File:Odgers1938 plate01.jpg

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Plate I


  • 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.

Fig. 1. A section immediately caudal to the interventricular foramen in an 11-2 mm. embryo ( x 80) to show that a tongue-shaped proliferation from the A.-V. cushion, R.I.T., is making contact with the right side of the interventricular septum, I. V.S., ventral to its dorsal border.

Fig. 2. A section through the interventricular foramen in an 11-4 mm. embryo ( x 80). It shows the right bulbar ridge, R.B.R., in contact with the right superior tubercle of the A.—V. cushions, R.S.T., to form the bulbo-auricular channel, B.A.0. R.I.TL marks the inferior A.-V. tubercle proliferating cranialwards.

Figs. 3-5. Sections through this region of the heart in a 12-5 mm. embryo ( x 80). Fig. 3 shows the interventricular septum, I. V.S., capped by cushion tissue (X), which is in contact with the right bulbar ridge, R.B.R. In Fig. 4, which is the next section below Fig. 3, this tissue X is connected with both the right bulbar ridge, R.B.R., and with the A.-V. cushions, A.V.0. Fig. 5 is a section three below the last and shows the proliferating tissue joining the A.-V. cushions, A.V.0. The junction between the two is marked on either side by a notch. The bulbo-auricular channel, B.A.C'., appears in Fig. 3 as a. narrow cleft between the right bulbar ridge, R.B.R., and the A.-V. cushions, A. V.0.: in Fig. 4 this channel is better marked, while in Fig. 5 it is seen to be continuous with the right auricle.

Figs. 6-7. These are sections through the heart of a 14-5 mm. embryo ( x 80). In Fig. 6, which is through the centre of the interventricular foramen, the A.-V. cushion, A. V.0'., is seen to be proliferating, while similar cushion tissue, X, caps the interventricular septum, I. 17.8. In Fig. 7 the proliferating cushion tissue is making contact with that on the septum, X, while its right border is joined by the right bulbar ridge, R.B.R., as it encloses the bulbo-auricular channel, BA .0.

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Pages where the terms "Historic" (textbooks, papers, people, recommendations) appear on this site, and sections within pages where this disclaimer appears, indicate that the content and scientific understanding are specific to the time of publication. This means that while some scientific descriptions are still accurate, the terminology and interpretation of the developmental mechanisms reflect the understanding at the time of original publication and those of the preceding periods, these terms, interpretations and recommendations may not reflect our current scientific understanding.     (More? Embryology History | Historic Embryology Papers)


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 23) Embryology Odgers1938 plate01.jpg. Retrieved from

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