Evidence for the connections between a clutch cell and a corticotectal neuron in area 17 of the cat visual cortex.
Evidence is presented for the synaptic connectivity between a physiologically characterized and intracellularly filled GABAergic interneuron and a corticotectal pyramidal neuron in area 17 of the cat visual cortex. The interneuron was located in layer 4 and had the morphological characteristics of a clutch cell. The physiological data demonstrated that the clutch cell received direct X-type innervation from the dorsal lateral geniculate nucleus. These results indicate that a GABAergic neuron is directly involved during the first cortical stages of geniculocorticotectal interactions. Furthermore, the proximal location of the clutch-cell inputs to the labelled dendrite suggests a strategic siting of intracortical feedforward inhibition.
D000818:Animals; D001369:Axons / Q000648:ultrastructure; D002415:Cats; D007395:Interneurons / Q000166:cytology / Q000502:physiology; D008854:Microscopy, Electron; D009474:Neurons / Q000166:cytology / Q000502:physiology* / Q000648:ultrastructure; D011712:Pyramidal Tracts / Q000166:cytology / Q000502:physiology; D013477:Superior Colliculi / Q000166:cytology / Q000502:physiology*; D013569:Synapses / Q000166:cytology / Q000502:physiology; D014793:Visual Cortex / Q000166:cytology / Q000502:physiology* / Q000648:ultrastructure; D005680:gamma-Aminobutyric Acid / Q000502:physiology
D005680:gamma-Aminobutyric Acid