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Pa Pe Ph Pi Po Pr Ps Pu
Pil Pin Pit

Pilosebaceous unit

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The pilosebaceous unit is a complex structure consisting of the hair follicle and its associated structures. The hair follicle is responsible for producing and maintaining hair growth, while the sebaceous gland produces sebum, an oily substance that moisturizes and...

Pineal gland

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The pineal gland is a small, pea-shaped gland in the brain that produces melatonin, a hormone that helps to regulate sleep and wakefulness. The pineal gland is located in the epithalamus, which is the part of the brain that is located above the thalamus. The pineal...

Pituitary gland

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The pituitary gland is a small gland located in the center of the head, just below the hypothalamus, and is considered the most complex organ of the endocrine system. It produces and releases a variety of hormones that regulate numerous physiological processes in the...