Upper and Lower Limbs

Lymphatic drainage of the upper and lower limbs is organized into superficial and deep lymphatic networks. These vessels collect excess interstitial fluid, transport immune cells and antigens toward regional lymph nodes, and ultimately return lymph to the central venous circulation.

Superficial lymphatic vessels lie mainly within the subcutaneous tissue and tend to accompany major superficial veins. Deep lymphatic vessels accompany the deep arteries and veins and drain muscles, joints, bones, and other deep structures.

In the upper limb, lymph ultimately drains predominantly through the axillary lymph nodes. In the lower limb, most lymph passes through the inguinal lymph nodes. Smaller intermediate nodal groups, particularly the cubital nodes in the upper limb and popliteal nodes in the lower limb, receive lymph from specific territories.

General Organization

The lymphatics of each limb can be divided into two major systems:

• Superficial lymphatic vessels, which drain skin and subcutaneous tissues
• Deep lymphatic vessels, which drain muscles, joints, bones, and other deep structures

These systems communicate with one another and converge toward regional lymph nodes.

Superficial Lymphatic Vessels

Superficial lymphatics begin as lymphatic capillary networks within the skin and subcutaneous tissues.

They commonly follow superficial veins, making venous anatomy a useful guide for understanding major lymphatic pathways.

Deep Lymphatic Vessels

Deep lymphatics accompany major arteries and deep veins within the fascial compartments of the limbs.

They receive lymph from deep tissues and usually pass through deep regional lymph nodes before joining central lymphatic pathways.

Upper Limb Lymphatic Drainage

The upper limb contains superficial lymphatic vessels associated primarily with the cephalic and basilic venous territories, together with deep lymphatics accompanying the major deep vessels.

Most lymph from the upper limb eventually reaches the axillary lymph nodes.

Superficial Upper Limb Lymphatics

Superficial lymphatic vessels originate in the hand and ascend through the forearm and arm within the superficial fascia.

Major pathways generally accompany the basilic and cephalic veins.

Medial Superficial Pathway

Many superficial lymphatic vessels from the medial side of the hand and forearm accompany the basilic vein.

Some pass through cubital lymph nodes near the elbow before continuing proximally toward the axillary nodes.

Lateral Superficial Pathway

Superficial lymphatic vessels from the lateral side of the upper limb often accompany the cephalic vein.

They may pass toward deltopectoral nodes and then communicate with apical axillary lymph nodes.

Lymphatics of the Hand

The hand contains dense superficial and deep lymphatic networks.

Superficial vessels from the digits and palm communicate extensively and ascend into the forearm along superficial venous pathways.

Dorsal Hand Lymphatics

Lymphatic vessels on the dorsum of the hand accompany superficial veins and contribute to medial and lateral ascending pathways.

These vessels ultimately drain toward cubital, deltopectoral, or axillary nodal groups.

Cubital Lymph Nodes

The cubital lymph nodes, also called epitrochlear or supratrochlear nodes, are small lymph nodes located near the medial aspect of the elbow.

They are commonly associated with the basilic vein proximal to the medial epicondyle.

Cubital Node Drainage Territory

Cubital nodes receive lymph from portions of the medial hand, forearm, and superficial tissues of the upper limb.

Their efferent vessels ascend toward the axillary lymph nodes.

Deltopectoral Lymph Nodes

Small deltopectoral lymph nodes may occur along the cephalic vein in the deltopectoral groove.

They receive lymph from lateral superficial pathways and communicate with the apical axillary nodes.

Deep Upper Limb Lymphatics

Deep lymphatic vessels of the upper limb accompany the radial, ulnar, brachial, and related deep vessels.

They drain muscles, joints, periosteal tissues, and other structures deep to the investing fascia.

Axillary Lymph Nodes

The axillary lymph nodes form the principal regional lymph node group for the upper limb.

They also receive lymph from the breast and substantial portions of the thoracic and upper abdominal walls.

Axillary Node Groups

The axillary nodes are conventionally organized into several groups based on their anatomical relationships.

Group	General Location	Major Drainage
Humeral (lateral)	Along axillary vein	Most of upper limb
Pectoral (anterior)	Along lateral thoracic vessels	Anterior thoracic wall and much of breast
Subscapular (posterior)	Along subscapular vessels	Posterior thoracic wall and scapular region
Central	Within axillary fat	Receives from humeral, pectoral and subscapular groups
Apical	Near apex of axilla	Receives from other axillary groups and cephalic pathway

Humeral Axillary Nodes

The humeral or lateral axillary nodes lie mainly along the medial and posterior aspects of the axillary vein.

