Post-mortem hyperspectral fluorescence imaging with skin removed. (a) Diagram of murine lymph nodes in the neck showing locations for the submandibular (SM; blue), superficial parotid (SP; green), and deep cervical (DC; yellow) lymph nodes. (b) Ventral view of the upper body and head showing intense QD signal (red) in left and right submandibular region 6 h after QD injection into CSF. (c) Right latero-ventral view of the head and neck of a control mouse showing weak QD signal (red) in the right superficial parotid lymph node 6 h after QD application onto the dura mater overlying the cisterna magna. Tissue autofluorescence is shown in green. Scale = 1 cm.