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The Thyroid Gland

The Thyroid Gland

The thyroid gland is a small, butterfly-shaped gland located in the neck and covers the anterior surface of the trachea. The gland has two lateral lobes connected by a thin tissue mass called the isthmus. Internally, each lobe comprises many small spherical structures known as thyroid follicles, surrounded by a network of blood vessels.
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Hyperthyroidism is a hypermetabolic state caused by elevated levels of thyroid hormones, triiodothyronine (T3) and thyroxine (T4). It results from dysregulation at the thyroid, pituitary, or immune system level and affects multiple organ systems.PathophysiologyThe most common cause of hyperthyroidism is Graves’ disease, an autoimmune disorder in which antibodies, specifically thyroid-stimulating antibodies (TSAb), a subtype of TSH receptor antibodies (TRAb), bind to and activate TSH receptors...

The Parathyroid Glands

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Related Experiment Video

Updated: Jun 15, 2026

An Ex vivo Culture System to Study Thyroid Development

An Ex vivo Culture System to Study Thyroid Development

Published on: June 6, 2014

The thyroid gland and its variations: a cadaveric study.

S D Joshi¹, S S Joshi, S R Daimi

¹Department of Anatomy, Rural Medical College, PIMS, Loni, Dist-Ahmednagar, Maharashtra, India.

Folia Morphologica

|March 18, 2010

Summary

This summary is machine-generated.

This study details thyroid gland variations in 90 male cadavers, noting lobe dimensions, pyramidal lobe presence (37.77%), levator glandulae thyroideae (30%), and isthmus absence (16.66%). Such anatomical knowledge is crucial for thyroid surgery and tracheostomy procedures.

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Area of Science:

Anatomy
Surgical Anatomy
Embryology

Background:

Thyroid gland anatomy exhibits significant variation.
Numerous common and rare thyroid anomalies are documented in scientific literature.
Understanding these variations is essential for clinical practice.

Purpose of the Study:

To investigate the anatomical variations of the thyroid gland in adult male cadavers.
To document the prevalence of specific thyroid gland anomalies, including the pyramidal lobe, levator glandulae thyroideae, and variations in the isthmus.
To correlate observed variations with potential developmental origins.

Main Methods:

Gross dissection of 90 male cadavers aged 60-75 years.
Measurement of thyroid lobe length, width, and thickness.
Documentation of the presence/absence and characteristics of the pyramidal lobe, levator glandulae thyroideae, and isthmus.
Assessment of the isthmus's relationship with the upper tracheal rings.

Main Results:

Average lobe length: Right 4.32 cm, Left 4.22 cm; Average lobe thickness: Right 1.13 cm, Left 1.18 cm.
Pyramidal lobe observed in 37.77% of cases, often from the left lobe.
Levator glandulae thyroideae present in 30% of cases, typically attached to the hyoid bone.
Thyroid isthmus absent in 16.66% of cases, with variable tracheal ring relationships.

Conclusions:

Significant anatomical variations of the thyroid gland exist in the studied male population.
The prevalence of specific structures like the pyramidal lobe and levator glandulae thyroideae highlights individual anatomical diversity.
Accurate knowledge of thyroidal variations is vital for successful thyroidectomies and tracheostomies, minimizing surgical risks.