Veins from the Head Neck and Brain

The external jugular (jug'u-lar) veins drain blood from the face, scalp, and superficial regions of the neck. These vessels descend on either side of the neck, passing over the sternocleidomastoid muscles and beneath the platysma. They empty into the right and ¬°eft subclavian veins in the base of the neck (fig. 15.54).

The internal jugular veins, which are somewhat larger than the external jugular veins, arise from numerous veins and venous sinuses of the brain and from deep veins in various parts of the face and neck. They pass downward through the neck beside the common carotid arteries and also join the subclavian veins. These unions of the internal jugular and subclavian veins form large brachiocephalic (innominate) veins on each side. These vessels then merge in the mediastinum and give rise to the superior vena cava, which enters the right atrium.

Cervical Blood Vessels

Right brachiocephalic v.

Figure

Right brachiocephalic v.

Essentials of Human Physiology

Essentials of Human Physiology

This ebook provides an introductory explanation of the workings of the human body, with an effort to draw connections between the body systems and explain their interdependencies. A framework for the book is homeostasis and how the body maintains balance within each system. This is intended as a first introduction to physiology for a college-level course.

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