Blood vessels nourish the cells in the hair bulb and deliver hormones that modify hair growth and structure at different times of life. The bulb is home to several types of stem cells that divide every 23 to 72 hours faster than any other cells in the body.
Hair Follicle Wikipedia
It resides in the dermal layer of the skin and is made up of 20 different cell types each with distinct functions.
Hair bulb structure. It also contains hormones that affect hair growth and structure during different stages of life like puberty. The structure of the hair bulb in this image you will find medulla cortex hair cuticle inner root sheath cuticle of inner root sheath huxleys layer henles layer outer root sheath connective tissue layer in it. The three inner layers become the hair.
When they reach the upper part of the bulb they arrange themselves into six cylindrical layers. In the hair bulb living cells divide and grow to build the hair shaft. A hair without a bulb then means that the hair was lost prior to the root.
The portion of a hair above the skin is called the shaft and all that beneath the surface is the root. The germinal matrix grows the inner root sheath this is the white bit at the end of a hair if its pulled out. A hair follicle anchors each hair into the skin.
It may be small or large white or pigmented. All hair lost at the root will contain a bulb. Explanation of hair and hair follicle structure and functions for hair follicle anatomy see more here.
Structure of hair follicle. The root penetrates deeply into the dermis or hypodermis and ends with a dilation called the hair bulb. The hair bulb forms the base of the hair follicle.
Cells continually divide in the lower part of the bulb and push upwards gradually hardening. Hairs main function in humans is to sense insects on the skin before they bite or sting us. The only living cells of a hair are in and near the hair bulb.
Its fed by capillaries. The hair bulb is a structure of actively growing cells which eventually produce hair. Picture of the hair.
The hair follicle regulates hair growth via a complex interaction between hormones neuropeptides and immune cells. The hair follicle is a dynamic organ found in mammalian skin. The bulb is the stocking like structure that surrounds the papilla and germinal matrix.
This is caused by premature breakage typically a result of tension or physical stress. However the bulb is always present when it comes from the source that is the follicle. Hair shaft cells are similar at first.
The germinal matrix also contains stem cells these grow the hair shaft through constant cell division which continuously push older cells upwards.
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