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Overview_of_the_Neck_and_Thyroid_Gland - Overview of the...

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Overview of the Neck and Thyroid Gland The neck is a transitional zone between the head and the trunk and upper extremity. It contains a skeletal axis consisting of 7 cervical vertebrae, two tubes – a digestive tube consisting of the pharynx and esophagus posteriorly, and a respiratory tube consisting of the larynx and trachea anteriorly. Lateral to these two tubes are the major blood vessels, the common carotid artery and internal jugular vein. Anterior to the respiratory tube are two glands, the thyroid and parathyroids. The neck is divided into two triangles: anterior and posterior cervical triangles. They are separated from each other by the sternocleidomastoid muscle (SCM). The subdivisions of the anterior triangle are: the muscular triangle, the submandibular triangle, the submental triangle, and the carotid triangle. The submandibular triangle contains the submandibular gland, submandibular lymph nodes, the facial artery and the hypoglossal nerve (CN XII). The submental triangle contains the submental lymph nodes. The carotid triangle contains the carotid sheath which covers the internal jugular vein, common carotid artery and its bifurcation, and vagus nerve. The vagus nerve lies between and posterior to the common carotid artery and the internal jugular vein. The bifurcation of the common carotid artery commonly occurs at the level of the superior border of the thyroid cartilage (between C3 and C4). Located at the bifurcation of the common carotid artery are the Carotid Sinus (baroreceptor) and Carotid body (chemoreceptor). The hypoglossal nerve occasionally loops superficially across the carotid triangle. The muscular triangle contains the strap (infrahyoid: sternohyoid, sternothyroid and thyrohyoid) muscles of the neck and the thyroid and parathyroid glands. The posterior triangle is subdivided into the occipital triangle and the subclavian (omoclavicular, supraclavicular) triangle by the inferior belly of the omohyoid muscle. The posterior triangle contains important nerves and blood vessels.
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  • Fall '10
  • Dr.Laird
  • Internal carotid artery, Common carotid artery, Subclavian artery, Arteries of the head and neck, Internal jugular vein

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Overview_of_the_Neck_and_Thyroid_Gland - Overview of the...

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