. A laboratory manual and text-book of embryology. Embryology. i6o THE DISSECTION OF PIG EMBRYOS FOR STUDY the union of the second branchial arches forms the copula. This, with the por- tions of the second arches lateral to it, forms later the base or root of the tongue. Between it and the tuberculum impar is the point of evagination of the median thyreoid gland. The copula also connects the tuberculum impar with a rounded prominence which is developed in the mid-ventral line from the bases of the third and fourth branchial arches. This is the anlage of the epiglottis. In later stages (Fig. 15
. A laboratory manual and text-book of embryology. Embryology. i6o THE DISSECTION OF PIG EMBRYOS FOR STUDY the union of the second branchial arches forms the copula. This, with the por- tions of the second arches lateral to it, forms later the base or root of the tongue. Between it and the tuberculum impar is the point of evagination of the median thyreoid gland. The copula also connects the tuberculum impar with a rounded prominence which is developed in the mid-ventral line from the bases of the third and fourth branchial arches. This is the anlage of the epiglottis. In later stages (Fig. 151 A and B) the lateral mandibular anlages increase rapidly in size, are bounded laterally by the linguo-alveolar grooves, and fuse with the tuberculum impar which lags behind in development and is said to form the median septum of the tongue. According to Hammar, it completely atrophies. The epiglottis becomes larger and concave on its ventral surface. Caudal to it, and in early Lateral tongue Thyreoid swellings diverticulum Lateral tongue swellings. ntrance to larynx. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Prentiss, Charles William, 1874-1915. Philadelphia, London, W. B. Saunders
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