Here development of the tongue is fully described

1. Development of tongue

2. DEVELOPMENT
 Appears – 4th week.
It involves
DEVELOPMENT OF MUCOUS MEMBRANE
MUSCLES OF TONGUE
FIBROMUSCULAR STROMA

3. DEVELOPMENT OF THE TONGUE MUSCLES
 Occipital myotomes – formed by the fusion of four
pre –cervical somites
 Supplied by hypoglossal nerve (nerve of occipital myotome)
FIBROMUSCULAR STROMA
 Developed in situ from the mesoderm of the adjacent arches

4. Floor of primitive pharynx

5. DEVELOPMENT OF MUCOUS MEMBRANE
 LINGUAL SWELLINGS
 TUBERCULUM IMPAR
 HYPOBRANCHIAL EMINENCE

8. • Anterior 2/3rd /body - Lateral lingual swellings+ tuberculum impar.
• Posterior part 1/3rd /root – cranial part of copula.
• Sulcus terminalis separate anterior from posterior.
• Posterior most part - 4th arch.
• Muscle - occipital myotomes.

9. NERVE SUPPLY

10. • Motor - hypoglossal nerve (XII)
• Sensory
• ANTERIOR 2/3rd
– general sensory – lingual branch of mandibular division of trigeminal nerve(1st arch).
– Special sensory – chorda tympanic branch of facial nerve.
– Circumvallate papillae – glossopharyngeal nerve(3rd arch)
• POSTERIOR 1/3rd
– General sensory & special sensory - glossopharyngeal nerve.
• Posterior most portion close to the epiglottis – superior laryngeal branch of
vagus nerve.

11. Ankyloglossia
 Shortening of frenulum linguae
 Produce difficulty in speech
 Corrected by operation -
frenulectomy
Bifid tongue

12. MICROGLOSSIA
MACROGLOSSIA
LINGUAL THYRIOD

13. APPLIED ANATOMY
• Injury to hypoglossal nerve
• Grand mal epilepsy
• Glossitis
• Importance of the tongue
*Red – glossitis
*Red beef tongue –metabolic disorders
*fissured tongue – vitamin deficiency
*Blue tongue – cyanosis
*Yellow -jaundice
*Black hairy tongue –aids
*Coated – fever and other
*pathological condition
 Sublingual absorption of drugs - (aspirin)