1.2: Adult lamprey Last updated Oct 19, 2021 Save as PDF 1.1: Larval lamprey 2: Skeletal systems Page ID55371 ( \newcommand{\kernel}{\mathrm{null}\,}\) External anatomy of head and pharynx of adult lamprey. CC-BY Skylar Jackson. Transverse sections of the head (a), pharynx (b), and trunk (c) regions of the lamprey. CC-BY Skylar Jackson. Midsagittal section of lamprey. CC-BY Skylar Jackson.