File:Fawcett 1910 fig08.jpg

From Embryology

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Fig.8. Coronal section of a 19 mm Embryo

Coronal section further forward than fig.7, showing (O.W.1) the posterior limb of the orbital wing which bounds posteriorly the optic foramen. The anterior limb is not yet chondrified. Between O.W. and O.W.1 the outgoing optic stalk is evident; H.S. is the hypophysis stalk; above it is a curious middle piece to the corpus sphenoidale, which, though appearing to be independent, is not so, as models prove. the ala temporalis (greater wing); I.5, the 2nd branch of the Trigeminus; E.R.the external rectus. The chief interest in the figure is the independence of the orbital wing (O.W.1).

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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 19) Embryology Fawcett 1910 fig08.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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