Based on the popular children's book by Dr. Seuss, Horton Hears a Who! tells the thoughtful story of Horton, an elephant who is faithful one hundred percent.. Horton's story has delighted children for over 50 years, and now the loyal elephant stars in his own beautifully animated movie.
1 Activate Your Free Trial!  Gastrocnemius muscle. Gastrocnemius muscle, also called leg triceps, large posterior muscle of the calf of the leg. It originates at the back of the femur (thighbone) and patella (kneecap) and, joining the soleus (another muscle of the calf), is attached to the Achilles tendon at the heel.
Definition of GASTROCNEMIUS. : the largest and most superficial muscle of the calf of the leg arising by two heads from the condyles of the femur and attaching to a tendon that becomes part of the Achilles tendon. See gastrocnemius defined for kids.ADVERTISEMENT.efinition of GASTROCNEMIUS. : the largest and most superficial muscle of the calf of the leg arising by two heads from the condyles of the femur and attaching to a tendon that becomes part of the Achilles tendon. See gastrocnemius defined for kids.