Gland
Pyramidal lobe of the thyroid
Optional superior extension of functioning thyroid tissue
High-yield
A pyramidal lobe is a normal anatomical variant. Its position and length vary, and its absence on a scan does not necessarily prove anatomical absence.
Overview
A pyramidal lobe rises from the isthmus or adjacent medial thyroid lobe, often left of the midline. It reflects persistence along the thyroid's embryonic descent pathway. A fibrous or muscular band may connect its upper end toward the hyoid, but neither structure is universal.
Reference facts
- Location
- Projects upward from the isthmus or medial part of a lobe toward the hyoid region, with variable attachment and extent.
- Hormones
- Its follicles can produce T4 and T3.
- Blood supply
- Thyroid arterial branches, commonly from the superior thyroid system.
- Innervation
- Autonomic fibers accompany the regional thyroid vessels.
- Function
- Adds thyroid tissue without a separate hormonal role; its shape records variation in thyroid development.
Clinical correlation
Residual functioning pyramidal tissue can matter when complete thyroid removal is intended. It is distinct from a thyroglossal duct cyst, although both relate to the gland's developmental pathway.
Frequently asked questions
Where is the pyramidal lobe of the thyroid located?
The pyramidal lobe of the thyroid lies projects upward from the isthmus or medial part of a lobe toward the hyoid region, with variable attachment and extent.
What does the pyramidal lobe of the thyroid secrete?
Its follicles can produce T4 and T3.
What does the pyramidal lobe of the thyroid do?
Adds thyroid tissue without a separate hormonal role; its shape records variation in thyroid development.
What is the blood supply of the pyramidal lobe of the thyroid?
The pyramidal lobe of the thyroid is supplied by the thyroid arterial branches, commonly from the superior thyroid system.