Difference between revisions of "Arm"
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| + | <small>For the processor architecture, see [[ARM (computing)]]</small> | ||
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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: | ||
| + | * 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. | ||
== Sources == | == Sources == | ||
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.
