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Fig. 7. Conceptual model of the roll postural system. (A) Right and left groups of
reticulospinal (RS) neurons, RS(R) and RS(L), receive inputs from the
labyrinths (La); they affect the spinal networks to evoke oblique body
flexions (double-headed arrows) that lead to rolling of the lamprey. (B)
Operation of the system. The curves represent the activity in RS(R) (thick
line) and RS(L) (thin line) as a function of roll angle. Vestibular input
causes activation of RS(R) and RS(L) with the contralateral tilt. Directions
of rolling caused by RS(R) and RS(L) are indicated by the black and white
arrows, respectively. The system has an equilibrium point at 0°
(dorsal-side-up orientation). (C) Sequence of events during restoration of
normal orientation by the lamprey, following an imposed 90° tilt to the
left (see text for details). Thick arrows in iii and iv indicate the direction
of the roll turn. R, right; L, left; D, dorsal; V, ventral sides of the
body.
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