A. When eating smaller prey (left example), which muscle(s) can generate the mos

Question

A. When eating smaller prey (left example), which muscle(s) can generate
the most bite force to crush prey? (2 pts)
B. Describe how the moment arm ratio changes between OPEN and CLOSED
jaw positions (i.e. increasing, decreasing, or constant) for the three muscles
when biting on the larger prey with a wider gape. Which muscle generates
the most torque (moment) in the example on the right (the larger prey)? (2
pts)
C. Which muscle(s) are able to close the jaw FASTEST in both the smaller
gape (left) and larger gape (right) examples? (1 pt

Explanation / Answer

Muscle 1, looks like it retracts the mandible. Muscle 2, looks like it's a very strong chewing muscle, so it would exhibit the most force. Muscle 3, looks like it also aids in retracting the jaw, since its attached to the mandibular region. Since the bite force is in the upper direction with the small prey, Muscle 1 would most likely be involved, since retraction of the jaw would have an upward force. Muscle 2, is responsible for the majority of the force in chewing the larger prey. Muscle 1 retracts the jaw quickly on the left (small prey). While, Muscle 3 has the advantage to retract the jaw in the right picture (larger prey). Hope that helps!

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