528 



Die trenuende Gewalt scheinen Gefäßbildungen zu sein. Es sieht 

 in meinem Falle der Leberaberration ganz so aus, als habe das Gefäß 

 auch noch die beiden kleinen Läppchen auseinandergesprengt. 



Für die Bestimmung des teratogenetischen Terminationspunktes 

 (Schwalbe) ist schon oben in dem Zitat von Lossen das Nötige 

 enthalten. 



Nachdruck verbotai. 



A Contribution to the Deyelopment of the inter-i)halangeal 



Sesamoid Bone. 



By 0. Charnock Bradley, M.B., D.Sc, B-oyal Veterinary College, 



Edinburgh. 



With 5 Figures. 



From time to time, various anatomists have directed their attention 

 to those small bones of the mammalian limb which are generally grouped 

 together under the term "sesamoid". Among the first to give them 

 detailed examination and systematic description was Gillette i), who, 

 in 1872, published an account of them as they occur in Man, and ar- 

 rived at certain noteworthy conclusions. Sesamoids, he said, should be 

 divided into two classes: periarticular and intra-tendinous. Periarticular 

 sesamoids are not produced accidentally in fibrous tissue; but are true 

 bones developed in pre-existing cartilage. Though there are not, pro- 

 perly speaking, sesamoid bones in the human foetus, or in the child 

 under two years of age, their position is always indicated. They are 

 developed, Gillette goes on to say, on the flexor side of the articu- 

 lation, and play a part in protection, solidity and mobility. 



Among others attracted by the sesamoids of the human extremities, 

 may be mentioned Aeby ^), Pfitzner ^) and Thilenius '^). The last 

 mentioned published the results of his investigations in 1895, and threw 

 much light upon the significance of the sesamoid bones as they ai*e 

 found in the hand of the human subject. He traced their developmental 

 history very fully, but mainly confined his consideration to those ses- 

 amoids which are found in association with the metacarpo-phalangeal 



1) Gillette, Des os sesamoides chez I'homme. Journ. de I'Anat. 

 et de la Phys., T. 8, 1872. 



2) Aeby, Die Sesambeine der menschlichen Hand. Arch. f. Anat., 

 Phys. u. wiss. Med., 1875. 



3) Pfitzner, Beiträge zur Kenntnis des menschlichen Extremitäten- 

 skeletts. Zweite Abt. IV. Die Sesambeine des menschlichen Körpers. 

 Morph. Arbeiten, Bd. 1, 1892. 



4) TiiiLENius, Zur Entwickelungsgeschichte der Sesambeine der 

 menschlichen Hand. Morph. Arbeiten, Bd. 5, 1895. 



