Carpal tunnel syndrome (By Alex and Marquitos)

Carpal tunnel syndrome (CTS), is a dissease of the nervous system , the nerves are not conected in the right form or there are a problem in the axons, it can produce a lot a sympthoms. 
And it is one of the most common laboral disseases.

Carpal tunnel syndrome occurs when the median nerve, which go from the forearm into the palm of the hand, becomes pressed or squeezed at the wrist. The median nerve controls sensations to the palm side of the thumb and fingers (although not the little finger), as well as impulses to some small muscles in the hand that allow the fingers and thumb to move. The carpal tunnel - a narrow, rigid passageway of ligament and bones at the base of the hand - houses the median nerve and tendons. Sometimes, thickening from irritated tendons or other swelling narrows the tunnel and causes the median nerve to be compressed. The result may be pain, weakness, or numbness in the hand and wrist, radiating up the arm.




Carpal tunnel syndrome is common in people who perform repetitive hand and wrist. Typing on a computer keyboard is probably the most common cause of this syndrome. Other causes include:

    

    
    



     * Sew
     * Driving
     * Work on an assembly line
     * Paint
     * Write
     * Use tools (especially hand tools or tools that vibrate)
     * Sports such as racquetball and handball
     * Playing musical instruments

The condition often occurs in people 30 to 60 years and is more common in women than in men.

Many health problems are associated with carpal tunnel syndrome, including:

     * Bone fractures and arthritis of the wrist
     * Acromegaly
     * Diabetes
     * Alcoholism
     * Hypothyroidism
     * Renal and Dialysis
     * Menopause, premenstrual syndrome (PMS) and pregnancy
     * Infections
     * Obesity
     * Rheumatoid arthritis, lupus erythematosus (SLE) and scleroderma

Liger (By Marcos and Alex)

This post is dedicated to a extrange and unusual creature, the Liger

The liger is the product of the hibridation of a female tiger with a male lion, but is very different, and have strange caracteristics:

The liger is very bigger than the other felins, present the aspect of a lion with tiger stripes and lion mane.


The liger can size 4 meters and weight 500 kilograms, this is because the growth inhibitory gene is transmitted maternally in lions and tigers paternal, so the liger does not inherit any genes of this type and grows throughout life, reaching incredible size.

The liger is in the most of cases steril, but sometimes a liger can reproduce with another lion or tiger creating a le-liger or a ti-liger



This is the oposite case of the Tigon, borned by a cross o female lion and male tiger, who is more stilished and small and less usual because people hunt them with more facility.


Human influence is precisely responsible for the existence of ligers. Tigers and lions generally do not share territories, so that would be unlikely to meet to form this strange intersection. Currently lions and tigers coexist in nature only in the Gir Forest in India.

The Brain (By Marcos and Alex)

The brain is the main organ of the nervous system, and the organ who difference us more, from the rest of the animals of the planet.


The brain is the organ that is responsible for the sense, thought, memory and body control. The human brain is a relatively small, weighing about 1.5 kilograms and takes about 2 percent of body weight. It is surrounded by a skull for a physical protection.
And it is formed by 30.000 millions of neurons formed a grey-pink tissue.

• The brain is divided into two hemispheres (left and right), each consisting of four lobes (frontal, parietal, occipital and temporal). The outer layer of the brain called the cerebral cortex or "gray matter". It covers the deep nuclei located in the cerebral hemisphere called "white matter".

• Cerebellum: responsible for psychomotor function, the cerebellum coordinates the inner ear sensory input and muscle for adequate control of the position and movement.

• Brainstem: at the base of the brain, forms the link between the cerebral cortex, white matter and spinal cord. Involved in the control of breathing, sleep and circulation.

• Thalamus and hypothalamus: The thalamus has a wide range of connections with the cortex and many other parts of the brain, as the basal ganglia, hypothalamus and brain stem. You can feel the pain but does not locate precisely. The hypothalamus has several important functions, including appetite control, sleep patterns, sexual behavior and response to anxiety.´

• Basal ganglia:The caudate nucleus, putamen and globus pallidus and basal ganglia are involved in controlling movement. These highly specialized groups of cells / nuclei are located in the white matter behind the cerebral cortex.

The brain is billateral, have two parts exactly alike, but the left part controlls the right part of the body or vice versa.

The first the first indication of the existence of the first brains was in the Cambrian explosion, from this, the brains evolved a lot, and we still fight for complain it.

SAN ANDREAS FAULT

The San Andreas Fault is a big and amazing Strike-Slip fault, one of the biggest in the world, is located in the Peninsule of California, it s a passive boundarie, formed by the North-American plate and Pacific plate, the Pacific plate move to the north (with California), and North-American plate move to the south, the friction with each other and the separation of join rocks, forms terrible earthquakes, that plague the area. In the future California will be an island and in 50 millions years it will be in Alaska.
Actually the earthquakes in California are not a problem, because the constructions are earthquake-proof.

The most importants modern earthquakes was:
1857 Fort Tejon earthquake: about 217 miles (349 km) were ruptured in central and southern California.Only two deaths were reported. The magnitude was about 7.9.
1906 San Francisco earthquake: about 267 miles (430 km) were ruptured in Northern California. The epicenter was near San Francisco. At least 3000 people died in the earthquake and subsequent fires. This time the magnitude was estimated to be 7.8.


BY: Marcos and Alex