A 12-year-old boy presents with a 5-day history of sore throat. His temperature is 38.7degC (103degF). Physical examination reveals inflamed tonsils and swollen cervical lymph nodes. Trafficking and recirculation of blood-borne lymphocytes through the cervical lymph nodes in this patient occurs primarily at which of the following locations?
Afferent lymphatic vessel Efferent lymphatic vessel Hassall corpuscles High endothelial venules