Human Lymph Node

Quick Answer: The human lymph node model is an enlarged sectional model of a lymph node, the small bean-shaped organ that filters lymph. It shows the capsule, cortex, paracortex and medulla with the vessels that bring lymph in and take it out, and is used to teach the lymphatic and immune systems.

Inside a Lymph Node, Enlarged

Real lymph nodes are small, often no bigger than a bean, so their internal zones can only be taught from an enlarged model or a microscope slide. A lymph node model opens the node in section. A fibrous capsule surrounds it and sends partitions called trabeculae inward; beneath the capsule is the cortex, where rounded lymphoid follicles hold mainly B lymphocytes, several with paler germinal centres where those cells multiply during an immune response.

Deeper in, the paracortex is dominated by T lymphocytes, and the medulla contains cords of cells and open channels, the medullary sinuses, through which lymph drains toward the hilum. Lymph enters through several afferent vessels on the convex surface and leaves through efferent vessels at the hilum, where the node’s artery and vein also pass. Having more vessels entering than leaving slows the flow, giving immune cells time to meet any microbes or foreign particles carried in the lymph.

This structure explains a familiar sign: nodes near an infection often swell and become tender because lymphocytes are multiplying inside them. Nurses and allied health students also learn the main node groups in the neck, armpit and groin, since those are the ones that can be felt. The sectional model covers one node; the wider network of vessels and node groups is usually taught with a whole-body lymphatic model or chart.

Teaching Uses

• Explaining how lymph is filtered on its way back to the bloodstream
• Locating B-cell and T-cell zones in immunology lessons
• Showing why lymph nodes swell during infection
• Linking a histology slide of a lymph node to its three-dimensional structure

Specifications

Care & Handling

• Keep the lymph node model on a flat surface on its base; small sectional models are easily knocked off benches.
• Clean with a soft dry brush to remove dust from the textured cut surface, and use only a barely damp cloth if needed.
• Store away from heat and bright sunlight to protect the colours used to mark each zone.

Why Choose LabEquip

Nursing colleges, paramedical institutes and senior biology classes use a lymph node model to connect immunology with visible structure. LabEquip supplies it with its biology lab products, alongside the intestinal villus model that shows the lacteals where lymph from the gut begins its journey. Ask about size and detail through the LabEquip contact page.

Frequently Asked Questions

What does a lymph node do?

It filters lymph, the fluid returning from the tissues to the blood. Immune cells inside the node trap and respond to microbes, damaged cells and foreign particles carried in that fluid.

Why do lymph nodes swell during an infection?

Lymphocytes in the node multiply to fight the infection, and fluid and immune cells build up. The node becomes larger and often tender until the infection settles.

What is the difference between the cortex and the medulla of a lymph node?

The outer cortex contains follicles rich in B lymphocytes, with T lymphocytes in the deeper paracortex. The inner medulla has cords of cells and sinuses through which lymph drains toward the exit at the hilum.

Why are there more vessels entering a node than leaving it?

Several afferent vessels bring lymph in, but usually only one or two efferent vessels take it out. This slows the flow through the node and gives immune cells more time to act.

Where can lymph nodes be felt in the body?

The groups most easily felt are in the neck, under the jaw, in the armpits and in the groin. Many more lie deep in the chest and abdomen along blood vessels.

How does the model relate to a microscope slide?

A slide shows a thin two-dimensional section of a real node under magnification. The model shows the same zones in three dimensions, which helps students interpret what they see down the microscope.

Last Updated: September 2026