The blood vessels aren't considered to be part of the accessory structures of the integumentary system.
- The integumentary system simply refers to the largest organ that can be found in the body of human beings. They help in the protection of the body against external harm as they form a physical barrier.
- The integumentary system are the organs which are helpful in forming the outer layer of the body of human beings. Some of the accessory structures include nails, hairs, sebaceous glands, sweat glands etc. It should be noted that blood vessels aren't considered to be part of the accessory structures.
In conclusion, the correct option is B.
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