Thumb Anatomy Muscles

This includes longus and brevis descriptions. The abductor pollicis brevis the flexor pollicis brevis and the opponens pollicis.

Thenar Muscles Anatomy Innervation And Function Kenhub

It is unique to humans.

Thumb anatomy muscles. The thumb shares the following with each of the other four fingers. Muscles of the hand thenar muscles. Having a dorsal surface that features hair and a nail and a hairless palmar aspect with fingerprint ridges.

The muscles allow for flexion extension adduction abduction and opposition of the thumb. It starts as a muscle in the forearm and then travels as a tendon in the wrist through the carpal tunnel. 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.

The thenar muscle group is found at the base of the thumb forming the muscle bulk on the thumb side of the hand. The muscles of the thumb are nine skeletal muscles located in the hand and forearm. Intrinsic thenar abductor pollicis brevis adductor pollicis first dorsal interosseous flexor pollicis brevis opponens pollicis extrinsic abductor pollicis longus extensor pollicis brevis extensor pollicis longus flexor pollicis longus.

It is then covered by a tunnel or sheath and inserts into the most distal farthest from your body bone in the thumb. The muscles acting on the thumb can be divided into two groups. The muscles of the thumb all contain the word pollicis and are distinguished by extensor flexor oppenens and abductor designations.

Anatomy home page. 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 hypothenar muscles produce the hypothenar eminence a muscular protrusion.

The flexor pollicis longus tendon bends the thumb. Muscles of the thumb. It connects the muscle in the back of the forearm to the bone in the middle of the thumb.

The first dorsal interosseus also serves the thumb. 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.

These are four lumbricals in the hand each associated with a finger. The thumb generally receives oxygenated blood by the princeps pollicis artery. The thenar muscles are three short muscles located at the base of the thumb.

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