Skip to main content

Unfortunately we don't fully support your browser. If you have the option to, please upgrade to a newer version or use Mozilla Firefox, Microsoft Edge, Google Chrome, or Safari 14 or newer. If you are unable to, and need support, please send us your feedback.

Publish with us
Medullary Cords
Lymphoid System

Medullary Cords

Chorda medullaris

Read more

Quick Facts

The medullary cords are strands of dense lymphoid tissue surrounded by the sinuses of the medulla of a lymph node (Dorland, 2011).

Complete Anatomy
The world's most advanced 3D anatomy platform
Try it for Free
Related parts of the anatomy


The medullary cords and sinuses constitute the medulla of the lymph node. Medullary cords are usually clearly delineated because of their dense cellularity compared to the surrounding medullary sinuses. The cords are composed of dense, irregular reticular fibers, which are denser than the fibers in the cortex and paracortex. Arterioles and venules supplying and draining blood from the lymph node are conveyed through the medullary cords.

The medullary cords contain a large number of mature plasma cells, lymphocytes and macrophages. The plasma cells are capable of secreting antibodies into the medullary sinuses or migrate into the sinus so that they enter the lymph that is transported into the efferent lymphatic vessel, and eventually enters the circulatory system.


The medullary cords anchor and house macrophages, dendritic cells, plasma cells, and B lymphocytes. In addition, blood vessels traverse through the medullary cords (Willard-Mack, 2006).


Dorland, W. (2011) Dorland's Illustrated Medical Dictionary. 32nd edn. Philadelphia, USA: Elsevier Saunders.

Willard-Mack, C. L. (2006) 'Normal structure, function, and histology of lymph nodes', Toxicologic Pathology, 5(34), pp. 409-424.

Complete Anatomy

The world's most advanced 3D anatomy platform

Complete Anatomy