Head louse penis (Pediculus humanus) Science Image

Ref: 80012793



Colured scanning electron micrograph (SEM) of a head louse penis (Pediculus humanus). The penis is normally hidden within the abdomen, but enlarges and protrudes during mating. The structure consists of a bulbous vesicle (partially visible in image) with pointed thin extensions known as the aedeagus (centre). During sexual reproduction, sperm is transported along the aedeagus. Head lice live in the hair of humans. Each female can lay up to 100 eggs (nits), which are glued to the bottom of hair shafts. An infestation of lice can cause itching due to allergic reaction to louse saliva. Magnification: x280 at 10cm wide.