presynapticadj.

1903 Bull. Torrey Bot. Club 30 522 The pairing of the chromosomes and the form of telophase following are, in the pea, peculiar to the presynaptic nuclear division.

1921 Ann. Bot. 35 367 Fig. 5 represents a presynaptic pollen mother-cell.

1998 Genetics 150 1199 The analysis of the pattern of isochromosome pairing allows one to distinguish factors affecting presynaptic alignment of homologous chromosomes from those affecting synapsis and crossing-over.

1935 Jrnl. Cellular & Compar. Physiol. 7 95 (title) Action potentials in the nervous system of the crayfish. V. Temporal relations in presynaptic and postsynaptic responses.

1965 G. H. Bell et al. Textbk. Physiol. & Biochem. (ed. 6) xxxix. 796 In general the presynaptic fibre divides up into numerous fine branches which then end in greatly expanded terminals, presynaptic knobs.

1979 Internat. Rehabilit. Med. 1 45/1 New evidence of the blocking of pain specific receptors..by morphine-like substances produced by presynaptic dendrites.

2003 Sci. Amer. Feb. 36/3 Prozac and similar antidepressant drugs work by binding to serotonin transporters and preventing presynaptic neurons from soaking up the secreted serotonin too quickly.

1962 Proc. Royal Soc. B. 155 468 The frequency of the miniature potentials is controlled presynaptically—and only presynaptically—by the membrane potential of the nerve endings.

1984 J. F. Lamb et al. Essent. Physiol. (ed. 2) ii. 38 This delay is due to the release presynaptically of a chemical, acetylcholine (ACh).

2000 B. A. Root Understanding Panic & Other Anxiety Disorders v. 48 These medicines are potent reuptake inhibitors in serotonergic systems presynaptically.