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7 Cards in this Set
- Front
- Back
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Describe the borders of level I. Furthermore, describe the boundaries of IA and IB.
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Level I on each side is the area between the posterior belly of the digastric muscle and the midline, bounded by the hyoid bone inferiorly and the mandible superiorly. Level I is divided into IA bounded by the anterior belly of the digastric muscle, the hyoid bone, and the midline, whereas level IB is bounded by the anterior and posterior bellies of the digastric muscle and the inferior border of the mandible.
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Descibe the borders of Level II. Furthermore, describe the boundaries between levels IIA and IIB.
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Level II is bounded superiorly by the skull base, anteriorly by the stylohyoid muscle, inferiorly by a horizontal plane extending posterior from the hyoid bone, and posteriorly by the posterior edge of the sternocleidomastoid muscle. Level II is further divided into level IIA, which is anterior to the spinal accessory nerve and level IIB or the "submuscular triangle" which is posterior to the nerve.
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Descibe the boundaries of Level III.
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Level III begins at the inferior edge of level II and is bounded by the laryngeal strap muscles anteriorly, the posterior border of the sternocleidomastoid muscle posteriorly, and by a horizontal plane extending posteriorly from the inferior border of the cricoid cartilage.
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Descibe the boundaries of Level IV.
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Level IV begins at the inferior border of level III and is bounded anteriorly by the strap muscles, posteriorly by the posterior edge of the sternocleidomastoid muscle, and inferiorly by the clavicle.
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Descibe the boundaries of Level V.
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Level V is posterior to the posterior edge of the sternocleidomastoid muscle, anterior to the trapezius muscle, superior to the clavicle, and inferior to the base of skull.
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Describe the boundaries of Level VI.
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Level VI is bounded by the hyoid bone superiorly, the common carotid arteries laterally, and the sternum inferiorly. Although level VI is large in area, the few lymph nodes it contains are mostly in the paratracheal regions near the thyroid gland.
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Describe the boundaries of Level VII.
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Level VII (superior mediastinum) lies between the common carotid arteries and is superior to the aortic arch and inferior to the upper border of the sternum.
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