Movie 5.

Spermatozoon with translucent particle stuck on the neck, swimming in non-capacitating viscous medium with absence of head rotation.

Human sperm rotate with a conserved direction during free swimming in four dimensions

Gabriel Corkidi, Fernando Montoya, Ana L. González-Cota, Paul Hernández-Herrera, Neil C. Bruce, Hermes Bloomfield-Gadêlha, and Alberto Darszon

J Cell Sci 2023. 136:None-None; doi: 10.1242/jcs.261306