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Penis Anterior Branch

Figure 15.17 Ventral portion of the pharyngeal arches seen from above showing development of the tongue. I to IV, the cut pharyngeal arches. A. 5 weeks (approximately 6 mm). B. 5 months. Note the foramen cecum, site of origin of the thyroid primordium. C and D. Scanning electron micrographs of similar stages of tongue development in human embryos. A depression marks the location of the foramen cecum (arrowheads).

Figure 15.17 Ventral portion of the pharyngeal arches seen from above showing development of the tongue. I to IV, the cut pharyngeal arches. A. 5 weeks (approximately 6 mm). B. 5 months. Note the foramen cecum, site of origin of the thyroid primordium. C and D. Scanning electron micrographs of similar stages of tongue development in human embryos. A depression marks the location of the foramen cecum (arrowheads).

to the anterior two thirds of the tongue is provided by the chorda tympani branch of the facial nerve, while the posterior third is supplied by the glos-sopharyngeal nerve.

CLINICAL CORRELATES Tongue-Tie

In ankyloglossia (tongue-tie) the tongue is not freed from the floor of the mouth. Normally, extensive cell degeneration occurs, and the frenulum is the only tissue that anchors the tongue to the floor of the mouth. In the most common form of ankyloglossia, the frenulum extends to the tip of the tongue.

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