File:Fawcett 1910 fig11.jpg

From Embryology

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Fig.11. Coronal section of a 19 mm Embryo

View of the same model from above.

O.W. the orbital wing, with O.W.1, its posterior limb, lying behind the optic nerve and running forwards by the side of the prepituitary segment of the corpus sphenoidale. This is the part marked O.W.1 in the photographs 8 and 9. We see here, too, the middle piece (M.P.), which is thus evident both above and below,butis not an independent formation. P.B. is the pituitary body; Hy. the hypophysis; S.R. is the saddle ridge "Sattellehne" ordorsumn selav and it is important to note, first, that it is a rod of cartilage transversely, pltaed, and, second, that it is quite independent of the rest at this stage; A.T. isthe ala teInporalis seen under cover of G.G., the Gassernia ganglion; C.A. is the carotid artery; A.C. the auditory capsule; whilst P.A. isthe processus alaris.

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  • A. Anterior limb of ala orbitalis forming anterior wall of optic foramen.
  • P. Posterior limb of ala orbitalis forming the posterior and inner walls of the optic foramen.
  • S.E.C. The spheno-ethmoidal cartilage.
  • A.O. Outer end of the spheno-ethmoidal cartilage extending into the temporal fosa.
  • I.O.N. Infraorbital nerve.
  • M.G. Meckel's ganglion.
  • A.T. Ala temporalis.
  • M. Maxilla.
  • N.C. Nasal capsule.
  • C. Connective tissue in which nasal bone ossifies together with part of the nasal process of the maxilla.
  • L.D. Lacrymal duct.
  • L.N.P. Lateral nasal cartilage (MAlihalkowics). Ma. Malarbone
  • P.P. Parietal plate.
  • F. Frontal bone.

Sphenoid Links: Fig. 1. Fig. 2.


Fawcett E. Notes on the development of the human sphenoid. (1910) J Anat. Physiol. 44(3): 207-22. PMID 17232842

Cite this page: Hill, M.A. (2024, June 20) Embryology Fawcett 1910 fig11.jpg. Retrieved from

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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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