The Observation Of Distinct Locomotor Behaviour Essay

1617 Words Mar 20th, 2016 null Page
The observation of distinct locomotor behaviour presented by the different zebrafish embryos is consistent with the findings of previous studies. From 17 hpf, zebrafish embryos demonstrate spontaneous tail coiling by contracting the sides of its tail, a form of specialised locomotor behaviour activity (Brustein et al., 2003). Spontaneous tail coiling is not myogenic but arises from the innervation of functional motorneurons, which are situated in the spinal cord, and the frequency of the activity is most enhanced in 19 hpf embryos (Saint-Amant and Drapeau, 1998). Supraspinal input is not depended upon and neurotransmitters such as glutamate and glycine do not regulate this form of locomotor behaviour (Saint-Amant and Drapeau, 2001 cited in Downes and Granato, 2005).

Stimulating a zebrafish at 19 hpf does not have any effect on locomotor behaviour, which differs to those at 26 hpf (Brustein et al., 2003). As mentioned in the results section, locomotor behaviour of 26 hpf zebrafish embryos do not demonstrate spontaneous tail coiling. Locomotor activity of these embryos only occur when a stimulus is applied by touching the surface of the tail, which leads to the generation of fast coils (Saint-Amant and Drapeau, 1998). Although during the experiment the hindbrain was not stimulated, Saint-Amant and Drapeau (1998) found that by touching the hindbrain full coils occur, which differs to the partially generated coils when the stimulation is applied to the tail. The partial coils…

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