'Eeeeek!  By definition, this muscle of the back of the arm has 3 heads'
the triceps
HEY, MUSCLES!: Eeeeek!  By definition, this muscle of the back of the arm has 3 heads
Eeeeek!  By definition, this muscle of the back of the arm has 3 heads
Eeeeek!  By definition, this muscle of the back of the arm has 3 heads
HEY, MUSCLES!
the triceps
HEY, MUSCLES!