title: Synchronous development of motor cortical output to different muscles in the kitten.
abstract: Previous observations indicate that the output linkages from motor cortex (area 4) to triceps brachii motoneurons develop relatively late in the postnatal kitten. Responses in multiple, simultaneously-recorded EMG's from facial, forelimb and proximal hindlimb musculature to intracortical microstimulation appear over gestational days 107-111 (about 41 days postnatally). Thus, output from the motor cortex to alpha motoneurons develops in a synchronous, rather than a sequential manner across the area 4 homunculi.
mesh_terms: D000375:Aging; D000818:Animals; D002415:Cats; D004553:Electric Conductivity; D004558:Electric Stimulation; D009044:Motor Cortex / Q000254:growth & development / Q000502:physiology*; D009132:Muscles / Q000294:innervation*