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The ear has external, middle, and inner portions. The outer ear is called the pinna and is made of ridged cartilage covered by skin. Sound funnels through the pinna into the external auditory canal, a short tube that ends at the eardrum (tympanic membrane). Sound causes the eardrum and its tiny attached bones in the middle portion of the ear to vibrate, and the vibrations are conducted to the nearby cochlea. The spiral-shaped cochlea is part of the inner ear; it transforms sound into nerve impulses that travel to the brain. The fluid-filled semicircular canals (labyrinth) attach to the cochlea and nerves in the inner ear. They send information on balance and head position to the brain. The eustachian (auditory) tube drains fluid from the middle ear into the throat (pharynx) behind the nose. Brain video
The ear has external, middle, and inner portions. The outer ear is called the pinna and is made of ridged cartilage covered by skin. Sound funnels through the pinna into the external auditory canal, a short tube that ends at the eardrum (tympanic membrane). Sound causes the eardrum and its tiny attached bones in the middle portion of the ear to vibrate, and the vibrations are conducted to the nearby cochlea. The spiral-shaped cochlea is part of the inner ear; it transforms sound into nerve impulses that travel to the brain. The fluid-filled semicircular canals (labyrinth) attach to the cochlea and nerves in the inner ear. They send information on balance and head position to the brain. The eustachian (auditory) tube drains fluid from the middle ear into the throat (pharynx) behind the nose.
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These are the chemicals that send signals from the axon terminal of one neuron to receptors on the dendrite of another neuron through synapses. Different neurotransmitters have different functions. Here are some examples of neurotransmitters and their functions. Dopamine- responsible for reward-inspired learning. Highly addictive drugs such as cocaine act directly on dopamine receptors. Serotonin- Responsible for regulation of mood, sleep, and appetite Epinepherine- (also known as adrenaline) when secreted raises heart rate, dilates airways, constricts blood vessels and helps in the fight or flight reaction. Brain video
These are the chemicals that send signals from the axon terminal of one neuron to receptors on the dendrite of another neuron through synapses. Different neurotransmitters have different functions. Here are some examples of neurotransmitters and their functions. Dopamine- responsible for reward-inspired learning. Highly addictive drugs such as cocaine act directly on dopamine receptors. Serotonin- Responsible for regulation of mood, sleep, and appetite Epinepherine- (also known as adrenaline) when secreted raises heart rate, dilates airways, constricts blood vessels and helps in the fight or flight reaction
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The anterior pituitary gland produces the following hormones and releases them into the bloodstream: Adrenocorticotropic hormone, which stimulates the adrenal glands to secrete steroid hormones, principally cortisol. Growth hormone, which regulates growth, metabolism and body composition. Brain video
The anterior pituitary gland produces the following hormones and releases them into the bloodstream: Adrenocorticotropic hormone, which stimulates the adrenal glands to secrete steroid hormones, principally cortisol. Growth hormone, which regulates growth, metabolism and body composition.
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The human brain is the command center for the human nervous system. It receives input from the sensory organs and sends output to the muscles. The human brain has the same basic structure as other mammal brains, but is larger in relation to body size than any other brains. Brain video
The human brain is the command center for the human nervous system. It receives input from the sensory organs and sends output to the muscles. The human brain has the same basic structure as other mammal brains, but is larger in relation to body size than any other brains.
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The human brain is the command center for the human nervous system. It receives signals from the body`s sensory organs and outputs information to the muscles. The human brain has the same basic structure as other mammal brains but is larger in relation to body size than any other brains. Brain video
The human brain is the command center for the human nervous system. It receives signals from the body`s sensory organs and outputs information to the muscles. The human brain has the same basic structure as other mammal brains but is larger in relation to body size than any other brains.
4K
The human brain is the command center for the human nervous system. It receives signals from the body`s sensory organs and outputs information to the muscles. The human brain has the same basic structure as other mammal brains but is larger in relation to body size than any other brains. Brain video
The human brain is the command center for the human nervous system. It receives signals from the body`s sensory organs and outputs information to the muscles. The human brain has the same basic structure as other mammal brains but is larger in relation to body size than any other brains.
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The brain is one of the largest and most complex organs in the human body. It is made up of more than 100 billion nerves that communicate in trillions of connections called synapses. The brain is made up of many specialized areas that work together: • The cortex is the outermost layer of brain cells. Brain video
The brain is one of the largest and most complex organs in the human body. It is made up of more than 100 billion nerves that communicate in trillions of connections called synapses. The brain is made up of many specialized areas that work together: • The cortex is the outermost layer of brain cells.