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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]
[1] [2] If sharp pain occurs along the distal radius (top of the forearm, about an inch below the wrist), de Quervain syndrome is likely. While a positive Finkelstein test is often considered pathognomonic for de Quervain syndrome, the maneuver can also cause some pain in those with osteoarthritis at the base of the thumb. [2]
It pierces the palmar carpal ligament, and divides into a lateral and a medial branch; . The lateral branch supplies the skin over the ball of the thumb, and communicates with the volar branch of the lateral antebrachial cutaneous nerve.
It usually begins as small, hard nodules just under the skin of the palm, [2] then worsens over time until the fingers can no longer be fully straightened. While typically not painful, some aching or itching, or pain, [7] may be present. [2] The ring finger followed by the little and middle fingers are most commonly affected. [2]
In the palm of the hand, the median nerve is covered by the skin and the palmar aponeurosis, and rests on the tendons of the Flexor muscles.Immediately after emerging from under the transverse carpal ligament the median nerve becomes enlarged and flattened and splits into a smaller, lateral, and a larger, medial portion.
The pain frequently occurs at night and can even radiate to the shoulder. Even though the diagnosis is straightforward, the treatment is surgical decompression of the median nerve after deroofing of the carpal tunnel. [3] Dupuytren's contracture is another disorder of the fingers that is due to thickening of the underlying skin tissues of the ...
At this position, the nerve gives off the palmar cutaneous branch that supplies the skin of the central portion of the palm. [citation needed] The nerve continues through the carpal tunnel into the hand, lying in the carpal tunnel anterior and lateral to the tendons of the flexor digitorum superficialis. Once in the hand, the nerve splits into ...
The muscles of hypothenar eminence are from medial to lateral: Opponens digiti minimi; Flexor digiti minimi brevis; Abductor digiti minimi; The intrinsic muscles of hand can be remembered using the mnemonic, "A OF A OF A" for, Abductor pollicis brevis, Opponens pollicis, Flexor pollicis brevis (the three thenar muscles), Adductor pollicis, and the three hypothenar muscles, Opponens digiti ...