The only human body part that does not grow after birth is the ossicular chain, which is composed of three small bones and is located in the middle ear. These bones are also the smallest lightest bones in the human body. Each bone is smaller than a grain of rice. The stapes is the smallest and is only 2.8 millimeters or 0.11 inch long.Know More
Attached to the eardrum, these tiny bones work together to transmit vibrations from sound waves to the fluid in the inner ear. They are found in the middle ears of all mammals. These bones, named after the objects they resemble, are the malleus, or hammer, the incus, or anvil, and the stapes, or stirrup.
A common misconception is that the eyes do not grow from infancy. However, the human eye grows about one-third in size. At birth, the eyeball is 16 millimeters wide, but it grows to 23 millimeters in width by the age of 3 years. Eyes reach their maximum size at puberty, growing to be approximately 24 millimeters wide each.
Humans are born with about 300 bones. However, because some bones fuse together in the course of development, the adult human body has only 206 bones.Learn more in Human Anatomy
The heart is part of the cardiovascular system and works like a pump to move blood throughout the body. The cardiovascular system also consists of the veins, arteries and capillaries that route blood throughout the body, according to WebMD.Full Answer >
The primary function of the respiratory system is to provide oxygen to every part of the body through the process of inhaling oxygen and exhaling carbon dioxide. The respiratory system consists of tissues and organs inside the body that allow people to breathe. This system includes blood vessels, the lungs, airways and certain muscles. The major airways of the respiratory system include the nose, windpipe, mouth, bronchial tubes and larynx.Full Answer >
The three small bones that are found in the ear include the malleus, incus and stapes. The bones are referred to as the hammer, anvil and stirrup.Full Answer >
The Eustachian tube is used to equalize air pressure between the middle ear and the surrounding area, but it is also used to drain mucus from the middle ear. Keeping the pressure in a person's head equalized helps with balance and preventing dizziness. The removal of mucus keeps infection from spreading to the middle ear.Full Answer >