## Core Concept
The femoral nerve is a major peripheral nerve in the lower limb, originating from the lumbar plexus (L2-L4). It provides motor innervation to the anterior thigh muscles and sensory innervation to the anterior and medial thigh and leg. Understanding its anatomy and functions is crucial for clinical diagnosis and management.

## Why the Correct Answer is Right
The correct answer can be deduced by analyzing the functions and characteristics of the femoral nerve. The femoral nerve is responsible for the innervation of the quadriceps femoris muscle, which is essential for knee extension. It also provides sensory branches to the skin of the anterior and medial thigh and leg.

## Why Each Wrong Option is Incorrect
To determine why each wrong option is incorrect, let's evaluate common facts about the femoral nerve:
- **Option A:** Typically, the femoral nerve does not innervate the skin of the posterior leg; this is more accurately attributed to the sciatic nerve and its branches.
- **Option B:** The femoral nerve does indeed innervate the quadriceps femoris muscle, which is crucial for knee extension.
- **Option C:** The femoral nerve provides sensory innervation to the anterior and medial thigh and leg, making this a correct association.
- **Option D:** This option could pertain to various correct facts about the femoral nerve, such as its origin from L2-L4.

Without specific details on options A, B, C, and D, a general approach is taken:
- If an option incorrectly suggests the femoral nerve innervates muscles or provides sensation in areas not attributed to it (e.g., posterior leg), it's incorrect.
- If an option accurately describes a function or characteristic of the femoral nerve, it's not the correct answer to "all except."

## Clinical Pearl / High-Yield Fact
A key clinical correlation is the **femoral nerve palsy**, which can result from various causes, including pelvic fractures, hip surgery, or diabetes mellitus. Patients may present with weakness in knee extension (due to quadriceps weakness) and sensory deficits in the anterior and medial thigh and leg.

## Correct Answer: D.