. Manual of antenatal pathology and hygiene : the foetus. g q j-g j^Qf ( maxilla. 1 , , ,, veloped; and tlie annulus tympanicus forms a very slight projection. The meatus withthe soft parts in situ is probably of about the same relative length asin the child or adult; it has no anterior or posterior curve upon it;and its inner or tympanic end is somewhat enlarged to form thesinus. The external ear, then, is in a transition state in the fcetus;so is the skull in its neighbourhood. Anterior to the meatus is theantero-lateral fontanelle (region pterion), while posterior to it isthe poster
. Manual of antenatal pathology and hygiene : the foetus. g q j-g j^Qf ( maxilla. 1 , , ,, veloped; and tlie annulus tympanicus forms a very slight projection. The meatus withthe soft parts in situ is probably of about the same relative length asin the child or adult; it has no anterior or posterior curve upon it;and its inner or tympanic end is somewhat enlarged to form thesinus. The external ear, then, is in a transition state in the fcetus;so is the skull in its neighbourhood. Anterior to the meatus is theantero-lateral fontanelle (region pterion), while posterior to it isthe postero-lateral fontanelle (region asterion ), and between these. by the fibroustympanic plate; THE EAR OF THE FGETUS 105 two fontanelles is a medley of small bones and cartilage islands,showing that development is not far advanced in this Adachi (Ztschr. f. Morphol. u. Anthrop., ii. p. 223, 1900) hasgiven an interesting description of the changes which occur in thisneighbourhood in the foetus and new-born infant. Post-natal develop-ment is necessary before the tympanic and squamoso-zygomatic parts
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectfetus, bookyear1902
