Difference between revisions of "Arm"

From Conservapedia
Jump to: navigation, search
(clarification of radius)
(Massive update.)
Line 1: Line 1:
 
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 of the forearm)
+
* 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 remaing 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 ==

Revision as of 21:23, 12 December 2009

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 remaing 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

http://encyclopedia2.thefreedictionary.com/arm