The flexors allow for the actual bending of the fingers. The thumb has one long flexor and a short flexor in the thenar muscle group.
The human thumb also has other muscles in the thenar group opponens and abductor brevis muscle , moving the thumb in opposition, making grasping possible.
The extensors are located on the back of the forearm and are connected in a more complex way than the flexors to the dorsum of the fingers. The tendons unite with the interosseous and lumbrical muscles to form the extensorhood mechanism. The primary function of the extensors is to straighten out the digits. The thumb has two extensors in the forearm; the tendons of these form the anatomical snuff box. Also, the index finger and the little finger have an extra extensor, used for instance for pointing.
The extensors are situated within 6 separate compartments. The 1st compartment contains abductor pollicis longus and extensor pollicis brevis. The 2nd compartment contains extensors carpi radialis longus and brevis.
The 3rd compartment contains extensor pollicis longus. The extensor digitorum indicis and extensor digitorum communis are within the 4th compartment. Extensor digiti minimi is in the fifth, and extensor carpi ulnaris is in the 6th.
The intrinsic muscle groups are the thenar and hypothenar muscles thenar referring to the thumb, hypothenar to the small finger , the dorsal and palmar interossei muscles between the metacarpal bones and the lumbrical muscles. The lumbricals arise from the deep flexor and are special because they have no bony origin and insert on the dorsal extensor hood mechanism.
Aside from the genitals , the fingertips possess the highest concentration of touch receptors and thermoreceptors among all areas of the human skin, [ citation needed ] making them extremely sensitive to temperature, pressure, vibration, texture and moisture.
Recent studies suggest fingers can feel nano-scale wrinkles on a seemingly smooth surface, a level of sensitivity not previously recorded. Dtsch Arztebl Int. Arthritis Foundation.
Araki K, Oiwa H. Acute Arthritis of the Fingers in an Elderly Woman. Intern Med. Prevalence and distribution of cartilage damage at the metacarpal head level in rheumatoid arthritis and osteoarthritis: an ultrasound study.
Rheumatology Oxford. Open Rheumatol J. Jerosch J. Int J Rheumatol. Does occupational therapy reduce the need for surgery in carpometacarpal osteoarthritis? Protocol for a randomized controlled trial.
The condition is also more common in women and in anyone with diabetes. Treatment of trigger finger varies depending on the severity. Trigger finger care at Mayo Clinic. Trigger finger can affect any finger, including the thumb. More than one finger may be affected at a time, and both hands might be involved. Triggering is usually more pronounced in the morning, while firmly grasping an object or when straightening your finger. Seek immediate medical care if your finger joint is hot and inflamed, as these signs may indicate an infection.
If you have any stiffness, catching, numbness or pain in a finger joint, or if you can't straighten or bend a finger, make an appointment with your doctor. Trigger finger generally results from inflammation within a tendon sheath, restricting tendon motion. External Sites. User Reviews. User Ratings. External Reviews. Metacritic Reviews.
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Share this Rating Title: Fingers 6. Please tell us where you read or heard it including the quote, if possible. Test Your Knowledge - and learn some interesting things along the way. Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free! Is Singular 'They' a Better Choice? How many animals can you identify? Can you spell these 10 commonly misspelled words? The dictionary has been scrambled—can you put it back together? It is in excellent preservation; the only parts which are wanting are the finger s of the right hand and the object which it held.
When they reach the mud, these finger s grow down into it and form a new supporting root to the tree. In addition to the idiom beginning with finger.
Slang : Vulgar.Nov 01, · Having stiff fingers can be troubling, as can any loss of mobility. While arthritis is a key cause of finger stiffness, there are others, and a doctor will want to explore the issue thoroughly.