Thumb Muscle Anatomy
This tendon also travels along the back of the thumb and helps straighten the thumb but it connects the muscle in the back of the forearm to the bone at the tip of the thumb. The thumb shares the following with each of the other four fingers.
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The muscles acting on the thumb can be divided into two groups.
Thumb muscle anatomy. This includes longus and brevis descriptions. The thumb generally receives oxygenated blood by the princeps pollicis artery. The muscles of the thumb are nine skeletal muscles located in the hand and forearm.
The muscles of the thumb all contain the word pollicis and are distinguished by extensor flexor oppenens and abductor designations. The muscles allow for flexion extension adduction abduction and opposition of the thumb. The thenar muscle group is found at the base of the thumb forming the muscle bulk on the thumb side of the hand.
It connects the muscle in the back of the forearm to the bone in the middle of the thumb. Having a dorsal surface that features hair and a nail and a hairless palmar aspect with fingerprint ridges. The first dorsal interosseus also serves the thumb.
The extrinsic hand muscles with their muscle bellies located in the forearm and the intrinsic hand muscles with their muscles bellies located in the hand proper. It is comprised of three muscles. Having a skeleton of phalanges joined by hinge like joints that provide flexion toward the palm of the hand.
Despite their small size theyre very important for controlling fine thumb movements such as grabbing and pinching. The thenar eminence is a group of three small muscles at the base of the thumb. The abductor pollicis brevis the flexor pollicis brevis and the opponens pollicis.
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