. Elements of the comparative anatomy of vertebrates. Anatomy, Comparative; Vertebrates -- Anatomy. THYMUS GLAND. 227 of the second visceral clefts, which extends inwards from the integument, as well as from the covering of the corresponding visceral swellings. All these parts. Tm FIG. 185.—THYMUS AND THYROID OF A YOUNG STOEK. T, trachea ; B, bronchi; Oe, oesophagus ; H, heart ; Tin, thymus ; Tr, thyroid. are gradually withdrawn inwards and separated from the surface at the boundary between head and 1 His states that in human embryos the gill-clefts never become perforated, but simply b
. Elements of the comparative anatomy of vertebrates. Anatomy, Comparative; Vertebrates -- Anatomy. THYMUS GLAND. 227 of the second visceral clefts, which extends inwards from the integument, as well as from the covering of the corresponding visceral swellings. All these parts. Tm FIG. 185.—THYMUS AND THYROID OF A YOUNG STOEK. T, trachea ; B, bronchi; Oe, oesophagus ; H, heart ; Tin, thymus ; Tr, thyroid. are gradually withdrawn inwards and separated from the surface at the boundary between head and 1 His states that in human embryos the gill-clefts never become perforated, but simply blind slits are formed from both epiblast and hypoblast. The same holds good also for the tyinpano-Eustachian passage. Q 2. 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 Wiedersheim, Robert, 1848-1923; Parker, W. N. (William Newton), d. 1923. London, New York, Macmillan
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