Human Hair. It has two distinct layers; the fibrous layer (outermost) and the cambium layer, which is the innermost layer. The fibrous layer of the pericranium contains fibroblasts. Meanwhile, the cambium layer contains progenitor cells which later develop and form osteoblasts.

The skin consists of three layers of tissue: the epidermis, an outermost layer that contains the primary protective structure, the stratum corneum; the dermis, a fibrous layer that supports and strengthens the epidermis; and the subcutis, a subcutaneous layer of fat beneath the dermis that supplies nutrients to the 

Sweat glands are tubular structures located within the deeper dermal tissue that contain a rich network of capillaries and nerve fibers.

Reference:
Mitchell, B., & Sharma, R. (2009). The integumentary, skeletal, and muscular systems. Science Direct. Retrieved from https://www.sciencedirect.com/topics/neuroscience/integumentary-system#:~:text=The%20integumentary%20system%20is%20an,sensation%2C%20pressure%2C%20and%20temperature.

Ebling, F. J. G. (n.d.). human skin. Britannica. Retrieved from https://www.britannica.com/science/human-skin

Baxter, A. (2022, March 16). Scalp and hair histology. KenHub. Retrieved from https://www.kenhub.com/en/library/anatomy/histology-of-the-scalp-and-the-hair

Gibbons, C. H. & Freeman, R. (2012). Cutaneous Autonomic Innervation. Science Direct. Retrieved from https://www.sciencedirect.com/topics/medicine-and-dentistry/sweat-gland