File:Fawcett 1910 fig14.jpg

From Embryology

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Fig.14, Coronal section of the head of an 80mm embryo

Here the cartilage of the great wing is shown with very characteristic form at this plane of section, appearing somewhat like a half-bent forefinger (A.T.), the concavity being the anterior end of the foramen rotundum; the superior maxillary division of the 5th nerve (I.5) is seen in this concavity running outwards from Meckel's ganglion (M.G.). The cartilage is in a somewhat advanced condition of osification, but its relative size is no greater than in the 30 mm embryo, and its form is quite identical with that in the above-mentioned embryo. Projecting downwards from the lower end of the cartilage, membrane bone of deep black colour is seen forming.the ectochondral external pterygoid plate (E.P.), whilst in the upward direction membrane bone is evident, and it will form, as previously stated, the orbital plate and that part of the great wing which is found in the temporal fossa.

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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 13) Embryology Fawcett 1910 fig14.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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