File:HansonAnsonBast1959 fig02.jpg

Fig. 2. As is clearly demonstrated in sections, the common blastemallobe is situated dOl'sal to the pharyngeal groove, whfl'l' it is indented by the faf"ialuerve 01/ ils dorsolateral aspect. It is through the prl'sellce oj Ihe II1'ollllred by lhe nel'l1f' that the following fOl·eca.sl IIUlY be marle: the medial (mel larger Pllrt the lobe lI'I'lI gil'e rise 10 the stapes; the pm'llale"al to Ihe nerve wiLL become the latero- h!Jllle; Ihe iniercollllectillg portioll, lchirh i.s slit! very iJroad, will become Ihe interh!Jale. The narrou'ing of Ihe illta h!Jllle and subseqllenl sepamlion of lhe sta pet/ial ]Jorlion (rom the 10lerohyale is seemingly il/.f/Ilel/cet! by Ihe IJreSSllre Ihe j'arial !lCI" 'e, as Ihis lIIas.' il/f'/wlses III a 1II0re 1O]Jid rate than does the //('I'1'e

The jJ1'l'sellce of the .,10peilial arlery ideNtifies part oj' the (!pneral a the "slapes": it is still solid, 1101hCII,illg yel ([cqlli,.ed Ihe form of (In annllle/. The filllire po.silion of the artery i,l the cellier of the II/(/S' fLpp('l/rS 10 be dill' 10 a foldillg aroulld Ihe arlcr!J as the bla'iema enlarges.

IIi,.mlflh elm'flalion of Ihe ",it lhis 810(/1' Ihe blaslema IlIfLlj Iw said, far the firsl limp, 10 jJo8seM a dis/illfl1lishable boundar!J. InIhe(Ph-IIIIII..,Iagelhptissueintheror,.pspolldingbra"cll1:alareaisrt simple,di,fluMmesench!Jme.

Reference

Hanson JR. Anson BJ. and Bast TH. The early embryology of the auditory ossicles in man. (1959) Q Bull Northwest Univ Med Sch. 33: 358-379. PMID: 14399619

Cite this page: Hill, M.A. (2024, April 27) Embryology HansonAnsonBast1959 fig02.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:HansonAnsonBast1959_fig02.jpg

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