cells, are also seen; these are capable of ameboid movement, and often contain pigment and red-blood corpuscles in their interior.

 The cells of the reticulum each possess a round or oval nucleus, and like the splenic cells, they may contain pigment granules in their cytoplasm; they do not stain deeply with carmine, and in this respect differ from the cells of the Malpighian bodies.

 In the young spleen, giant cells may also be found, each containing numerous nuclei or one compound nucleus.

 Nucleated red-blood corpuscles have also been found in the spleen of young animals.

Histology Flashcard List

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