THE CAROTID BODY: A PATHOLOGIST'S VIEW.

Area of Science:

• Neuroscience
• Histology
• Embryology

Background:

• The origin and function of the carotid body remain debated.
• Existing literature presents conflicting interpretations of embryological, histological, and histochemical data.

Purpose of the Study:

• To critically review the literature on carotid body histogenesis and function.
• To propose a revised classification for the carotid body based on current evidence.

Main Methods:

• Literature review of embryological, histological, histochemical, and electron microscopic studies.
• Analysis of tumor morphology and biochemical data (catecholamines).

Main Results:

• Evidence supporting a mesodermal origin and sensory function is unconvincing.
• Morphological and biochemical similarities suggest a relationship with the adrenal medulla and paraganglia.
• Contradictory findings exist regarding its sensory chemoreceptor role.

Conclusions:

• The carotid body likely originates from ectoderm, not mesoderm.
• It should be reclassified as a gland of internal secretion, similar to the adrenal medulla.