Visuomotor interactions in the mouse forebrain mediated by extrastriate cortico-cortical pathways

Frontiers in Neuroanatomy

Neuroanatomy

Menno P. Witter¹  Jonathan R. Whitlock¹  Ida V. Rautio¹  Andrea M. Hegstad¹  Karoline Hovde² 

[1] Kavli Institute for Systems Neuroscience, Norwegian University of Science and Technology, Trondheim, Norway;Kavli Institute for Systems Neuroscience, Norwegian University of Science and Technology, Trondheim, Norway;Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark;

关键词: mouse;    anterograde tracer injections;    retrograde AAV injections;    immunohistochemistry;    visual cortex;    extrastriate;    motor cortex;   

DOI  :  10.3389/fnana.2023.1188808

 received in 2023-03-17, accepted in 2023-04-14,  发布年份 2023

来源: Frontiers

【 摘 要 】

IntroductionThe mammalian visual system can be broadly divided into two functional processing pathways: a dorsal stream supporting visually and spatially guided actions, and a ventral stream enabling object recognition. In rodents, the majority of visual signaling in the dorsal stream is transmitted to frontal motor cortices via extrastriate visual areas surrounding V1, but exactly where and to what extent V1 feeds into motor-projecting visual regions is not well known.MethodsWe employed a dual labeling strategy in male and female mice in which efferent projections from V1 were labeled anterogradely, and motor-projecting neurons in higher visual areas were labeled with retrogradely traveling adeno-associated virus (rAAV-retro) injected in M2. We characterized the labeling in both flattened and coronal sections of dorsal cortex and made high-resolution 3D reconstructions to count putative synaptic contacts in different extrastriate areas.ResultsThe most pronounced colocalization V1 output and M2 input occurred in extrastriate areas AM, PM, RL and AL. Neurons in both superficial and deep layers in each project to M2, but high resolution volumetric reconstructions indicated that the majority of putative synaptic contacts from V1 onto M2-projecting neurons occurred in layer 2/3.DiscussionThese findings support the existence of a dorsal processing stream in the mouse visual system, where visual signals reach motor cortex largely via feedforward projections in anteriorly and medially located extrastriate areas.

【 授权许可】

Unknown   
Copyright © 2023 Hovde, Rautio, Hegstad, Witter and Whitlock.