In the DIRECT pathway, some neurons that have cell bodies in…

In the DIRECT pathway, some neurons that have cell bodies in the motor cortex send their axons out to synapse onto neurons whose cell bodies and dendrites are in the striatum. These cortical neurons release glutamate onto the striatal neurons. This glutamate release [1] the neurons in the striatum. Ultimately the thalamus is [2]. Thus, in the direct pathway, the release of glutamate from neurons in the motor cortex [3] movement.

Consider the image to the right: Below are summaries of thr…

Consider the image to the right: Below are summaries of three recent research papers that have studied neurons in the labeled structures. Based on your knowledge of brain structures, match the research with the most likely relevant brain structure in the image above. Sniffing is a motivated behavior displayed by nearly all terrestrial vertebrates. While sniffing is associated with acquiring and processing odors, sniffing is also intertwined with emotional (affective) and motivated behavior. A 2025 study reported sniffing involves neurons in this structure. [BC]   In 2022, researchers reported that a subset of neurons in this structure express FoxP2. Activating these neurons made male mice more likely to attack another male mouse when it was introduced into their cages. [D]   The intricate organization of circuits that store memory traces remains poorly understood. To address this knowledge gap, researchers used three-dimensional electron microscopy of neurons in this structure to uncover the structural correlates associative memory. They published their results in March of 2025. [A]