24. label the following view of skins accessory structures:

Brief Explanations:

Each label corresponds to a key accessory structure of the skin, identified by their typical anatomical position in a cross-section:

1. Structure ① is the visible part of hair that extends above the skin surface.
2. Structure ② is the coiled gland that produces sweat for thermoregulation, located in the dermis.
3. Structure ③ is the tube that carries sweat from the gland to the skin surface.
4. Structure ④ is the gland that produces oily sebum to lubricate hair and skin, associated with hair follicles.
5. Structure ⑤ is the sheath that surrounds and anchors the hair under the skin.
6. Structure ⑥ is the smooth muscle that contracts to make hair stand up (goosebumps), attached to the hair follicle.
7. Structure ⑦ is the layer of dense connective tissue that forms the lower part of the skin, housing larger blood vessels and glands.

Answer:

1. ①. Hair shaft
2. ②. Eccrine sweat gland
3. ③. Sweat duct
4. ④. Sebaceous gland
5. ⑤. Hair follicle
6. ⑥. Arrector pili muscle
7. ⑦. Dermis (reticular layer)