Lymph Nodes page 655

1. Structure of a lymph node a. Lymph nodes are usually bean-shaped, with blood vessels, nerves, and efferent lymphatic vessels attached to the indented region; afferent lymphatic vessels enter at points on the convex surface.

b. Lymph nodes are enclosed in connective tissue that extends into the nodes and subdivides them into nodules.

c. Nodules contain masses of lymphocytes and macrophages, as well as spaces through which lymph flows.

2. Locations of lymph nodes a. Lymph nodes aggregate in groups or chains along the paths of larger lymphatic vessels.

b. They primarily occur in cervical, axillary, and inguinal regions, and within the pelvic, abdominal, and thoracic cavities.

3. Functions of lymph nodes a. Lymph nodes filter potentially harmful foreign particles from the lymph before it is returned to the bloodstream.

b. Lymph nodes are centers for production of lymphocytes that act against foreign particles.

c. They contain macrophages that remove foreign particles from lymph.

Essentials of Human Physiology

Essentials of Human Physiology

This ebook provides an introductory explanation of the workings of the human body, with an effort to draw connections between the body systems and explain their interdependencies. A framework for the book is homeostasis and how the body maintains balance within each system. This is intended as a first introduction to physiology for a college-level course.

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