The anatomist's vade mecum : a system of human anatomy . the convolutions of the anterior lobes of the * The external surface of the frontal bone. 1. The situation of the frontaleminence of the right side. 2. The superciliary ridge. 3. The supra-orbitalridge. 4. The external angular process. 5. The internal angular The supra-orbital notch for the tiansmission of the supra-orbital nerveand artery; in the figure it is almost converted into a foramen by a smallspiculum of bone. 7. The nasal tuberosity ; the swelling around this pointdenotes the situation of the frontal sinuses. 8. The
The anatomist's vade mecum : a system of human anatomy . the convolutions of the anterior lobes of the * The external surface of the frontal bone. 1. The situation of the frontaleminence of the right side. 2. The superciliary ridge. 3. The supra-orbitalridge. 4. The external angular process. 5. The internal angular The supra-orbital notch for the tiansmission of the supra-orbital nerveand artery; in the figure it is almost converted into a foramen by a smallspiculum of bone. 7. The nasal tuberosity ; the swelling around this pointdenotes the situation of the frontal sinuses. 8. The temporal ridge, com-mencing from the external angular process (4). The depression in whichthe figure 8 is situated is a part of the temporal fossa. 9. The nasal spine. 28 FRONTAL BONE. cerebrum. The superior border is thick and strongly serrated,])evelled at the expense of the internal table in the middle, where itrests ujDon the junction of the two parietal, and at the expense of theexternal table on each side where it receives the lateral pressme of. those bones. The inferior border is thin, irregular, and squamous, andarticulates with the sphenoid bone. Development.—By tioo centres, one for each lateral half. Ossifica-tion begins in the orbital arches, somewhat before the vertebrae. Thetwo pieces are separate at birth, and unite by suture dm-ing the firstyear, the suture sometimes remaining permanent through life. Thefrontal sinuses make their appearance during the first year, andincrease in size until old age. * The internal surface of the frontal bone; the bone is raised in such amanner as to show the orbito-nasal portion. 1. The grooved ridge for thelod^rment of the superior longitudinal sinus and attachment of the falx.•2. The foramen csecum. 3. The superior or coronal border of the bone ; thefigure is situated near that part which is bevelled at the expense of theinternal table. 4. The inferior border of the bone. 5. The orbital plate ofthe left side. 6. The cellula
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Keywords: ., boo, bookcentury1800, booksubjectanatomy, booksubjecthumananatomy
