insect-structure-02 - contracts it flexes the limb at the...

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Insect structure and function 2 Walking At each joint, the cuticle is flexible and allows movement Each joint hinges in only one direction but in the 4 joints the direction is different, so the end of the limb can move in any direction The hard cuticle of an insect forms an exoskeleton which supports the body and maintains its shape. The muscles are attached to the inside of the skeleton. There are often internal projections which contribute to a firm attachment jointed to the body peg peg and socket hinge joint. when this muscle contracts it straightens the limb at the joint when this muscle
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Unformatted text preview: contracts it flexes the limb at the joint exoskeleton of limb joint internal projection socket Diagram of a limb joint Notice that the peg and socket hinge joints are at a different angle in each joint. Walking pattern of a beetle. The three shaded limbs move forward more or less at the same time while the other three remain in contact with the ground. As a result the insect swings rapidly from side to side as it walks. (After Lengerken) © D.G. Mackean The jointed leg the last tarsal segment often carries organs sensitive to chemicals (taste sense) tarsus femur tibia...
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