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The thenar eminence refers to the group of muscles on the palm at the base of the thumb. The three muscles composing the thenar eminence are the abductor pollicis brevis, flexor pollicis brevis and opponens pollicis. [5] The other two muscles that influences movement of the thumb are the adductor pollicis and the first dorsal interosseous muscle.
The extrinsic muscle groups are the long flexors and extensors. They are called extrinsic because the muscle belly is located on the forearm. The intrinsic group are the smaller muscles located within the hand itself. The muscles of the hand are innervated by the radial, median, and ulnar nerves from the brachial plexus. [1]
The Phalanges of the Hand The flat, wide expansions found at the tips of the distal phalanges are called apical tufts. They support the fingertip pads and nails. [ 11 ] The phalanx of the thumb has a pronounced insertion for the flexor pollicis longus (asymmetric towards the radial side), an ungual fossa, and a pair of unequal ungual spines ...
The tendon is finally inserted on the base of the distal phalanx of the thumb. [ 1 ] 6.7 to 9.7 centimetres (2.6 to 3.8 in) in length, the tendon passes through a long and superficial synovial sheath which, passing obliquely from the radial border of the forearm into the thumb, extends from the proximal border of the extensor retinaculum to the ...
The base of the distal phalanx of the thumb: Artery: Anterior interosseous artery: Nerve: Anterior interosseous nerve (branch of median nerve) (C8, T1) Actions: Flexion of the thumb: Antagonist: Extensor pollicis longus muscle, extensor pollicis brevis muscle: Identifiers; Latin: musculus flexor pollicis longus: TA98: A04.6.02.037: TA2: 2492 ...
The distal pad of the human thumb is divided into a proximal and a distal compartment, the former more deformable than the latter, which allows the thumb pad to mold around an object. [9] In robotics, almost all robotic hands have a long and strong opposable thumb. Like human hands, the thumb of a robotic hand also plays a key role in gripping ...
base of distal phalanx of hallux: fibular artery (peroneal branch of posterior tibial artery: tibial nerve, S1, S2 nerve roots flexes all joints of big toe, plantarflexes ankle: extensor hallucis longus: 2 1 flexor digitorum longus: Lower Limb, Leg, Posterior compartment, Deep, tarsal tunnel: medial tibia: distal phalanges of lateral four digits
The muscle fans out into four tendons (one to each of the second to fifth fingers) to the palmar base of the distal phalanx. [3] Along with the flexor digitorum superficialis, it has long tendons that run down the arm and through the carpal tunnel and attach to the palmar side of the phalanges of the fingers. [4]