Development of Tongue

Dr. Sherif Fahmy

Derivatives of Floor of Phayngeal Gut
Dr. Sherif Fahmy

Development of Tongue

Tongue is developed at the floor of pharynx. Mucosa of tongue is developed from endodermal cells at floor of pharynx opposite 1st, 2nd and 3rd pharyngeal arches. Muscles of tongue are developed from mesoderm of occipital myotomes.
Dr. Sherif Fahmy

Dr. Sherif Fahmy

Dr. Sherif Fahmy

Dr. Sherif Fahmy

Development of Mucosa of Tongue

Dr. Sherif Fahmy

Dr. Sherif Fahmy

Muscles of Tongue
Lingual muscles are developed from occipital myotomes (2nd, 3rd and 4th myotomes). These myotomes migrate ventrally superficial to external and intrnal carotid arteries. Hypoglossal nerve follows occiptal myotomes to enter developing mucosa of tongue.
Dr. Sherif Fahmy

Nerve Supply of Tongue

Anterior 2/3 of mucosa: is supplied by lingual nerve for general sensations and chorda tympani for taste. Posterior 1/3 of mucosa: is supplied by glossopharyngeal nerve for general sensation and taste. Muscles of tongue are supplied by hypoglossal nerve.
Dr. Sherif Fahmy

Anomalies of Tongue

1- Aglossia: Complete absence of tongue. 2- Microglossia: Small sized tongue. 3- Macroglossia: Large sized tongue. 4- Bifid tongue: due to failure of fusion between 2 lingual swellings. 5- Tongue tie: short frenulum due to defective formation of linguo-gingival groove. .
Dr. Sherif Fahmy