Hand Anatomy Thumb
In this article we shall be looking at the anatomy of the intrinsic muscles of the hand.
Hand anatomy thumb. The hand needs to be mobile in order to position the fingers and thumb. The thumb is the first digit of the hand when a person is standing in the medical anatomical position where the palm is facing to the front the thumb is the outermost digit.
Few structures of the human anatomy are as unique as the hand. The thumb metacarpal can bend and extend the thumb move the thumb away from and toward the hand and spin the thumb on the trapezium.
This complex structure connects the entire hand to the radius and ulna facilitates the passage of tendons together with the above mentioned neurovascular structures from the forearm to the hand and permits us to exploit all its movements. The thumb also differs in having much freedom of movement and being opposable to tips of other digits.
Finger joints knuckles each finger contains 3 joints more commonly known as knuckles. Thumb short thick first digit of the human hand and of the lower primate hand and foot.
The abductor pollicis longus and brevis help move the thumb away from the hand. It works like a hinge when you straighten your fingers and thumb.
The intrinsic muscles of the hand are located within the hand itself. The thumb is the first of the hand s five digits but it is typically not referred to as a finger.
The thumb cmc joint has the most freedom of motion. The largest joint of each finger lies between the finger and the hand.
A hand is a prehensile multi fingered appendage located at the end of the forearm or forelimb of primates such as humans chimpanzees monkeys and lemurs a few other vertebrates such as the koala which has two opposable thumbs on each hand and fingerprints extremely similar to human fingerprints are often described as having hands instead of paws on their front limbs. The medical latin english noun for thumb is pollex compare hallux for big toe and the corresponding adjective for thumb is pollical.
The anatomy of the hand is incomplete without understanding the wrist. It differs from other digits in having only two phalanges tubular bones of the fingers and toes.
The hand also must be coordinated to perform fine motor tasks with precision. This is the.
Two very important ligaments are the dorsoradial and the volar beak ligaments. Adequate strength forms the basis for normal hand function.
The thumb possesses a unique and wide range of motion not shared by the hand s other digits. The hand can be considered in four segments.
Digits that extend from the palm of the hand the fingers make it possible for humans to grip the smallest of objects. The thumb has two knuckle joints.
This first joint at the base of the finger is called the metacarpophalangeal joint mcp.
