Final answer:
The muscle group on the dorsal part of the lower leg is larger than the muscle group on the ventral side because they have different functions. The dorsal muscles are responsible for dorsiflexion, while the ventral muscles are responsible for plantar flexion.
Step-by-step explanation:
The muscle group on the dorsal (back) part of the lower leg is larger than the muscle group on the ventral (front) side because of their different functions.
The muscles on the dorsal part of the lower leg are responsible for dorsiflexion, which is the movement that lifts the front of the foot up towards the shin. These muscles, such as the tibialis anterior and the extensor digitorum longus, need to be strong and powerful to perform this action.
On the other hand, the muscles on the ventral part of the lower leg are responsible for plantar flexion, which is the movement that points the toes downwards. These muscles, such as the gastrocnemius and soleus, do not need to be as strong as the dorsal muscles because they primarily act to maintain posture and support the body weight.