How many bones make up the skeleton of arm?

There are a total of 30 bones that make up the human arm, which includes the shoulder, upper arm, forearm, and wrist. Here's a breakdown of the bones in each region:

1. Shoulder:

- Clavicle (collarbone): 1 bone on each side

- Scapula (shoulder blade): 2 bones, one on each side

2. Upper arm (humerus):

- Humerus: 1 bone in each arm

3. Forearm:

- Ulna: 1 bone in each arm

- Radius: 1 bone in each arm

4. Wrist (carpal bones):

- 8 carpal bones in each wrist, arranged in two rows:

- Proximal row: Scaphoid, Lunate, Triquetrum, Pisiform

- Distal row: Trapezium, Trapezoid, Capitate, Hamate

5. Hand:

- Metacarpal bones: 5 bones in each hand, numbered 1-5 from the thumb side

- Phalanges (finger bones): 14 bones in each hand, 3 in each finger and 2 in the thumb

In summary, there are 30 bones that make up the skeleton of each arm, including the shoulder, upper arm, forearm, wrist, and hand.