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There are many variants in the size and shape of the thyroid gland, and in the position of the embedded parathyroid glands. [5] Sometimes there is a third lobe present called the pyramidal lobe. [5] When present, this lobe often stretches up to the hyoid bone from the thyroid isthmus and may be one to several divided lobes. [4]
The branches to the gland are generally two in number. One, the larger, supplies principally the anterior surface; on the isthmus of the gland it connects with the corresponding artery of the opposite side. A second branch descends on the posterior surface of the gland and anastomoses with the inferior thyroid artery. Besides the arteries ...
During the third week of development, the thyroid gland begins to develop from the floor of the pharynx. This primordium begins as an evagination between the first and second pharyngeal grooves, relatively where the anterior two-thirds of the tongue ends. [4] This area is known as the foramen cecum and marks the origin of the thyroglossal duct ...
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The thyroid ima artery (thyroidea ima artery, arteria thyroidea ima, thyroid artery of Neubauer or the lowest thyroid artery) is an artery of the head and neck.It is an anatomical variant that, when present, supplies blood to the thyroid gland primarily, or the trachea, the parathyroid gland and the thymus gland (as thymica accessoria) in rare cases.
The thyroid gland also stretches across the upper trachea, with the isthmus overlying the second to fourth rings, and the lobes stretching to the level of the fifth or sixth cartilage. [2] The blood vessels of the thyroid rest on the trachea next to the isthmus; superior thyroid arteries join just above it, and the inferior thyroid veins below ...
Scroll through for common thyroid cancer symptoms: She shared her experience in an effort to raise awareness of the thyroid cancer symptoms after initially not wanting to share on social media
In anatomy, isthmus refers to a constriction between organs. This is a list of anatomical isthmi: Aortic isthmus, section of the aortic arch; Cavo-tricuspid isthmus of the right atrium of the heart, a body of fibrous tissue in the lower atrium between the inferior vena cava, and the tricuspid valve
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