From lemurs to apes to humans, primates are distinct between mammals—for instance, our brains are huge in comparison to our dimension. during this quantity, readers are invited into the numerous domain names of those remarkable creatures to find the brilliant range of primate species. Readers also will find out about the lengthy background of people, from our earliest ancestors, the australopiths, to the homo sapiens of at the present time.

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1967b), however, in addition to cells in the medial nucleus found some spinal projecting cells in the descending nucleus. Presumably these cells functionally belong to the medial nucleus and represent cells displaced at some distance from the majority of the medial nucleus cells. If such aberrant cells are few in number, their degenerating axons can not be recognized in anatomical studies. In order to avoid false conclusions concerning correspondence or lack of correspondence between anatomical and physiological observations it is important to be aware of the basis on which borders shown in anatomical diagrams are drawn.

32, 60- I 20. 30 0. L O W E N S T E I N LEDOIJX, A. (1949) Activit6 Blectrique des nerfs des canaux semicirculaires du saccule et de I’utricule chez la grenouille. Acta nto-rhino-laryng. , 3, 335-349. 0. (1936) The equilibrium function of the vertebrate labyrinth. B i d . , 11, 113-145. LOWENSTEIN, LOWENSTEIN, 0. (1950) Labyrinth and equilibrium. Symp. Soc. exp. , 4, 60-82. , OSBORNE, M. P. AND THORNHILL, R. A. ). Proc. roy. Sac. B, 170, 1 13-134. , OSBORNE, M. P. AND WERSALL,J. (1964) Structure and innervation of the sensory LOWENSTBIN, epithelia of the labyrinth in the thornback ray (Raja clavata).

51-53 36 A. B R O D A L Fig. 3. Photomicrographs of horizontally cut Nauta-stained sections in a cat, killed 8 days after a lesion of one fastigial nucleus. Large numbers of degenerating fibres are seen to end in the group x (a) and the group f (b) with much less degeneration in the adjoining regions of the descending vestibular nucleus (to the left in both photos). From Walberg ef at. (1962). of restricted value for determinations of the site and distribution within a nucleus of atrerents from a particular source.

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