File:Odgers1939-plate02.jpg

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Plate II

6. A section through the right lateral cusp in a 46 mm. embryo ( x 60). Here the cusp consists entirely of ventricular muscle, V., with the remains of the right cushion, R.C'. The junction of auricular muscle, A., with that of the ventricle, V., is now dorsal to the line of attachment of the cusp and the angulation of the sulcus, A.V.S., is much less marked.

7. A section through the right lateral cusp in a 61 mm. embryo ( x 60). The angulation of the sulcus, A.V.S., has now disappeared and, as before, auricular muscle, .11., joins that of the ventricle, V., dorsal to the base of the cusp.

8. A section through the right lateral cusp in an 85 mm. foetus ( x 60). The cusp is now collagenous and is continuous with the A.-V. sulcus, A.V.S., this continuity separating auricrular muscle, A., from that of the ventricle, V. Ventricular muscle just comes over on to the base of the cusp. R.C'. marks the apparent remains of cushion tissue.

9. A section through the right lateral cusp in a 210 mm. foetus ( x 60) to show that auricular muscle, A., does extend on to the base of the cusp in some sections at this stage, the rest of which is entirely collagenous.

10. A section through the right lateral cusp of a full time foetus ( x 60). Note the well-marked annulus fibrosus AR, and that both ventricular muscle, V., and auricular muscle, A., stray on to the base of the cusp to a very small extent.

Historic Embryology Papers

Reference

Odgers PNB. The development of the atrio-ventricular valves in man. (1939) J Anat. 73: 643-57. PMID 17104787



Cite this page: Hill, M.A. (2024, June 13) Embryology Odgers1939-plate02.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Odgers1939-plate02.jpg

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© Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G

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