They receive most lymphatic drainage from the upper limb.

Upper Limb Pathways Bypassing Humeral Nodes

Not all upper limb lymph passes first through the humeral group.

Some superficial vessels accompanying the cephalic vein pass toward deltopectoral and apical axillary nodes.

Central Axillary Nodes

The central nodes receive lymph from several peripheral axillary groups.

Their efferent vessels pass primarily toward the apical nodes.

Apical Axillary Nodes

The apical nodes occupy the superior part of the axilla near the first rib and axillary vessels.

They receive lymph from other axillary groups and from lymphatic vessels accompanying the cephalic vein.

Subclavian Lymphatic Trunk

Efferent vessels from the apical axillary nodes form the subclavian lymphatic trunk.

This trunk returns lymph from the upper limb and associated territories toward the central venous circulation.

Right Subclavian Trunk

The right subclavian trunk may enter the right lymphatic duct, join another lymphatic trunk, or drain independently near the right venous angle.

Left Subclavian Trunk

The left subclavian trunk commonly joins the thoracic duct or drains independently near the left venous angle.

Upper Limb Drainage Pathway

A simplified pathway is:

Upper limb tissues → Superficial/deep lymphatics → Cubital or axillary nodes → Apical axillary nodes → Subclavian trunk → Central lymphatic duct or venous angle

Lower Limb Lymphatic Drainage

The lower limb contains extensive superficial and deep lymphatic networks.

Superficial lymphatic vessels generally follow the great and small saphenous veins, while deep vessels accompany the major arteries and deep veins.

Superficial Lower Limb Lymphatics

Superficial lymphatics begin in the foot and ascend through the subcutaneous tissue of the leg and thigh.

They can be divided broadly into pathways accompanying the great saphenous vein and pathways accompanying the small saphenous vein.

Great Saphenous Pathway

Most superficial lymphatic vessels of the lower limb accompany the great saphenous vein.

They ascend along the medial leg and thigh toward the superficial inguinal lymph nodes.

Small Saphenous Pathway

Some superficial lymphatic vessels from the lateral foot and posterolateral leg accompany the small saphenous vein.

These vessels commonly drain first into the popliteal lymph nodes.

Lymphatics of the Foot

The foot contains superficial and deep lymphatic networks associated with the plantar and dorsal tissues.

Superficial lymphatics communicate extensively and converge toward vessels ascending with the saphenous veins.

Medial Foot Drainage

Superficial lymphatics from much of the medial foot accompany the great saphenous venous pathway toward superficial inguinal nodes.

Lateral Foot Drainage

Superficial lymphatics from the lateral foot commonly follow the small saphenous vein toward the popliteal nodes.

Efferent vessels from the popliteal nodes then continue toward deep inguinal nodes.

Popliteal Lymph Nodes

The popliteal lymph nodes lie within the popliteal fossa in association with the popliteal vessels.

They receive lymph from deep structures of the leg and from superficial vessels accompanying the small saphenous vein.

Popliteal Node Drainage

Efferent vessels from the popliteal nodes accompany the femoral vessels proximally.

They drain predominantly toward the deep inguinal lymph nodes.

Deep Lower Limb Lymphatics

Deep lymphatic vessels accompany the anterior tibial, posterior tibial, fibular, popliteal, and femoral vessels.

They drain deep structures including muscles, bones, joints, and deep fascial compartments.

Inguinal Lymph Nodes

The inguinal lymph nodes are the principal regional lymph nodes for the lower limb.

They are divided into superficial and deep groups.

Superficial Inguinal Nodes

The superficial inguinal nodes lie in the superficial fascia inferior to the inguinal ligament.

They are arranged around the terminal portion of the great saphenous vein and nearby superficial vessels.

Superficial Inguinal Node Territories

In addition to most superficial lymphatics of the lower limb, superficial inguinal nodes receive lymph from the lower anterior abdominal wall, buttock, superficial perineum, external genital regions, and anal canal below the pectinate line.

Horizontal and Vertical Groups

The superficial inguinal nodes are sometimes described as forming horizontal and vertical groups.

The horizontal group lies approximately parallel to the inguinal ligament, while the vertical group follows the terminal great saphenous vein.

Vertical Superficial Inguinal Nodes

The vertical group is particularly associated with lymphatic drainage from the superficial tissues of the lower limb.

Deep Inguinal Lymph Nodes

The deep inguinal nodes lie deep to the fascia lata along the medial side of the femoral vein.

