Illustrated Encyclopedia of Human Anatomic Variation: Opus IV: Organ Systems
Ronald A. Bergman, PhD
Adel K. Afifi, MD, MS
Ryosuke Miyauchi, MD
Peer Review Status: Internally Peer Reviewed
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1 |
Absence of thyroid isthmus. Lateral lobes each have pyramidal lobes |
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Pyramidal lobe arising from the union of the left lobe at the isthmus |
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3 |
Pyramidal lobe arising from the isthmus of the gland |
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4 |
Accessory thyroids may be located on the trachea, thyroid cartilage, thyrohyoid muscle, geniohyoid muscle, and hyoid bone, under and above the hyoid bone |
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Accessory thyroid gland on cricothyroid muscle. Pyramidal lobe reduced to left interior part of the isthmus |
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Persistent thyroglossal duct in an adult, originating at the foramen cecum of the tongue |
Redrawn from various sources.
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