Hair is not held in by muscles, but there are muscles that an erect a hair called the "arrector pili muscle".
Standing hair is caused by the tiny muscle that connects the hair to the follicle. This muscle is called the arrector pili.
That part is called as hair root. There is very tiny muscle, attached to it.
i assumed you are referring to the arrector pili muscle. usually when you are cold or scared, this muscle contracts, pulling the hair follicle in a upright position. the dents created are called goosebumps. it provides insulation and protects the hair
Tendons hold muscle to bone.
The root of each hair follicle is connected to the small arrector pili muscles are small muscles attached to hair follicles in mammals. Each arrector pili muscle has a bundle of smooth muscle fibers which attach to the follicular units which have nerves.
Piloerector Muscle
NO, the main neck muscle is called the sternocleidomastoid & doesn't get strong enuf for an infant to hold up their head until about 6months of age.
Piloerector Muscle
yes
arrector pili muscle
tiny muscle fibers attached to each hair follicle, which contract to make the hairs stand on end, causing goose bumps.
a human hair can hold 110 grams