Human limb is an important part of the human body. The limb comprises of foot, thigh and hip region. There are ample functions of legs. Primarily they are used for standing, walking, jumping, kicking and running. The legs constitute a significant portion of person’s mass.
In humans the actual leg is that part of the human body that lies between the knee and the ankles. The portion between the knee and the pelvis is referred to as the thigh. The leg as it is observed is the manifestation of centuries of evolutions. The upper limb is so adapted such that it aids visually guided manipulation. The lower limb is so adjusted such that it helps in movement and locomotion. In humans legs help to stand erect and ensure that the body weight is evenly distributed on them.
The human body is a bag of bones. The major long bones of the human leg are the thigh bone, shin bone and the fibula. The knee has the knee cap also known as patella. The legs are muscular and fleshy. The muscle movements aid in locomotion. Since the legs need strength to continue the muscular movement throughout the day therefore they require a steady supply of oxygenated blood. The blood supply is provided by a network of veins in the pelvis area of the human body. The artery enters the pelvis area and then the thigh to distribute oxygenated blood. The oxygenated blood distribution in the legs helps to nourish the different cells and tissues of the legs.
Excessive muscular fatigue even results in the accumulation of lactic acid that enhances fatigue. The presence of a network of veins in the legs aids collection of the deoxygenated blood so that the same can be purified in the lungs and then pumped by the heart to the rest of the body. The leg veins have to withstand too much load as they transport the deoxygenated blood against the gravity. The veins are provided with adequate valves that helps prevent the flow of the blood under the action of gravity.
Legs are provided with adequate muscles. The presence of so many muscles adds to the weight of this part of the body. Also these muscles add to the strength of the legs. This thus aids in standing as well as moving and making numerous manoeuvres. But there are situations when excessive load on the legs make them fatigued and this results in a number of vein dysfunctions. Sometimes the dysfunctions are so acute that they can also lead to paralysis. Therefore it is always advised to take precautions and ensure that the legs remain healthy and fit.
Interesting Facts about Legs
For these often adequate measures are adopted in their lifestyle by health conscious persons. It is always suggested to consult doctors and take medications if there are any issues so far as the legs are concerned. Proper timely medication often results in sustaining the health of the legs. Instead if timely diagnosis of issues related to the health of legs are not done and proper medication is not resorted to then it may so happen that the doctors at a later stage amputate the legs of the patient. This condition is traumatic as it bereaves the patient of his or her ability to move rendering him or her permanently disabled.
The legs are connected well by nerves to the brain. The foot of the leg is the place where all the nerves of the body meet and therefore is hypersensitive. It can easily sense hot, cold, other objects and thereby generate signals to be transmitted by the central nervous system to the brain for processing. At the cerebral cortex of the brain interpretation is done to generate a response. After a response is generated the body responds to such response and performs the actions. And all this is performed within a fraction of a second. It has been researched and found that the right leg is controlled by the left lobe of the brain and the left leg is controlled by the right lobe of the brain. It is also ensured that there is no problem with the nerves of the human body as any issue with these nerves can lead to paralysis of the body thereby making the legs ineffective.