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v jugularis interna
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The fascia and middle thyroid veins (Internal jugular visible at center left)
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Veins of the Tongue The Hypoglossal Nerve has been displaced downward in this preparation (Internal jugular visible at bottom left)
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Jugular+Veins
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The collects the blood from the
Brain , from the superficial parts of the
Face , and from the
Neck .
It is directly continuous with the
Transverse Sinus , and begins in the posterior compartment of the
Jugular Foramen , at the base of the
Skull .
At its origin it is somewhat dilated, and this dilatation is called the ''superior bulb''.
It runs down the side of the neck in a vertical direction, lying at first lateral to the
Internal Carotid Artery , and then lateral to the
Common Carotid , and at the root of the neck unites with the
Subclavian Vein to form the
Innominate Vein ; a little above its termination is a second dilatation, the ''inferior bulb''.
Above, it lies upon the
Rectus Capitis Lateralis , behind the internal carotid artery and the nerves passing through the jugular foramen; lower down, the vein and artery lie upon the same plane, the
Glossopharyngeal and
Hypoglossal nerves passing forward between them; the
Vagus descends between and behind the vein and the artery in the same sheath, and the
Accessory runs obliquely backward, superficial or deep to the vein.
At the root of the neck the right internal jugular vein is placed at a little distance from the
Common Carotid Artery , and crosses the first part of the
Subclavian Artery , while the
Left Internal Jugular Vein usually overlaps the common carotid artery.
The left vein is generally smaller than the right, and each contains a pair of valves, which are placed about 2.5 cm. above the termination of the vessel.
