How many divisons does the brachial plexus have?

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BlackTom AI · Accepted Answer

Question restated: How many divisions does the brachial plexus have?
Options are: a. 5, b. 3, c. 4, d. 7, e. 6

To evaluate, consider the anatomical organization of the brachial plexus into trunks and divisions. Each of the three trunks (upper, middle, lower) gives rise to two divisions: an anterior division and a posterior division. Therefore, from the three trunks, we obtain 3 x 2 = 6 divisions in total.

Option a: 5. This undercounts the divisions; the standard anatomical model accounts for six divisions, not five, due to the anterior and posterior divisions from each of the three trunks.

Option b: 3. This would reflect only the number of trunks, not the divisions within the trunks. The brachial plexus has more than three divisions when considering the split into anterior and posterior branches.

Option c: 4. This is also inconsistent with the canonical count, which factors in divisions from all three trunks, yielding six divisions in total.

Option d: 7. This overstates the count by one; there is no seventh division in the classic description of the brachial plexus divisions.

Option e: 6. This aligns with the accepted anatomical description: three trunks each give rise to an anterior and a posterior division, totaling six divisions.

How many divisons does the brachial plexus have?

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