Schematic illustrating extinction sight lines in two contexts. Top panel represents background star extinction studies through diffuse and dense regions of a molecular cloud. Bottom panel (adapted from Fig. 5 of van Dishoeck et al. 2011) shows a forming star embedded in an infalling envelope, with bipolar line-emitting jets carving outflow cavities. The JWST NIRSpec/MIRI field of view probes <1000 AU scales, with the dashed line tracing the line-of-sight path through the dense envelope, where most extinction occurs, toward the inner line emitting jet.