Philosophical Transactions of the Royal Society of London Volume 172, PT. 1

Philosophical Transactions of the Royal Society of London Volume 172, PT. 1

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1881 edition. Excerpt: ...wide tegmen tympani (t.ty.), which overhangs the vestibule (fig. 7) to an unusual extent. These right and left bony regions reach to the fore edge of the foramina ovalia, below, which they almost encircle. The skull is wide behind, .and narrows evenly, with scarcely any bulging up to the axils of the ethmoidal region. The covered fontanelle (fig. 6) is very large; it reaches to within a short distance of the foramen magnum, behind, and leaves very little tegmen cranii in front. The edges formed by the walls of the skull are straight, and those walls have scarcely any " coping." The converging and slightly bulging interorbital walls are unossified from the foramina ovalia to the ethmoidal axils; in the hinder third of these cartilaginous tracts, the optic fenestra (II.) is seen to be of moderate size. The girdle-bone (eth.) scarcely covers its own territory in front, and behind, only ossifies the axillary or pinched part, reaching some way back below; above (fig. 6) it is imperfect, its halves scarcely meeting at the mid-line. The nasal region is entirely unossified, there is no prenasal rostrum, and the prorhinals (fig. 7, pmh.) are well developed; the suhnasal lamina (s.n.l.) is very broad, and the roof (fig. 6) is of normal width. The external nostrils (e.n.) are only half as wide apart as the internal The palato-suspensorial arch is quite normal, both in its cartilage and in its bones (pa, pg.); but both the pedicle (pol) and the quadrate (q.c.) are short; the latter is scarcely affected by the quadrato-jugal (qj.). The Eustachian openings (fig. 7) are rather small, and directed obliquely outwards and forwards. The annulus (fig. 8, a.ty.) is a very small crescent, one-third the average diameter. The stapes (fig. 10, st.) is...
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Product details

  • Paperback | 136 pages
  • 189 x 246 x 7mm | 254g
  • United States
  • English
  • black & white illustrations
  • 123698935X
  • 9781236989352