Figure S 1. S1. Histological evaluation of lateral hemisection.
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1 Dorsal Central Ventral Figure S1. Histological evaluation of lateral hemisection. Schematic Figure S1. Histological evaluation of lateral hemisection. Schematic representation of hemisection at. Dashed lines indicate horizontal planes of tissue sections evaluated. Images show representative examples of histological evaluation of cresyl violet stained horizontal sections of spinal cords with scarring that encompasses over 50% of the side-to-side dimensions of the spinal cord through its entire dorsal and ventral extent, in a manner compatible with complete lateral hemisection. Arrowheads indicate midline.
2 a 100 Ipsi Contra b 100 Stance duration (% of cyc cle duration) PRE POST (days) Dra agging (% of cyc cle duration) 50 0 PRE POST (days) 3 Figure S2. Recovery of supraspinal control of stepping after a lateral hemisection at. (a) Bar graphs of average (n = 8 mice, 10 steps per animal) normalized stance duration pre and 7-48 days post left hemisection, and 3 days after a delayed (ten weeks) right hemisection. (b) Bar graphs of paw dragging expressed as percent of cycle duration (n = 8 mice). Error bars, S.E.M., : statistically significant difference between preand post-lesion values, and between ipsilateral and contralateral hindlimbs, respectively.
3 a c SCI : Chronic SCI : Chronic No injury b SCI : Acute SCI : Chronic d e + SCI : Acute + SCI : Chronic SCI TIME SCI 2 TIME f T8-10 g SCI : Chronic + SCI h SCI : Chronic + T8-10 SCI : Chronic i + SCI : Chronic + T8-T10 Supraspinal Propriospinal Lumbar motor circuits Figure S3. Schematic drawings summarizing the effects of the different combinations of lateral hemisections and lesions on the direct and indirect supraspinal control of stepping. (a) Control of stepping by direct supraspinal connections to lumbar motor centers in uninjured mice. (b) Acute loss of stepping ipsilateral to a lateral hemisection that interrupts supraspinal connections on that side. (c) Chronic recovery of stepping after lateral lateral hemisection in spite of loss of supraspinal connections. (d) Acute loss of ipsilateral stepping and partial loss of recovered contralateral stepping after a delayed lateral hemisection at. (e) Chronic recovery of bilateral stepping after and delayed lateral hemisections mediated by indirect propriospinal p p relay connections in spite of the loss of direct supraspinal p connections to the lumbar motor centers. (f) Preserved supraspinal control of stepping after mediated ablation of intrinsic spinal cord neurons at T8-T10 in otherwise uninjured mice. (g) Loss of recovered stepping after delayed contralateral lateral hemisection at. (h) Loss of recovered stepping on the side of the lateral hemisection but not on the uninjured side after ablation of intrinsic spinal cord neurons at T8-T10 (i) Loss of recovered stepping on both sides after and delayed lateral hemisection after ablation of intrinsic spinal cord neurons at T8-T10. T10
4 a b c Simultaneous Delayed hemisection Delayed complete transection Left () Right () Left () Right () Left () Right () Time after lesio on (days) 28 3 Figure S4. Recovery of supraspinal control of stepping after delayed but not simultaneous left- and right- hemisections or after delayed complete transection at. (a-c) Stick diagrams of left and right hindlimb movements during swing (or dragging) at 3 and 28 days after either simultaneous left- and right- hemisections (a), delayed right- hemisection 10 weeks after left- hemisection (b), or delayed complete- transection 10 weeks after left- hemisection (c).
5 a Uninjured + T8-T10 infusion Right Left () b Left (- ) hemisection + T8-T10 infusion Right c + delayed hemisections + T8-T10 infusion Left (- ) Right ( ) Figure S5. Excitotoxic ablation of T8- T10 neurons abolishes the recovered control of stepping after a hemisection and after a hemisection followed by a delayed hemisection. (a-c) Stick diagrams show left and right hindlimb movements during the swing phase at 2-5 days after injection in uninjured mice (a), and in mice that had recovered from a left hemisection (b) or from left and delayed right hemisections (c).
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