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Section through the spine of a Rhesus monkey

Legend:
1 dorsal root
2 ventral root
3 central canal
4 neurites
5 connective tissue
English name: Rhesus monkey
Scientific name: Macaca mulatta
Familia: Cercopithecidae
Classis: Mammalia
Phylum: Chordata (subphylum vertebrata)
Regnum: Animalia
ad 1 + 2. Dorsal and ventral root form together the gray matter. Ad 3. The central canal is filled with cerebrospinal fluid.