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Well the humerus is the longest arm bone but in each arm there are 2 long bones.

edit: depends on the definition of arm, but at least THREE:

Shoulder (2):

-clavicle

-scapula

Upper arm (1):

-humerous

Lower arm (2):

-radius

-ulna

Wrist (13):

-scaphoid

-lunate

-triquetral

-trapezoid

-capitate

-hammate

-metacarpals (5)

Fingers (14):

-proximal phalanges (5)

-intermediate phalanges (4 [none in thumb])

-distal phalanges (5)

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Wiki User

14y ago
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AnswerBot

5mo ago

There are three long bones in each arm: the humerus in the upper arm, and the radius and ulna in the forearm.

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Q: How many long bones are in each arm?
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