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THYROID GLAND

Anatomy-Neck

THYROID GLAND

1. The thyroid gland consists of two symmetrical lobes united in front of 2,3,4 tracheal rings by an isthmus of glandular tissue.
2. Each lateral lobe is pear shaped and consists of upper and lower poles. Each possesses lateral, medial and posterior surfaces.

SURFACES & POLES
3. Lateral surface - under the cover the STERNOTHYROID + STERNOHYOID MUSCLES.
4. Medial surface - lies against the laryx + upper trachea. The cricothyroid + inferior constrictor are medial relations. The external laryngeal n. (branch of superior laryngeal n.) and recurrent laryngeal n. approach it from above and below respectively.
5. Lower pole - extends to the 6th tracheal ring, lies anterior to lower pharynx + upper oesophagus. The inferior thyroid artery and thoracic duct (on the left) arches behind the lower pole.
6. Posterior surface - overlaps the carotid sheath. The parathryoids lie on the posterior surface.


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REFERENCES

1. Mcminn. (2003). Last's Anatomy. Elsevier Australia. ISBN:0729537528. Read it at Google Books - Find it at Amazon
2. Netter, F. H. (2019). Atlas of human anatomy. Philadelphia, PA: Elsevier.
3. Image: no reference available.

Ⓒ A. Manickam 2018

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