What is the shape of the epiglottis in neonates?

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Last updated: March 14, 2026 • View editorial policy

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Shape of the Epiglottis in Neonates

The neonatal epiglottis has a conical shape that is narrower and more tubular than the broader, leaf-shaped adult epiglottis. 1

Anatomical Characteristics

The conical configuration of the infant epiglottis serves specific physiological functions during early development:

  • The conical shape is part of a protective, partially closed laryngeal entrance that is adaptive to suckling. 1
  • This narrow, tubular morphology differs markedly from the mature adult epiglottis, which widens as the child grows. 1
  • Maturational widening of the epiglottic opening occurs to accommodate the growing respiratory demands of increasing physical exertion as the child develops. 1

Positional Features in Neonates

Beyond shape, the neonatal epiglottis occupies a distinct anatomical position:

  • The epiglottis lies on a somewhat horizontal axis in newborns and is partially obscured behind the hyoid bone. 2
  • The hyoid bone overlaps the thyroid cartilage in neonates, partially obscuring the superior thyroid notch and contributing to the unique laryngeal configuration. 2
  • There is marked descent of the epiglottis and other laryngeal structures relative to the cervical spine during the first two years of life. 3

Structural Composition

The tissue characteristics of the neonatal epiglottis also differ from older children:

  • The newborn epiglottic cartilage is composed of immature elastic cartilage with a sparse elastic fiber component. 2
  • The epiglottic cartilage matures during the first 8 years of life as the larynx descends and the vocal tract develops. 2
  • The covering epithelium of the developing epiglottis stains much darker with hematoxylin than other pharyngeal epithelia, reflecting its unique cellular composition. 4

Clinical Implications

Understanding the conical shape has practical importance during airway assessment:

  • The infant larynx is funnel-shaped overall, with the narrowest portion being the circular or near-circular cricoid cartilage, not the epiglottis. 5
  • During flexible bronchoscopy in neonates, the epiglottis can be examined under physiological conditions via nasal insertion while stridor remains audible. 6
  • The best laryngoscopic view in infants is obtained with the atlanto-occipital joint fully extended and the head and shoulders on a flat surface, accounting for the high laryngeal position and horizontal epiglottic orientation. 3

References

1
Research

Biomechanics of the human epiglottis.

Acta oto-laryngologica, 1979

6
Guideline

Investigations for Suspected Neonatal Laryngeal Anomalies

Praxis Medical Insights: Practical Summaries of Clinical Guidelines, 2026

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