| inferior horn of thyroid cartilage | One of the pair of downward prolongations at the back of the thyroid cartilage; it articulates on each side with the cricoid cartilage. Synonym: cornu inferius cartilaginis thyroideae. (05 Mar 2000) |
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| inferior thyroid artery | <anatomy, artery> Origin, terminal branch of thyrocervical trunk (with ascending cervical artery); branches, inferior laryngeal, and muscular, oesophageal, and tracheal. Synonym: arteria thyroidea inferior. (05 Mar 2000) |
| inferior thyroid notch | A shallow notch in the middle of the lower border of the thyroid cartilage. Synonym: incisura thyroidea inferior. (05 Mar 2000) |
| inferior thyroid plexus | An autonomic plexus on the artery of this name, derived from the subclavian plexus. Synonym: plexus thyroideus inferior. (05 Mar 2000) |
| inferior thyroid tubercle | A slight lateral projection from the lower margin of the lamina of the thyroid cartilage on either side, at the inferior end of the oblique line. Synonym: tuberculum thyroideum inferius. (05 Mar 2000) |
| inferior thyroid vein | <anatomy, vein> Unpaired vein formed by veins from the isthmus and lateral lobe of the thyroid gland and from the plexus thyroideus impar; it terminates in the left brachiocephalic vein. Synonym: vena thyroidea inferior, vena thyroidea ima. (05 Mar 2000) |
| infrahyoid branch of superior thyroid artery | <anatomy, artery> Small branch from the initial part of the superior thyroid artery coursing along the hyoid bone deep to the thyrohyoid muscle to anastomose with its contralateral partner. Synonym: ramus infrahyoideus arteriae thyroidea superioris. (05 Mar 2000) |
| isthmus of thyroid | The central part of the thyroid gland joining the two lateral lobes. Synonym: isthmus glandulae thyroideae. (05 Mar 2000) |
| oblique line of thyroid cartilage | A ridge on the outer surface of the thyroid cartilage that gives attachment to the sternothyroid and thyrohyoid muscles. Synonym: linea obliqua cartilaginis thyroidea. (05 Mar 2000) |
| oesophageal branches of the inferior thyroid artery | <anatomy, artery> Distribution: upper one-quarter of oesophagus; anastomosis: oesophageal branches of thoracic aorta. Synonym: rami oesophageales arteriae thyroideae inferioris. (05 Mar 2000) |
| ectopic thyroid | <radiology> Usually connects to normal thyroid, sites: lingual thyroid, thyroglossal duct remnant, anterior mediastinum (retrosternal thyroid), btw trachea and oesophagus, struma ovarii (teratoma variant), use pertechnetate first (rather than I-131) because of lower dose (12 Dec 1998) |
| thyroid | A butterfly-shaped endocrine gland in the neck that is found on both sides of the trachea (windpipe). It secretes the hormone thyroxine which controls the rate of metabolism. (27 Sep 1997) |
| thyroid acropachy | <radiology> Periosteal reaction, metacarpals, long bones of lower limbs, pretibial myxoedema, exophthalmos, prob secondary to long-standing exposure to LATS, 0.5 - 10% of patients after thyroidectomy for thyrotoxicosis (12 Dec 1998) |
| thyroid axis | A short arterial trunk arising from the subclavian artery, giving rise to the suprascapular (which may instead arise directly from the subclavian artery) and terminating by dividing into the ascending cervical and inferior thyroid arteries. Synonym: truncus thyrocervicalis, thyroid axis. (05 Mar 2000) |
| thyroid binding globulin | <protein> Thyroid binding globulin (TBG) is a plasma protein which binds the majority of thyroid hormone in the bloodstream. Bound thyroid hormone is inactive, only the unbound fraction (0.3%) is considered active. Birth control pills and pregnancy can lead to increased TBG levels in the plasma. Androgens can decrease TBG levels in the plasma. (27 Sep 1997) |