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Plate II Fig 10


  • R.B.R. right bulbar ridge.
  • L.B.R. left bulbar ridge.
  • R.S.T. right superior tubercle of the A.-V. cushions.
  • R.I.T. right inferior tubercle of the A.-V. cushions.
  • I.V.S. interventricular septum.
  • A.V.C. auriculoventricular cushions.
  • B.A.C. bulbo-auricular channel.

Figs. 8-10. These are microphotographs of sections from a 155 mm. embryo (x 80). Fig. 8 is immediately cranial to the interventricular foramen and shows that in the proximal bulbar septum the right, R.B.R., and left, L.B.R., bulbar ridges can still be distinguished. The right one is fused with the right superior tubercle of the A.-V. cushions, A. 17.0., while the lefi one joins the interventricular septum, I . V.S. Fig. 9 is a section through the centre of the foramen and shows the septum, I. 17.8., capped with cushion tissue, X. The latter, as is seen in Fig. 10, which is the fourth section caudal to the level of the foraminal closure, joins the A.-V. cushion. A. V.C’, on its left side but is still separated from it on the right by a notch, which appears as a diverticulum from the anterior end of the inferior portion of the bulbo-auricular channel, B.A.C.

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Odgers PN. The development of the pars membranacea septi in the human heart. (1938) J Anat. 72(2): 247-59. PMID 17104688]

Cite this page: Hill, M.A. (2024, June 13) Embryology Odgers1938 fig10.jpg. Retrieved from

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