Isthmus of Thyroid Gland

Isthmus of Thyroid Gland The structure indicated is the isthmus of the thyroid gland. The thyroid gland sits anteriorly in the neck, just inferior to the thyroid cartilage. It is located deep to the overlying strap muscles (sternohyoid, sternothyroid and omohyoid). It has two lateral lobes connected in the centre by the isthmus. The isthmus lies over the 2nd and 3rd rings of the trachea The lateral lobes extend from the lateral aspects of the thyroid cartilage down as far the 6th ring of the trachea. Occasionally a pyramidal lobe is present, which is an upward extension of the isthmus, …

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