Anatomy of "Magic Wands"
Part-1
When I say that all humans have their own magical wands, that will not be a lie. For they are our powerful and versatile arms that I am talking about. From the very first civilization till now everything that man has done is shaped by our hands. The history of human kind started when we lifted those two arms of the land high in he air.
When we discuss about the anatomy of hand and arm we witness some finest pieces of art of nature. Complex muscle groups and bones work in synchronization to even lift a cup of coffee from the table or write the simplest of words.While having a discourse about hand we will divide our field of discussion in four parts-
- The bone system or osteology
- The muscle system
- The nervous system in fore limbs
- The circulatory system
Osteology
The osteology of hand and arm is somewhat easy to understand, one of the 3 longest bones, humerus and starts from the from our shoulder joint and ends at the meeting joint with ulna and radius at the elbow region. The simple hinge joint at the elbow proposes simple oscillatory motion.
The humerus is connected to shoulder grids with the help of rotatory joint formed by humerus head and scapula.The total arm structure is supported by clavicle or the "collar bone"
The humerus ends at elbow joint is formed by lateral epicondyle, humeral capitulum, radial and ulnar heads including Fossas and flexor digitoram sublimis. The radius and ulna are other two long bones present in the arm and have capacity to bear heavy weights and tension.The ulna and radius meets with the hand at wrist joint. The hand bones comprises of the 8 "Carpal" bones, Four of these are organized into a proximal row which articulates with the bones of forearms and other four in a distill row that articulates with the five metacarpals. These metacarpals thus join with the phalanges making metacarpophalangeal joint. The phalanges which are 14 in number make up the fingers of the hand.
