Question:medium

How many bones are found in the forelimb?

Show Hint

Both the human upper limb (forelimb) and lower limb (hindlimb) contain exactly 30 bones each, though their structural components differ (e.g., carpals vs tarsals, patella present in the knee).
  • 30
  • 32
  • 34
  • 36
Show Solution

The Correct Option is A

Solution and Explanation

Step 1: Break the free upper limb into its regions.
The forelimb, from the shoulder joint to the fingertips, is made up of four regions: the arm, the forearm, the wrist, and the hand, and every bone in the limb falls into one of these four groups.
Step 2: Count the bones in each region.
The arm has a single long bone, the humerus. The forearm has two parallel bones, the radius and the ulna. The wrist is made up of 8 small carpal bones packed together, the palm has 5 metacarpal bones (one leading into each finger), and the fingers themselves are built from 14 phalanges, three each in the four fingers and two in the thumb.
Step 3: Add the regional counts together.
\[ 1\ (\text{humerus}) + 2\ (\text{radius, ulna}) + 8\ (\text{carpals}) + 5\ (\text{metacarpals}) + 14\ (\text{phalanges}) = 30 \]
This regional count matches the standard total taught for one human forelimb.
\[ \boxed{30} \]
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