**Core Concept**
The globus pallidus and putamen are part of the basal ganglia, a group of structures in the brain involved in movement control and cognition. The basal ganglia play a crucial role in the regulation of voluntary motor movements, procedural learning, routine behaviors or "habits" such as teeth grinding, eye movements, cognition, and emotion.

**Why the Correct Answer is Right**
The globus pallidus and putamen are located within the lentiform nucleus in the basal ganglia. They are both components of the striatum, which receives input from the cerebral cortex and sends output to the globus pallidus and substantia nigra. The globus pallidus, in turn, projects to the thalamus and brainstem, while the putamen is involved in the regulation of motor movements through its connections with the globus pallidus and substantia nigra.

**Why Each Wrong Option is Incorrect**
**Option A:** The substantia nigra is a component of the basal ganglia but is not the correct location for the globus pallidus and putamen.
**Option B:** The thalamus is involved in the basal ganglia circuit but does not contain the globus pallidus and putamen.
**Option C:** The amygdala is a component of the limbic system, not the basal ganglia.

**Clinical Pearl / High-Yield Fact**
The basal ganglia are implicated in various neurodegenerative disorders, including Huntington's disease, Parkinson's disease, and dystonia. Understanding the anatomy and function of the basal ganglia is essential for diagnosing and managing these conditions.

**Correct Answer: D. The lentiform nucleus in the basal ganglia.**