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<small>For the processor architecture, see [[ARM (computing)]]</small>
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: (Upper arm)
* Humerus (upper arm)
* Radius: (Outer bone)
* Radius (outer bone of the forearm, when supinated)
* Ulna: (Inner bone of the forearm)
* 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 ==