Regional anatomy in its relation to medicine and surgery . enth cervical vertebra {the vertebra prominena), 16. The first rib. 17. The spine of the second dorsal vertebra. 18. The frontal eminence. 19. The anterior inferior angle of the parietal bono. 20. The supra-orbital foramen. 21. The superciliary ridge {the ophryon). 22. The glabella. 23. The external angular process. 24. The junction of the frontal and nasal bones {the nasion). 25. The zygomatic arch. 26. The infra-orbital foramen. 27. The second upper molar tooth. 28. The angle of the lower jaw {the gonion), 29. The mental foramen. 30.
Regional anatomy in its relation to medicine and surgery . enth cervical vertebra {the vertebra prominena), 16. The first rib. 17. The spine of the second dorsal vertebra. 18. The frontal eminence. 19. The anterior inferior angle of the parietal bono. 20. The supra-orbital foramen. 21. The superciliary ridge {the ophryon). 22. The glabella. 23. The external angular process. 24. The junction of the frontal and nasal bones {the nasion). 25. The zygomatic arch. 26. The infra-orbital foramen. 27. The second upper molar tooth. 28. The angle of the lower jaw {the gonion), 29. The mental foramen. 30. The top of the hyold bone. 81. The top of the thyroid cartilage. 82. The cricoid cartilage. 83. The second ring of the trachea. 84. The acromial end of the clavicle. 85. The acromion process of the The top of the sternum {the manubrium),37. The coracoid process (if the scapula. 88. The glenoid fossa of the scapula. N. B.—This plate was taken from the skeleton of a well-developed European male, aged about thirty-seven years. Plate I Vol I. -rcted, ^c at-d Colqrec from?iaiure r>y (7/ro9a£ Mc. , M0_ Copyn^^ht, 1831. by GroRGE Mc M D. A,,ion5(>:o liih Sjsi THE REGION OF THE HEAD. 6 sutures they may be mistaken for fractures. In this locality also arefrequently found isolated triangular bony pieces {Wormian bones),originating from accessory centres of ossification (Plate 3, Fig. 3, and 13). Supernumerary bones are also often found in hydrocephalicskulls. The superciliary ridges are the prominences which support the eye-brows. They indicate in a measure the size of the frontal sinuseswithin the bone, which are first formed by absorption of the spongysubstance (diploe) at the inner angular processes of the orbits, andgradually spread upward and outward. The dimensions of the frontal sinuses (Plate 12, No. 25) cannotalways be foretold by the external conformation of the ridges; and theyoften appear to be formed by a retro
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