External jugular vein

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Here is a comprehensive overview of the external jugular vein based on Gray's Anatomy for Students, the Color Atlas of Human Anatomy, and Roberts & Hedges' Clinical Procedures in Emergency Medicine.

External Jugular Vein

Formation

The external jugular vein (EJV) is formed posterior to the angle of the mandible by the union of two veins:

Posterior auricular vein - drains the scalp behind and above the ear
Posterior division of the retromandibular vein - the retromandibular vein itself is formed in the substance of the parotid gland when the superficial temporal and maxillary veins join; its posterior division combines with the posterior auricular vein to form the EJV

(The anterior division of the retromandibular vein, by contrast, joins the facial vein to form the common facial vein, which drains into the internal jugular vein.)

Gray's Anatomy for Students, p. 1143

Course

Once formed, the EJV descends straight down the neck in the superficial fascia, lying entirely superficial to the sternocleidomastoid (SCM) muscle, crossing it diagonally as it descends.
It enters the posterior triangle of the neck after crossing the SCM.
In the lower neck, just superior to the clavicle and immediately posterior to the SCM, it pierces the investing layer of cervical fascia.
It passes deep to the clavicle and terminates by entering the subclavian vein (occasionally into the internal jugular vein near the venous angle).
Gray's Anatomy for Students, p. 1143; Color Atlas of Human Anatomy, p. 132

Tributaries

Along its descent, the EJV receives:

Tributary	Drainage area
Posterior external jugular vein	Superficial areas of the back of the neck
Transverse cervical vein	Posterior scapular region
Suprascapular vein	Posterior scapular region
Anterior jugular vein (sometimes)	Anterior neck; occasionally drains into EJV just before it enters the subclavian

Gray's Anatomy for Students, p. 1144

Relations

Lies in the superficial fascia, superficial to the SCM throughout
Covered by platysma
Pierces the investing (deep cervical) fascia just above the clavicle, which can cause air embolism risk during neck procedures or catheterization
The anterior jugular veins may communicate with the EJV via the jugular venous arch in the suprasternal notch region

Valves

The EJV contains valves near its termination at the subclavian vein. These prevent backflow from the subclavian into the superficial system - Scott-Brown's Otorhinolaryngology Head and Neck Surgery.

Clinical Relevance

1. Jugular Venous Pressure (JVP)

The EJV is visible superficially on the neck and is used to estimate venous pressure. Distension at rest or elevation of the venous column suggests raised central venous pressure (e.g., right heart failure, cardiac tamponade, superior vena cava obstruction).

2. Peripheral IV Cannulation

In patients with limited peripheral venous access, the EJV can be cannulated as a peripheral vein:

Place patient in Trendelenburg position to fill the vein
Rotate head to the opposite side
Align cannula toward the ipsilateral shoulder
Puncture midway between the angle of the jaw and the midclavicular line
Lightly compress above the clavicle with a free finger to act as a tourniquet
Roberts and Hedges' Clinical Procedures in Emergency Medicine

3. Central Venous Access via EJV

The EJV can also be used for central venous catheterization, but this is technically difficult:

Requires passage of a guidewire into the thorax
Advancement of the wire is the most challenging step due to the angle at which the EJV meets the subclavian
A small-radius J-tipped wire, distended lumen, exaggerated head tilt, and skin traction improve success
Time-consuming; less preferred in emergencies compared to internal jugular or subclavian routes

4. As a Surgical Landmark

In neck surgery, the EJV serves as a landmark; for example, the subclavian vein puncture site is near where the EJV crosses the posterolateral border of the SCM. Surgeons take care not to injure it during dissection of the anterior triangle and subplatysmal plane.

Summary Table

Feature	Detail
Formed by	Posterior auricular v. + posterior division of retromandibular v.
Location	Superficial fascia, crosses SCM obliquely
Terminates in	Subclavian vein (or occasionally internal jugular)
Covered by	Platysma
Pierces	Investing cervical fascia above the clavicle
Key tributaries	Posterior external jugular, transverse cervical, suprascapular, anterior jugular
Clinical uses	JVP assessment, peripheral IV access, central venous access (difficult)

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