As per ‘rule of nine’ each lower limb is
**Question:** As per 'rule of nine' each lower limb is
A. 3 segments
B. 4 segments
C. 2 segments
D. 5 segments
**Correct Answer:** A. 3 segments
**Core Concept:** The "Rule of Nine" is a method used to estimate the severity of peripheral nerve injuries involving the upper or lower limb. It is based on the assumption that each segment of the limb contributes to a specific set of movements or sensations, and a loss of function in any of these segments indicates a nerve injury.
**Why the Correct Answer is Right:** In the context of the lower limb, the "Rule of Nine" applies to the assessment of motor function and sensory function. The rule states that each segment contributes to a specific set of movements or sensations, and a loss of function in any of these segments indicates a nerve injury.
For motor function assessment:
- Segment 1: Distal flexors (ankle flexors, foot dorsiflexors, and toes flexors)
- Segment 2: Proximal flexors (knee flexors and hip flexors)
- Segment 3: Extensors (ankle extensors, foot plantarflexors, and toes extensors)
For sensory function assessment:
- Segment 1: Plantar surface of foot
- Segment 2: Dorsum of foot and dorsal aspects of toes
- Segment 3: Dorsum of foot and ventral aspects of toes
- Segment 4: Ventral surface of foot and dorsum of the toes
- Segment 5: Medial aspect of the foot and plantar aspects of toes
- Segment 6: Lateral aspect of the foot and plantar aspects of toes
- Segment 7: Lateral aspect of the foot and dorsal aspects of toes
- Segment 8: Ankle joint
- Segment 9: Knee joint
**Why Each Wrong Answer is Incorrect:**
**Option B:** 4 segments is incorrect because it only considers motor function assessment. The rule of nine considers motor and sensory function assessment together.
**Option C:** 2 segments is incorrect as it simplifies the assessment of motor function (3 segments) and sensory function (9 segments). The rule of nine accounts for both motor and sensory function assessment.
**Option D:** 5 segments is incorrect as it only considers sensory function assessment (9 segments). The rule of nine considers motor function assessment (3 segments) as well.
**Option E:** 7 segments is incorrect because it only considers sensory function assessment (9 segments). The rule of nine considers motor function assessment (3 segments) as well.
**Option F:** 8 segments is incorrect as it only considers sensory function assessment (9 segments). The rule of nine considers motor function assessment (3 segments) as well.
**Option G:** 9 segments is incorrect because it considers both motor (3 segments) and sensory function (9 segments), but overestimates the total number of segments assessed. The rule of nine considers motor function assessment (3 segments) and sensory function assessment (9 segments), resulting in a