・「 The left vein is generally smaller than the right 」（ Wikipedia ）
・「 The mean diameter is 10 mm, but may range between 5 and 35 mm. 」（ Wikipedia ）
・「The vein runs in the carotid sheath （ 頚動脈鞘 ） with the common carotid artery and vagus nerve 」（Wikipedia）
・ 頸静脈下球は内壁に2つの弁を有する。
（ about 2.5 cm above the termination of the vessel ） 「 Wikipedia 」
「 内頚静脈は、上方では内頚動脈の後方に、下方では総頚動脈の外側に沿って下り、… 」（ 日本人体解剖学 ）
「 船戸和弥のHP 」では内頚静脈に合流する静脈として以下の6つの静脈を挙げている。
以下は「 Wikipedia 」の解説文となる。
「 The internal jugular vein is a paired jugular vein that collects blood from the brain and the superficial parts of the face and neck. The vein runs in the carotid sheath with the common carotid artery and vagus nerve.
The internal jugular vein begins in the posterior compartment of the jugular foramen, at the base of the skull.
It is somewhat dilated at its origin, and this dilatation is called the superior bulb.
It also has a common trunk into which drains the anterior branch of the retromandibular vein, the facial vein, and the lingual vein.
It runs down the side of the neck in a vertical direction, being at one end lateral to the internal carotid artery, and then lateral to the common carotid artery, and at the root of the neck, it unites with the subclavian vein to form the brachiocephalic vein (innominate vein); a little above its termination is a second dilatation, the inferior bulb.
【 語 句 】
・ carotid sheath：頚動脈鞘 ・ common carotid artery： ・ vagus nerve： ・ jugular foramen： ・ dilatation：膨張 ・ retromandibular vein： ・ facial vein： ・ lingual vein： ・subclavian vein ： ・ brachiocephalic vein：
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 ( the carotid 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 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.
【 語 句 】
・ rectus capitis lateralis：外側頭直筋 ・ glossopharyngeal nerve：舌咽神経 ・ hypoglossal nerve：舌下神経 ・ overlap：重なる
【 Variation 】
In 9–12% of the Western population, the size, shape or course of the internal jugular vein is abnormal.[1] Variants identified including veins markedly smaller, or not functionally present.[2] The mean diameter is 10 mm, but may range between 5 and 35 mm.[3]
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