The functional organization of efferent pathways connecting the superior colliculus (SC) with neck motoneurones and with motoneurones of extraocular muscles has been extensively studied by intracellular techniques in acute preparations. This approach has revealed basic circuits underlying contraversive conjugate eye movements. Transmission to neck motoneurones has been analysed independently of that in the tecto-oculomotor pathways, except for one study, in which reticular neurones presumably controlling the eye–neck synergy were discovered using intracellular recording and staining. Briefly, the main conclusion of intracellular work was that an efficient excitatory transmission from the SC to motor nuclei requires the participation of reticular neurones, even though there exist monosynaptic collicular connections to abducens and to neck motoneurones.
Grantyn, A., Berthoz, A., Olivier, E., & Chat, M. (1993). Control of gaze by tectal and reticular projection neurones. In Alain Berthoz (ed.), Multisensory Control of Movement (p. p. 185-200). Oxford University Press. https://doi.org/10.1093/acprof:oso/9780198547853.003.0109