They receive lymph from deep lower limb pathways, popliteal nodes, and efferent vessels from superficial inguinal nodes.

Cloquet Node

The highest deep inguinal node, located near the femoral canal, is often called the node of Cloquet.

It lies near the transition between the deep inguinal and external iliac lymphatic pathways.

External Iliac Nodes

Efferent vessels from the deep inguinal nodes pass superiorly toward the external iliac lymph nodes.

These nodes lie along the external iliac vessels within the pelvis.

Common Iliac and Lumbar Pathways

Lymph from the external iliac nodes passes toward common iliac nodes and subsequently toward lumbar lymph nodes.

Efferent vessels from the lumbar nodes contribute to the lumbar lymphatic trunks.

Lumbar Lymphatic Trunks

The right and left lumbar trunks carry lymph from the lower limbs, pelvis, posterior abdominal wall, and several abdominal organs.

They contribute to the beginning of the thoracic duct, often through the cisterna chyli.

Lower Limb Drainage Pathway

A generalized pathway is:

Lower limb tissues → Superficial/deep lymphatics → Popliteal or inguinal nodes → External iliac nodes → Common iliac nodes → Lumbar nodes → Lumbar trunks → Thoracic duct

Comparison of Upper and Lower Limb Drainage

Feature	Upper Limb	Lower Limb
Main superficial venous guides	Cephalic and basilic veins	Great and small saphenous veins
Intermediate nodes	Cubital nodes	Popliteal nodes
Main regional nodes	Axillary nodes	Inguinal nodes
Major terminal trunk	Subclavian trunk	Lumbar trunks after iliac and lumbar nodes

Relationship Between Superficial Veins and Lymphatics

The association between superficial veins and lymphatic vessels provides useful anatomical landmarks.

In the upper limb, lymphatics commonly follow the basilic and cephalic veins. In the lower limb, major superficial pathways follow the great and small saphenous veins.

Relationship Between Deep Vessels and Lymphatics

Deep lymphatic vessels travel with deep arteries and veins.

This arrangement allows lymph from muscles, joints, bones, and other deep structures to converge along major neurovascular pathways.

Lymphatic Valves

Collecting lymphatic vessels contain valves that promote one-way movement of lymph toward central lymphatic channels.

These valves divide vessels into functional segments that assist lymph propulsion.

Skeletal Muscle Pump

Contraction of limb muscles compresses lymphatic vessels and helps propel lymph proximally.

Valves reduce backward flow when external compression is released.

Respiratory Influence

Changes in thoracic and abdominal pressure during respiration contribute to lymph movement toward the thoracic cavity.

This mechanism becomes increasingly important as peripheral lymph reaches larger central lymphatic channels.

Lymphatic Pumping

Collecting lymphatic vessels contain smooth muscle capable of rhythmic contraction.

This intrinsic activity works with skeletal muscle movement, arterial pulsation, and pressure changes to promote lymph flow.

Clinical Examination

Several regional lymph node groups associated with the limbs can be assessed by physical examination.

Axillary and inguinal nodes are routinely examined, while cubital and popliteal nodes may also be evaluated when clinically relevant.

Lymphadenopathy

Lymphadenopathy refers to abnormal enlargement or alteration of lymph nodes.

Regional nodes may enlarge in response to infection, inflammation, malignancy, or other processes within their drainage territories.

Upper Limb Infection

An infection of the hand or forearm can spread through superficial lymphatic vessels toward cubital or axillary lymph nodes.

The precise nodal response depends on the anatomical site and lymphatic pathway involved.

Lower Limb Infection

Infection of the foot or leg can spread toward popliteal or inguinal nodes.

Lesions in territories draining with the great saphenous pathway commonly involve superficial inguinal nodes.

Lymphangitis

Lymphangitis is inflammation of lymphatic vessels, often associated with infection spreading through superficial lymphatic channels.

Inflamed superficial vessels may produce visible linear erythema extending proximally toward regional lymph nodes.

Lymphedema

Lymphedema develops when lymphatic transport is insufficient to remove interstitial fluid and macromolecules from tissues.

It can affect either the upper or lower limb.

Primary Lymphedema

Primary lymphedema results from developmental abnormalities of lymphatic vessels or nodes.

Its onset and severity vary according to the underlying lymphatic abnormality.

Secondary Lymphedema

Secondary lymphedema results from damage, obstruction, or removal of previously functioning lymphatic pathways.

Potential causes include surgery, radiation, malignancy, trauma, infection, and other acquired processes.

