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Posted on March 8th, 2013, by

The human anatomy is quite complex and some parties of the body have a complex structure. At the same time, the human body has a complex structure and its parts are particularly important for humans but they have a complex structure, such as arm. At this point, it is worth mentioning the fact that the arm can be viewed in narrower context, from the shoulder to the forearm. However, as a rule, the structure of the arm is viewed as the whole including the hand, wrist and forearm.

The structure of the arm should be viewed as a complex connection of bones, which are united together closely to provide humans with the possibility to move the hand freely within the framework which are natural for humans. In such a way, human arm is quite complex and comprises a large number of bones connected together and moving by the muscles.

The appendicular skeleton is the second division of the human skeleton. It includes the two supportive frames called the pectoral and pelvic girdles and their attached limbs, the arms and legs. Each girdle is supportive bony structures that is secured to the axial skeleton by ligaments and muscles (Tharpe & Gallimore, 1988). In this regard, it is important to place emphasis on the fact that the arm has the structure, which provides the range of movements essential for functioning of human body properly.

The uppermost bone of the arm is called the humerus. Its upper end fits into a saucer-shaped socket on the scapula. This attachment (joint) is stabilized by muscles and tendons and permits a wide range of movement. The lower end of the humerus joins with the two bones of the lower arm, the ulna and radius, forming what is called the elbow. When an individual accidentally bumps his or her elbow at the crazy bone, he or she may feel a tingling sensation. The tingling sensation results from hitting the ulnar nerve, which passes along the back of the elbow (Tharpe & Gallimore, 1988).

The lower end of the ulna and radius is attached to a group of bones called the carpal bones that form the wrist. The palm of the hand contains the metacarpal bones. The fingers, or phalanges, consist of bones that join with the metacarpal bones (Tharpe & Gallimore, 1988).

The arm structure can be briefly presented in the following image, which defines the main bones comprising the structure of the arm.

The arm structure:

The bones and features labeled are the Humerus, Radius, Ulna, the eight Carpal bones, the five Metacarpal bones, and the fourteen Phalanges (Vygotsky, 1962).

In such a way, the arm structure comprises long and short bones, including Ulna, Radius, and Humeus as the longest bones of the arm and phalanges as the shortest bones of the arm. At the same time, each bone, from the longest to the shortest one performs its own function and plays an extremely important role in the functioning of the arm as the whole. In this regard, it is worth mentioning the fact that the long bones provide the arm with the essential stamina and lift of large weights for instance. In stark contrast, short and small bones, such as phalanges, provide the arm with the essential flexibility. For instance, phalanges help the arm to make such movements as folding and grasping. These movements are essential for the normal functioning of the arm and al the bones should function properly. In such a context, the close connection between each bone is essential for the normal functioning of the bone. The interaction between all bones is essential and provides the arm with the possibility to perform multiple functions. At this point, it is important to place emphasis on the fact that the arm plays the crucial role in the functioning of human body. The arm is essential for the normal functioning of human body and performance of basic functions.

In such a context, it is worth mentioning the fact that the human arm is vulnerable to the risk of the development of different physical injuries because the high activity of the arm makes it exposed to the increased physical pressure and increases the risk of occasional injuries.

At the same time, the structure of the arm also makes it vulnerable to injuries, including bone fractures. However, the structure of the arm can be protected through the regulation of the level of calcium, which prevents bones of the arm from becoming fragile.

Thus, taking into account all above mentioned, it is important to place emphasis on the fact that the structure of the arm is complex. The arm comprises both long and short bones. At the same time, the bones of the arm are closely connected to each other and interact with each other effectively to maintain the basic functions of the arm.

References
Tharpe, R. G. & Gallimore, R. (1988). Rousing minds to life. Cambridge, MA. Cambridge University Press.
Vygotsky, L. (1962). Thought and language. Cambridge, MA. MIT Press.

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