Difference between revisions of "Arm"
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An '''arm''' is a particular upper [[limb]] appendage having varying usage and strength within the animal kingdom. In humans it is made up of three distinct [[bone]]s: | An '''arm''' is a particular upper [[limb]] appendage having varying usage and strength within the animal kingdom. In humans it is made up of three distinct [[bone]]s: | ||
| − | * Humerus | + | * Humerus (upper arm) |
| − | * Radius | + | * Radius (outer bone of the forearm, when supinated) |
| − | * Ulna | + | * Ulna (inner bone of the forearm, when supinated) |
The hands have these bones: | The hands have these bones: | ||
| − | * Carpals | + | * Carpals ("wrist bones") |
| − | * Metacarpals | + | * Metacarpals (longer bones in the "palm") |
| − | * Phalanges | + | * Phalanges (s. phalanx; two in the pollex, or thumb; three four the remaining four fingers) |
The upper region of the arm has the following muscles: | The upper region of the arm has the following muscles: | ||
| Line 17: | Line 17: | ||
The forearm has these muscles: | The forearm has these muscles: | ||
| − | * Brachioradialis (connects | + | * Brachioradialis (connects) |
* Supinator (turns forearm up) | * Supinator (turns forearm up) | ||
* Pronator quadratus (turns forearm down) | * Pronator quadratus (turns forearm down) | ||
Latest revision as of 23:14, July 23, 2016
For the processor architecture, see ARM (computing)
An arm is a particular upper limb appendage having varying usage and strength within the animal kingdom. In humans it is made up of three distinct bones:
- Humerus (upper arm)
- Radius (outer bone of the forearm, when supinated)
- Ulna (inner bone of the forearm, when supinated)
The hands have these bones:
- Carpals ("wrist bones")
- Metacarpals (longer bones in the "palm")
- Phalanges (s. phalanx; two in the pollex, or thumb; three four the remaining four fingers)
The upper region of the arm has the following muscles:
- Deltoid ("shoulder", anterior, lateral, and posterior sections)
- Biceps brachii (the front, two heads)
- Triceps brachii (the back, three heads)
The forearm has these muscles:
- Brachioradialis (connects)
- Supinator (turns forearm up)
- Pronator quadratus (turns forearm down)
- Flexor carpi radialis (flexes forearm)
- Flexor digitorum superficialis (flexes fingers)
- Flexor pollicis longus (flexes thumb)
- Extensor carpi radialis longus and brevis (straightens forearm)
- Extensor carpi ulnarus (straightens forearm)
- Extensor digitorum (straightens fingers)
Also, the hands have many muscles for fine control of the fingers.
