Many organ systems guard, nourish, relay information and support the brain, helping this command centre to ensure that the body functions at its optimum
Bones of the skeletal system like the skull and the vertebral column shield the brain and spinal cord from injury
The blood-brain barrier is a tight network of blood vessels and cells in the brain which allows the entry of nutrients and blocks out infectious agents
Hormones from endocrine glands like thyroid and adrenal glands provide chemical feedback to the brain which influence neural processing
The gut produces several neurotransmitters which make their way to the brain via the vagus nerve, helping maintain overall health
The vestibular system in the inner detects head movements and spatial orientation, sending signals to the brain for balance
Sensory receptors in the skin, hair and nails (integumentary system) relay signals to the brain that help perceive pain and temperature