Starfish Model
Asterias.
Includes a numbered key.
Size, 53 x 35 x 31 cm.
Three-part model showing the detailed internal and external anatomy of the starfish.
On this model, 3 of the 5 arms are shown in longitudinal section, each in varying stages of dissection: 1 showing normal organ positioning; 1 with pyloric caeca and gonads removed to show ampullae, Polian vesicles, and the ring canal; and 1 completely dissected to reveal the nervous system (nerve ring and radial nerve).