Anatomy Of Thumb
It differs from other digits in having only two phalanges tubular bones of the fingers and toes. It also sends a nerve branch to control the thenar muscles of the thumb.
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The hand is a very complex part of the body and all of the parts of the upper extremity are essential to functioning hands.
Anatomy of thumb. The upper extremity is a term used to define the upper limb. This includes longus and brevis descriptions. Extensor pollicis brevis.
The thumb is capable of opposition abduction adduction and retropulsion in addition to flexion and extension. This tendon travels along the back of the thumb and helps straighten the thumb. Having a skeleton of phalanges joined by hinge like joints that provide flexion toward the palm of the hand.
This tendon helps you move the thumb away from the palm to form an open hand. This tendon helps you bend the thumb. The thumb shares the following with each of the other four fingers.
Thumb also called pollex short thick first digit of the human hand and of the lower primate hand and foot. The thenar muscles help move the thumb and let you touch the pad of the thumb to the tips each of each finger on the same hand a motion called opposition. The muscles of the thumb all contain the word pollicis and are distinguished by extensor flexor oppenens and abductor designations.
Having a dorsal surface that features hair and a nail and a hairless palmar aspect with fingerprint ridges. Tables and diagrams summarizing the movements and innervation of the fingers and thumb are provided figure 5 and figure 6 and figure 7 and table 1 and table 2 and table 3. The thumb also differs in having much freedom of movement and being opposable to tips of other digits.
This nerve gives sensation to the thumb index finger long finger and half of the ring finger. The first dorsal interosseus also serves the thumb. The thumb generally receives oxygenated blood by the princeps pollicis artery.
There are four thumb tendons. This includes the shoulder arm forearm wrist and hand. The thumb is discussed below see thumb anatomy below.
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