The distribution of axon terminals with flattened vesicles in the nuclei of the amygdaloid body of the cat.

The morphology of synapses in the amygdaloid nuclei was studied in 10 cats. On the basis of the percentage of axon terminals with flattened vesicles (F-type) nuclei were distinguished, in which these terminals are as sparsely distributed as in most areas of the central nervous system, from other nuclei in which they are abundant (about one-third to one-half of all synaptic boutons). The lateral, basal dorsal and basal ventral nuclei belong to the first, the medial and central nucleus and the anterior amygdaloid area--to the second group.

Types of synapses in the claustrum of the cat.

Basing on structure of synaptic vesicles, symmetry of presynaptic and postsynaptic densities, and size of synaptic boutons, various types of synapses were found in the claustrum. Most of the synapses connect axon terminals with dendritic spines or small dendrities. They are usually asymmetrical with evident postsynaptic thickening.