The dermis is called the "true skin" because it contains blood vessels, nerves, sweat glands, hair follicles, and connective tissues that support the epidermis. The epidermis is the outermost layer, and the subcutaneous tissue lies beneath the dermis.
The hair bulb is located at the base of the follicle and contains the dermal papilla, which supplies nutrients necessary for hair growth. The hair shaft is the visible part, and the cuticle is the outer layer of the hair strand.
The femur, or thigh bone, is the largest and strongest bone in the body. It supports the body’s weight and is critical for movement. The tibia and humerus are smaller, and the pelvis is a bone structure rather than a single bone.
The central nervous system consists of the brain and spinal cord. Peripheral nerves are part of the peripheral nervous system, which connects the central nervous system to the rest of the body.
