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Subclavian Vein

Vena subclavia

For medical students2 min readUpdated 2026-10-10

The subclavian vein (vena subclavia) is a large systemic venous channel representing the direct continuation of the axillary vein. It drains deoxygenated blood from the upper extremity and receives vessels from superficial and deep structures of the thoracic and abdominal walls.

Origin boundaryOuter border of the first rib
OriginContinuation of the axillary vein
Major tributaryCephalic vein (*v. cephalica*)

Formation and Topography

Anatomically, the subclavian vein (v. subclavia) does not have a distinct microcapillary origin because it serves as the direct continuation of the axillary venous trunk.

The precise anatomical landmark where the axillary vein changes its name to the subclavian vein is the outer border of the first rib. From this point, the venous trunk courses medially to contribute to the superior vena cava system.

Deep Companion Veins

The tributaries preceding the subclavian vein include deep veins accompanying the branches of the axillary artery. They form paired companion veins (vv. comitantes) that drain deep tissues of the shoulder girdle and chest wall. These include:

Superficial Veins of the Chest and Abdominal Walls

Blood from the skin and subcutaneous tissue of the trunk drains via an extensive superficial venous network that ultimately converges toward the axilla and the subclavian vein.

A key role is played by the thoracoepigastric veins (vv. thoracoepigastricae), which originate in the lateral regions of the thoracic and abdominal walls. Ascending along the lateral chest wall, they enter the axillary fossa. Inferiorly, these vessels form important anastomoses with the superficial epigastric vein (v. epigastrica superficialis).

The lateral thoracic vein (v. thoracica lateralis) also collects blood from superficial structures, receiving:

  1. Veins of the areolar venous plexus (plexus venosus areolaris) surrounding the nipple.
  2. Veins draining the serratus anterior muscle. These vessels form extensive anastomoses with the upper 6–7 posterior intercostal veins. Occasionally, they drain directly into the thoracoepigastric vein rather than the lateral thoracic vein.

Superficial Veins of the Upper Extremity

Venous drainage from the upper limb, which eventually feeds into the subclavian vein, is carried by major superficial trunks. Dissection of the arm reveals the following primary superficial pathways:

The topography of these veins is closely related to fascial landmarks, including the deltoid fascia (fascia deltoidea), pectoral fascia (fascia pectoralis), brachial fascia (fascia brachii), and antebrachial fascia (fascia antebrachii).

Mnemonic

To remember upper limb superficial veins: "The Cephalic travels to the cranium (laterally and superiorly toward the clavicle), while the Basilic is baseline (medially)."

Frequently asked questions

Which vein does the subclavian vein join, and what vessel is formed as a result?

The subclavian vein merges with the internal jugular vein (v. jugularis interna) to form the brachiocephalic vein (v. brachiocephalica).

Key features of this junction:

  • Location: Posterior to the sternoclavicular joint.
  • Anatomical landmark: The confluence of these two major vessels is termed the venous angle (Pirogov's angle).
What anatomical structures lie anterior to the subclavian vein?

The sternoclavicular joint (articulatio sternoclavicularis) lies anterior to the subclavian vein; the vein courses posterior to its articular surface.

Additionally, the subclavian vein travels through the scalene interval anteriorly (spatium ante scalenum), anterior to the attachment of the anterior scalene muscle (m. scalenus anterior).

Does the subclavian vein possess valves, and where are they located?

The subclavian vein contains a bicuspid valve apparatus.

Localization:

  • Positioned directly at the termination of the vessel within the venous angle, where the subclavian vein joins the internal jugular vein (v. jugularis interna) to form the brachiocephalic vein.
Into which vein does the cephalic vein (*v. cephalica*) directly drain after passing through the infraclavicular fossa?

The cephalic vein (v. cephalica) drains directly into the axillary vein (v. axillaris).

Topography of its terminal segment:

  • Course: Travels toward the infraclavicular fossa (fossa infraclavicularis).
  • Deep penetration: Dives deep inferior to the clavicle.
  • Fascial relation: Pierces the medial portion of the clavipectoral fascia (fascia clavipectoralis) before emptying into the axillary vein.
Where does the axillary vein end and the subclavian vein begin?

The anatomical landmark for the transition from the axillary to the subclavian vein is the outer border of the first rib.

Where does venous drainage from the breast primarily flow?

Blood from the superficial areolar venous plexus drains into the lateral thoracic vein.

Which veins are connected by the median cubital vein?

The median cubital vein (v. mediana cubiti) forms an anastomosis between the cephalic (v. cephalica) and basilic (v. basilica) veins.

Go deeper

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