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The internal jugular vein is a paired jugular vein that collects blood from the brain and the superficial parts of the face and neck. This vein runs in the carotid sheath with the common carotid artery and vagus nerve. It begins in the posterior compartment of the jugular foramen, at the base of the skull.
The internal jugular vein is formed by the anastomosis of blood from the sigmoid sinus of the dura mater and the inferior petrosal sinus. The internal jugular runs with the common carotid artery and vagus nerve inside the carotid sheath. It provides venous drainage for the contents of the skull.
The sigmoid sinus is a dural venous sinus situated within the dura mater.The sigmoid sinus receives blood from the transverse sinuses, which track the posterior wall of the cranial cavity, travels inferiorly along the parietal bone, temporal bone and occipital bone, and converges with the inferior petrosal sinuses to form the internal jugular vein.
The carotid sheath is a condensation of the deep cervical fascia [1]: 578 enveloping multiple vital neurovascular structures of the neck, [2] including the common and internal carotid arteries, the internal jugular vein, the vagus nerve (CN X), and ansa cervicalis. [1]: 578 [2] The carotid sheath helps protects the structures contained therein. [2]
The right lymphatic duct forms various combinations with the right subclavian vein and right internal jugular vein. [2] [3] It is approximately 1.25 cm long.
The walls of the dural venous sinuses are composed of dura mater lined with endothelium, a specialized layer of flattened cells found in blood and lymph vessels.They differ from other blood vessels in that they lack a full set of vessel layers (e.g. tunica media) characteristic of arteries and veins.
The lingual veins are multiple veins of the tongue with two distinct courses: one group drains into the lingual artery; another group drains either into the lingual artery, (common) facial vein, or internal jugular vein. [1]
Typically, there are two trunks - one on each side of the body. The right bronchomediastinal trunk may connect the right lymphatic duct, and the left trunk to the thoracic duct, [1] although more frequently, they open independently into the junction of the internal jugular vein and subclavian veins on their respective sides.