Let us illuminate the immune system (2)

Against the dark silhouette of a human form, two of the systems organs glow bright:  the thymus, a small, two lobed organ just behind the breastbone, and the soft, gelatinous tissue of the marrow deep within our long bones.  In these primary lymphoid organs, lymphocytes grow and develop.

Also glowing are the secondary lymphoid organs, the sites where lymphocytes are stored and where some immune responses take place.  These include the spleen, an organ in the upper abdomen that filters blood, and the lymph nodes, pulpy clumps of tissue as well as the tonsils, adenoids, appendix, and the Peyer’s patches, bits of lymphoid tissue embedded in the walls of the small intestine.

Amazing isn’t it?

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s