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This is a good article. Follow the link for more information. The human thyroid as viewed from the front, with arteries visible. The thyroid as it relates to surface anatomy of the neck and torso. The hormones also have many other effects including those on development. This image shows a variant thyroid with a pyramidal lobe emerging from the middle of the thyroid. The thyroid gland is a butterfly-shaped organ that sits at the front of the neck.
It is composed of two lobes, left and right, connected by a narrow isthmus. 5 cm long, 3 cm wide and 2 cm thick, and the isthmus about 1. 25 cm in height and width. The gland is usually larger in women, and increases in size in pregnancy. This causes the thyroid to move up and down with swallowing. The trachea, laryngx, lower pharynx and esophagus all lie behind the thyroid. The superior thyroid artery splits into anterior and posterior branches supplying the thyroid, and the inferior thyroid artery splits into superior and inferior branches.
The superior and inferior thyroid arteries join together behind the outer part of the thyroid lobes. Both arteries and veins form a plexus between the two layers of the capsule of the thyroid gland. When present, this lobe often stretches up the hyoid bone from the thyroid isthmus and may be one to several divided lobes. The presence of this lobe ranges in reported studies from 18. It was shown to more often arise from the left side and occasionally separated. Section of a thyroid gland under the microscope. Thyroid follicles are small spherical groupings of cells 0.