1. Abd-el-Malek S (1939) Observations on the morphology of the human tongue. J Anat 73:201–210
2. Barnwell YM, Klueber K, Langdon HL (1978) The anatomy of the intrinsic musculature of the tongue in the early human fetus: part 1, M. longitudinalis superior. Int J Oral Myol 4(3):5–8
3. Barnwell YM, Langdon HL, Klueber K (1978) The anatomy of the intrinsic musculature of the tongue in the early human fetus: part II, M. longitudinalis inferior. Int J Oral Myol 4(4):5–8
4. Bergman RA, Thompson SA, Afifi AK, Saadeh FA (1988) Compendium of human anatomic variation: text, atlas, and world literature. Urban & Schwarzenberg, Baltimore, Munich, p 35
5. Blount RF, Lachman E (1953) The digestive system. In: Schaeffer JP (ed) Morris’ human anatomy, 11th edn. The Blakiston Company, New York, Toronto, pp 1292–1424