The axial skeleton,..makes up 80 of your 206 bones, includes skull bones -made up of 22 cranial or facial bones, plus the three in each ear. vertebral or spinal column, made of 26 bones, on chest -12 ribs,
The appendicular skeleton, The Upper Appendages and lower appendages 126 refers to your arms and legs.
The appendicular skeleton refers to your arms and legs. They are called appendicular (from "append") because they are attached by girdles, which bridge each with the main body, as if they had been appended after the main body was formed. These girdles give these appendages a remarkable range of movement unique from anywhere else in the body. Obviously the arms are the same allowing symmetry, and the legs are too. But ignoring size and shape, and instead focusing on joints and relative placement, your arms and legs are the same, too.
The pectoral-sound, or shoulder, girdle connects the arm to the axial body. The scapula-sound, or shoulder blade, and the clavicle, or collarbone, make up the girdle.
The Upper Appendages
The main purpose of the arms is to do work. They are lighter and are made to focus on detail.
In your upper arm is your humerus which connects to the girdle as a ball-and-socket joint. It connects to your forearm with a hinge joint. The forearm is really two bones, the radius-sound and the ulna-sound. The ulna is the bone that joins with the humerus-sound in the elbow joint. Having two bones instead of one allows for a wide range of twisting of the wrists.
The Hand
The carpus, or wrist of the hand, is made of eight small bones in two irregular rows connect with gliding joints. These eight bones give your wrist the flexibility it has.
Five metacarples-sound extend from the carpus, covered with skin, form the palm. Looking at just the skeleton, they look like the base of really long fingers. The tips of these bones are the knuckles you see when you make a fist. At the beginning of this, the skeletal, topic, one of the characteristics that make the human skeleton unique is the opposable thumb. The first metacarpal, the thumb base, is jointed differently that the rest of the metacarples. They lay in a single plane, while the thumb metacarpal is connected with a saddle joint, giving it a range of movement. This is what makes grasping things as easy as it is.
The rest of the hand comprises the phalanges, what we see as the fingers. Each finger has three phalanges, except for the thumb, which has two.
The Lower Appendages
As said earlier, the upper and lower appendages are structurally similar. One difference is that the lower appendages are thicker and stronger to support the incredible stress put on them when running and jumping. They are designed mostly for movement
The pelvic-sound, or hip, girdle does the same thing as the upper body girdles. One major difference is that the two girdle in the upper body are replaced by one for the lower body.
The femur is the lower appendage equivalent of the humerus. It's the longest, largest and strongest bone of the body.
2007-11-13 05:30:45
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answer #1
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answered by viji_feb8 1
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The answer is 206. I remember that number because I was once assigned to the 206th Signal Company starting at Fort Gordon, Georgia.
An Army unit has nothing to do with bones except for the several bone-heads I encountered in the unit.
2007-11-13 05:25:12
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answer #2
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answered by Guitarpicker 7
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