Cerumen Production and Characteristics

Composition and Production

• Cerumen forms when glandular secretions from the outer two-thirds of the ear canal mix with exfoliated squamous epithelial cells, according to the American Academy of Otolaryngology-Head and Neck Surgery 1, 2

Glandular Components

• Sebaceous glands produce sebum, which contributes oily secretions to the cerumen mixture, as stated by the American Academy of Otolaryngology-Head and Neck Surgery 3, 4
• Modified apocrine sweat glands (also called ceruminous glands) provide additional secretions that combine with the sebum, as reported by the American Academy of Otolaryngology-Head and Neck Surgery 1, 2, 3

Cellular Components

• Sloughed epithelial cells from the cornified stratum of the external auditory canal epithelium mix with the glandular secretions, according to the American Academy of Otolaryngology-Head and Neck Surgery 3
• As cerumen migrates laterally through the ear canal's natural self-cleaning mechanism, it may incorporate hair and other particulate matter, as stated by the American Academy of Otolaryngology-Head and Neck Surgery 1, 3

Location of Production

• Cerumen is produced exclusively in the outer two-thirds (cartilaginous portion) of the external auditory canal, not the inner third (bony portion) that ends at the tympanic membrane, as reported by the American Academy of Otolaryngology-Head and Neck Surgery 1, 2

Protective Functions

• The resulting cerumen serves as a naturally occurring substance that cleans, protects, and lubricates the external auditory canal, according to the American Academy of Otolaryngology-Head and Neck Surgery 3, 4

Normal Characteristics

• Normal cerumen color varies from light yellow to dark brown or black depending on individual variation, as stated by Praxis Medical Insights 5
• The mixture undergoes natural migration outward from the ear canal through a self-cleaning mechanism, as reported by the American Academy of Otolaryngology-Head and Neck Surgery 1, 2