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39.2 The Human Skeletal System -- Part 2
The humerus is a long bone.
The longitudinal section of Figure 39.4 shows that when the bone is split open, it is not solid but has a medullary cavity at the sides and at the ends.
There is a thin shell of bone and a layer of hyaline.
Yellow bone marrow is a fat-storage tissue in an adult long bone.
Red bone marrow can be found beneath the spongy bone.
The enlargement and micrograph shows that the central shaft has yellow bone marrow and is bordered by compact bone.
The central canals contain blood vessels and nerves.
The bone is still designed for strength despite being lighter.
The lines of stress follow the solid portions of the bone.
Red bone marrow is a specialized tissue that produces blood cells.
White blood cells are part of the immune system.
There are 206 bones in a human skeleton.
There are 80 bones in the skeleton.
The bones of the appendicular skeleton are blue.
Some bones are not shown.
The skull is made up of the cranium and facial bones.
The weight of the skull is reduced by the air spaces in the cranium's hollow bones.
The mastoid sinuses drain into the middle ear.
Mastoiditis is a condition that can lead to deafness.
The skull has the cranium and facial bones.
The forehead is the main bone, followed by the zygomatic arches and the maxillae.
The chin projection is on the mandible.
The major bones of the cranium are the same as the brain.
The forehead and parietal bones are on the top of the cranium.
Each temporal bone has an opening that leads to the middle ear.
The base of the skull is formed by the occipital bone in the rear of the skull.
The temples of the forehead are flattened by the sphenoid bones.
The forehead and supraorbital ridges are formed by the frontal bone.
The bones of the nose and frontal bone are joined by glasses.
The maxillae, the zygomatic bones, and the nasal bones are the most prominent of the facial bones.
The lower jaw is the only part of the skull that can be moved, and it allows us to chew our food.
The maxillae is where the upper jaw and portion of the hard palate are located.
The cheekbone prominences and the nose bones form the bridge of the nose.
The nose is divided into two regions by bones.
The nose is a mixture of bones, cartilage, and other tissues, unlike the ears which are formed only by bone.
The lips and cheeks have muscles.
The head and trunk are supported by the bones of the spine.
The longitudinal axis is an anchor for the other bones of the skeleton.
The spine makes up the column.
The neck, thorax, lower back, and coccyx comprise the spine.
The strength and resilience of an upright posture is provided by the four curves of the vertebral column.
The intervertebral disks are made of fibrocartilage.
They absorb shock caused by movements such as running, jumping, and even walking and prevent the vertebrae from grinding against one another.
As we bend forward, backward, and from side to side, the disks allow the spine to move.
These disks can herniate and break if they are weakened.
The disk can be removed if the body heals itself.
The flexibility of the body is limited if the vertebrae can be fused together.
The rib cage has ribs, costal cartilages, and the breastbone.
The rib cage is made up of the thoracic vertebrae, 12 pairs of ribs, costal cartilages, and the breastbone.
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