280 



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 mikr. Anat., Bd. 36, 1890. 



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 dell'Accad. di Med. di Torino, Vol. 7, Anno 64, 1901. 



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 Bd. 10, 1900. 



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 Arch. f. mikr. Anat., Bd. 17, 1880. 



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 Menschen. Anat. Anz., Bd. 7, 1892. 



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Nachdruck verboten. 



On the early Stages in the Ossification of the Pterygoid Plates 

 of the Sphenoid Bone of Man. 



By Edward Eawcett, MB. Edinb., Prof, of Anatomy in Univ. Coll. Bristol. 



With 5 Figures. 



The text books in general state that the internal pterygoid plate 

 is ossified in membrane, independently of the remainder of the sphenoid 

 no notice being taken of the possible difference in manner of ossification 

 of the hamular process; and the date assigned is comparatively late 

 — viz. the fourth month (Cunningham, Quain, Gray, Holden, Heislek), 

 the fifteenth week (Macalister). All the above are agreed that the 

 bone arises in membrane, but Sutton in the 2nd Edition of Morris's 

 Anatomy, p. 90, says: "The internal pterygoid plate arises in a piece 

 of cartilage which represents the palato-quadrate of lower vertebrates." 

 He does not state any definite age at which the bone appears. It is 

 however not of so much importance perhaps to know the exact date of 

 appearance of the centre of ossification for the internal pterygoid 

 plate, as it is to know its comparative date of appearance when con- 

 sidered in relation to the ossification of other parts of the sphenoid. 

 Here are a good many discrepancies, for Cunningham (Thomson) 

 places it sixth in order of sequence, Macalister gives it the fifth 

 place, whilst Quain (Thane) and Morris (Sutton) place it fourth. 



Hertwig states that "the inner pterygoid plates are formed as 

 covering bones. For in the connective tissue of the lateral wall of 



