Zootomy

Zootomy

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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. 1900 edition. Excerpt: ...53. The hollows on the inner surface of the brain-case for the lodgment of various parts of the brain: the basis cranii is deeply concave from before backwards for the reception of the medulla oblongata (Fig. 58, m.o): in the frontal region, or dorsal portion of the brain cavity, is the large cerebral fossa for the reception of the cerebral hemisphere (Fig. 58, c.K); below this and separated from it by a well marked horizontal ridge of bone is the rounded optic fossa for the optic lobe (Fig. 58, o.l); behind and below these two hollows is the cerebellar fossa for the cerebellum (Fig. 58, cb), limited in front by a ridge--the tentorial ridge--which passes obliquely upwards and backwards from the basis cranii to meet its fellow of the opposite side in the roof of the skull somewhat anterior to the lambdoidal ridge. 54. The auditory capsule, a considerable thickening of the brain-case just external to the foramen magnum, and encroaching upon the optic and cerebellar fossae: it is limited above by a well marked semicircular ridge, which indicates the position of the anterior semicircular canal, a swelling at its anterior end marking the position of the ampulla of that canal (see figure of cod's auditory organ, p. 123): within the arch of this canal is another ridge, indicating the inner (anterior) portion of the posterior semicircular canal. The position and relation$ of the three semicircular canals are best seen by cutting away with a penknife the outer table of the cranial bones in the auditory region, and then carefully removing the diploe; the canals are surrounded by a dense layer of bone, which, isolated in the way described, forms the bony semicircular canals, precisely corresponding in form and position with the contained membranous...show more

Product details

  • Paperback | 100 pages
  • 189 x 246 x 5mm | 195g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 123686767X
  • 9781236867674