File:Fawcett 1910 fig15.jpg

From Embryology

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Fig. 15.Photograph of a horizontal section of the head of a 110 mm embryo

Shows two points of great interest, viz. ossification in the corpus sphenoidale - the post-sphenoidal centre (P.S.C.), which has a somewhat curious form,and giving rise to a litle doubt as to whether it is a single centre or the result of fusion of two originally independent ones; 1 and ossification in the processus alaris (P.A.). This is obviously independent of that in the corpus sphenoidale,and its large size is somewhat surprising, if it form only that part commonly in our text-books called lingula. From its posterior end a pointed cartilaginous process is seen to pass backwards towards the auditory capsule (A.C.), and between the processus alaris and the auditory capsule the internal carotid artery (C.A.) is seen in transverse section.

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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 fig15.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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