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HA2 (HeadNeckMouthThroatNoseSinus)

The posterior triangle is behind the sternomastoid

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suprasternal notch. The posterior triangle is behind the sternomastoid muscle, with the trapezius muscle on the other side and with its base along the clavicle below. Trapezious: Arise from the occipital bone and the vertebrae and extend fanning out to the scapula and clavicle; moves the shoulders and extend and turn the head. Cervical Vertebrae C1-C7: The cranium is supported by C1 (atlas), C2 (Axis) and down to C7. Vertebra Prominens: Long spinous process that is palpable when the head is flexed. Blood Vessels Internal Jugular Vein: lies beneath sternomastoid muscle
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Carotid arteries: The internal carotid branches off the common carotid and runs inward and upward to supply the brain; the external carotid supplies the face, salivary glands, and superficial temporal area. External Jugular Vein: runs diagonally across the sternomastoid muscle. Thyroid Gland Hyoid Bone: highest part of the thyroid cartilage; palpated high in the neck at the level of the floor of the mouth; Thyroid Cartilage: above the cricoid cartilage, with a small palpable notch in the upper edge; “Adam’s Apple”; Cricoid Cartilage: Just above the thyroid isthmus, upper tracheal ring Thyroid Gland- two lateral lobes: both conical in shape, each curving posteriorly between the trachea and the sternomastoid muscle; connected in the middle by a thin isthmus lying over the 2 nd and 3 rd tracheal rings Lymph Nodes (Receives drainage from…) Preauricular: in front of the ear (scalp, external ear canal, forehead) Postauricular: mastoid; superficial to the mastoid process (parietal region of scalp, external ear canal) Tonsilar: under the angle of the mandible (tonsils, posterior palate, thyroid, mouth floor) Occipital: at the base of the skull (parietal region of scalp) Submandibular: halfway between the angle and the tip of the mandible (tongue, lips)
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