. The American journal of anatomy. ally has been inferred from astudy of the sections, but in a few instances wax models weremade of regions requiring a fuller interpretation. This embryo (extra-uterine) measured in formalin mm.,greatest length, with a neck breech of nmi. The greatestlength in 80 per cent alcohol was mm. In previous papersin which this embryo was referred to (Thyng 08, and Lewis andThyng 08), the latter measurement was given. EXTERNAL FEATURES The external features of this embryo are seen in profile viewin text figure 1, a reproduction of figure 104 in Minots (1
. The American journal of anatomy. ally has been inferred from astudy of the sections, but in a few instances wax models weremade of regions requiring a fuller interpretation. This embryo (extra-uterine) measured in formalin mm.,greatest length, with a neck breech of nmi. The greatestlength in 80 per cent alcohol was mm. In previous papersin which this embryo was referred to (Thyng 08, and Lewis andThyng 08), the latter measurement was given. EXTERNAL FEATURES The external features of this embryo are seen in profile viewin text figure 1, a reproduction of figure 104 in Minots (10)Laboratory text-book of embryology, also in part in plates 3and 5. The neck-bend is approximately a right angle; thecephalic flexure is also very nearly a right angled bend, so thatthe oral aperture is in close proximity to the cardiac region. Thedorsal flexure has disappeared almost entirely, only a slightelevation persisting to mark its earlier position. Above this THE AMERICAN JOURNAL OF ANATOMY, VOL. 17, NO. 1 34 F. W. THYNG. Text fig. 1 Human embryo of mm. (H. E. C. 839).Minot).2 X 5 diams. (after elevation there is a shallow depression, said to disappear in thecourse of development. A distinct groove, extending transversely l)etween the medialangles of the developing eyes, separates the forehead from theroot of the nose. The maxillary process of either side has joinedthe adjacent lateral and median nasal processes, obliterating thenaso-optic grooves. The nares are open, but separated by arather low, broad sei)tum. A triangular space still intervenesbetween the globular processes so that the median region of theupper lip is not well differentiated. The median groove betweenthe ventral ends of the mandibular arches has been obliterated,but differentiation between the chin and lip regions has not A reproduction of figure 104, ])age 153 of Laboratory Textbook of Embry-ology, Charles Sedgwick Minot, edition of 1910, published by P. BlakistonsSon and Company, Pliiladclpl
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