The lumbar plexus is subdivided into a(n) ______ division and a(n) ______ division.

• A. medial; lateral
• B. anterior; posterior
• C. dorsal; ventral
• D. superior; inferior

Answer: (B)

Verified step by step guidance

1. Step 1: Begin by understanding the lumbar plexus, which is a network of nerves formed by the anterior rami of the spinal nerves L1-L4. It provides motor and sensory innervation to the lower limb and parts of the pelvis.
2. Step 2: Recall that the lumbar plexus is divided into two main divisions based on anatomical orientation: anterior and posterior divisions. These divisions are responsible for innervating different muscle groups and regions.
3. Step 3: Eliminate incorrect options by considering anatomical terminology. For example, 'medial; lateral' and 'superior; inferior' are not standard divisions used to describe the lumbar plexus.
4. Step 4: Understand that 'dorsal; ventral' refers to general anatomical directions but does not specifically describe the divisions of the lumbar plexus. The correct terms are 'anterior; posterior' divisions.
5. Step 5: Conclude that the lumbar plexus is subdivided into an anterior division and a posterior division, which are the correct anatomical terms for its organization.