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  2. Extrinsic extensor muscles of the hand - Wikipedia

    en.wikipedia.org/wiki/Extrinsic_extensor_muscles...

    The extensor carpi radialis longus (ECRL) has the most proximal origin of the extrinsic hand extensors. It originates just distal to the brachioradialis at the lateral supracondylar ridge of the humerus, the lateral intermuscular septum, and by a few fibers at the lateral epicondyle of the humerus. [1]

  3. Muscles of the hand - Wikipedia

    en.wikipedia.org/wiki/Muscles_of_the_hand

    The muscles of the hand can be subdivided into two groups: the extrinsic and intrinsic muscle groups. 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 ...

  4. Muscles of the thumb - Wikipedia

    en.wikipedia.org/wiki/Muscles_of_the_thumb

    The muscles of the thumb are nine skeletal muscles located in the hand and forearm. The muscles allow for flexion, extension, adduction, abduction and opposition of the thumb. The muscles acting on the thumb can be divided into two groups: The extrinsic hand muscles, with their muscle bellies located in the forearm, and the intrinsic hand ...

  5. Flexor digitorum profundus muscle - Wikipedia

    en.wikipedia.org/wiki/Flexor_digitorum_profundus...

    It is considered an extrinsic hand muscle because it acts on the hand while its muscle belly is located in the forearm. Together the flexor pollicis longus, pronator quadratus, and flexor digitorum profundus form the deep layer of ventral forearm muscles. [2] The muscle is named from Latin 'deep bender of the fingers'.

  6. Abductor pollicis longus muscle - Wikipedia

    en.wikipedia.org/.../Abductor_pollicis_longus_muscle

    An accessory abductor pollicis longus (AAPL) tendon is present in more than 80% of people, and a separate muscle belly is present in 20% of people. In one study, the accessory tendon was inserted into the trapezium (41%); proximally on the abductor pollicis brevis (22%) and opponens pollicis brevis (5%); had a double insertion on the trapezium and thenar muscles (15%); or the base of the first ...

  7. Posterior compartment of the forearm - Wikipedia

    en.wikipedia.org/wiki/Posterior_compartment_of...

    The majority of muscles found in the posterior compartment are extrinsic, meaning that their origin has some distance from the part moved. The brachioradialis and the anconeus are considered intrinsic muscles because they both arise within the forearm and they both move the forearm.

  8. Extensor pollicis longus muscle - Wikipedia

    en.wikipedia.org/.../Extensor_pollicis_longus_muscle

    In human anatomy, the extensor pollicis longus muscle (EPL) is a skeletal muscle located dorsally on the forearm. It is much larger than the extensor pollicis brevis , the origin of which it partly covers and acts to stretch the thumb together with this muscle.

  9. Thenar eminence - Wikipedia

    en.wikipedia.org/wiki/Thenar_eminence

    The thenar eminence is the mound formed at the base of the thumb on the palm of the hand by the intrinsic group of muscles of the thumb. [1] The skin overlying this region is the area stimulated when trying to elicit a palmomental reflex. The word thenar comes from Ancient Greek θέναρ (thenar) 'palm of the hand'. [2]