Upper Limb Lymphedema

Upper limb lymphedema can occur when axillary lymphatic pathways are disrupted or obstructed.

This is particularly relevant after selected breast and axillary procedures.

Lower Limb Lymphedema

Lower limb lymphedema may follow disruption or obstruction of inguinal, iliac, pelvic, or retroperitoneal lymphatic pathways.

Because these pathways receive large volumes of lymph from the lower extremity, significant obstruction can produce persistent swelling.

Axillary Node Surgery

Removal or disruption of axillary nodes can reduce lymphatic drainage capacity from the upper limb.

Collateral pathways may compensate to varying degrees, but some individuals develop clinically significant lymphedema.

Inguinal and Pelvic Node Surgery

Surgery involving inguinal or pelvic lymph nodes can interfere with lower limb lymphatic drainage.

The risk depends on the extent and location of lymphatic disruption and individual anatomical variation.

Sentinel Lymph Node Mapping

A sentinel lymph node is the first node or nodal group expected to receive lymph from a specific tissue territory.

Sentinel node techniques can be used in selected malignancies to assess regional lymphatic spread.

Axillary Sentinel Nodes

Axillary sentinel node mapping is commonly associated with evaluation of lymphatic drainage from the breast, but the axillary nodes also represent the major regional lymphatic basin of the upper limb.

Inguinal Sentinel Nodes

Superficial and deep inguinal nodes may serve as regional sentinel nodes for lesions arising from parts of the lower limb and nearby superficial territories.

Malignant Spread

Malignant cells can spread through limb lymphatic vessels toward regional lymph nodes.

Understanding the normal direction of lymph flow helps predict likely nodal pathways from a lesion at a particular anatomical location.

Imaging of Limb Lymphatics

Ultrasound, CT, MRI, lymphoscintigraphy, and specialized lymphatic imaging techniques can evaluate lymph nodes and lymphatic pathways.

The technique chosen depends on the anatomical region and clinical purpose.

Lymphoscintigraphy

Lymphoscintigraphy uses a radiotracer introduced into peripheral tissues to evaluate lymphatic transport and regional nodal drainage.

It can help assess abnormal lymphatic flow in selected patients with lymphedema.

Indocyanine Green Lymphography

Near-infrared imaging after administration of indocyanine green can visualize superficial lymphatic channels.

This technique can demonstrate functional superficial pathways and altered drainage patterns.

Key Upper Limb Drainage Patterns

Territory	Typical Pathway
Medial superficial upper limb	Basilic pathway → Cubital nodes → Axillary nodes
Lateral superficial upper limb	Cephalic pathway → Deltopectoral/apical axillary nodes
Deep upper limb	Deep vessels → Humeral axillary nodes
Terminal upper limb drainage	Apical axillary nodes → Subclavian trunk

Key Lower Limb Drainage Patterns

Territory	Typical Pathway
Most superficial lower limb	Great saphenous pathway → Superficial inguinal nodes
Lateral foot and posterolateral leg	Small saphenous pathway → Popliteal nodes
Deep lower limb	Deep vessels → Popliteal/deep inguinal nodes
Inguinal efferents	External iliac nodes → Common iliac nodes → Lumbar nodes

Key Features of Limb Lymphatic Drainage

Feature	Key Point
Superficial lymphatics	Drain skin and subcutaneous tissue and commonly follow superficial veins
Deep lymphatics	Drain deep structures and accompany deep vessels
Main upper limb nodes	Axillary nodes
Intermediate upper limb nodes	Cubital nodes
Main lower limb nodes	Inguinal nodes
Intermediate lower limb nodes	Popliteal nodes
Upper limb terminal trunk	Subclavian lymphatic trunk
Lower limb central pathway	Iliac nodes → Lumbar nodes → Lumbar trunks → Thoracic duct

Anatomical and Clinical Importance

The lymphatic systems of the upper and lower limbs share a common organization in which superficial vessels follow superficial veins while deep vessels accompany the major arteries and veins. These pathways converge at strategically located regional lymph nodes before lymph returns to the central circulation.

In the upper limb, the axillary nodes form the principal collecting basin, with cubital and deltopectoral nodes serving as intermediate stations for selected superficial pathways. In the lower limb, most superficial lymph passes directly to superficial inguinal nodes, while lymph associated with the small saphenous and deep pathways may first pass through the popliteal nodes.

These drainage patterns are important for understanding regional lymphadenopathy, spread of infection and malignancy, sentinel lymph node mapping, and the development of lymphedema after lymphatic obstruction or surgical disruption.