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Anatomical terms of muscle. [ edit on Wikidata] 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 ...
Sep 27, 2024 · The thenar muscles are three short muscles located at the base of the thumb. The muscle bellies produce a bulge, known as the thenar eminence. They are responsible for the fine movements of the thumb. The median nerve innervates all the thenar muscles. Opponens Pollicis. The opponens pollicis is the largest of the thenar muscles, and lies ...
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Nov 13, 2023 · These muscles originate from different carpal bones and distally attach to the thumb. The majority of the thenar muscles are innervated by the median nerve (T1). The exception is the deep head of flexor pollicis brevis, which together with the adductor pollicis muscle, receives innervation via the ulnar nerve (C8, T1).
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- Median nerve (T1), ulnar nerve (C8, T1)
The muscles of the thenar and the hypothenar eminence along with the adductor compartment make up the intrinsic muscles of the hand. Their origin and insertion is within the carpal and metacarpal bones and are surrounded by ligaments, and fascia of the hand. They help with fine motor movements of the hands. [3]
May 12, 2023 · The adductor pollicis is another muscle in the thenar area, sometimes counted as the fourth thenar muscle. It originates via two heads, from the bases of the 2nd and 3rd metacarpal and the capitate bone. Like the FPB and APB, this muscle also inserts into the base of the 1st proximal phalanx. The actions of this muscle are antagonistic to those ...
Nov 13, 2023 · Together, these muscles are expert movers of the little finger (fifth digit); they abduct, flex, and bring it towards the thumb to facilitate opposition. The last three groups of hand muscles, that is the lumbricals , dorsal interossei , and palmar interossei , are situated in the deepest layer of the hand and are commonly taken together as one big group called the metacarpal muscles of the hand.
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May 28, 2019 · Muscle weakness. People with weakened thenar eminence muscles may grip objects less soundly and be more prone to dropping them. Pain. Most related pain may radiate from the base of the thumb ...
