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Figure 6


Fig. 6. Schematic representation of the adaptive and sensorimotor pathway as derived from our fMRI studies (this study) (Van den Burg et al., 2005), and from several neuroanatomical studies. The acclimation pathway is probably triggered by a reduction of the temperature of the cerebral blood, and starts with thermodetection in the preoptic area (poa), where also a subsequent stress response is initiated. This leads to activation of the pituitary pars distalis (pd; to stimulate the release of ACTH). The sensorimotor pathway is probably triggered by trigeminal cold-receptors in the buccal cavity, and involves sequential activation of the sensory root of the trigeminal nerve (N), the associated sensory nucleus (NVs) and the valvula cerebelli (vc). The vc probably stimulates one or more motor nuclei (the nucleus of the medial longitudinal fascicle (nmlf), the nucleus ruber (nr) and the reticular formation (srf and imrf) to initiate (broken lines) swimming behavior.





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