hinge joints, one articulating surface is convex, and the other is concave. On a
ID: 3506302 • Letter: H
Question
hinge joints, one articulating surface is convex, and the other is concave. On a skeleton, identify the elbow joint. Observe the articulating surfaces on disarticulated bones Notice that the capitulum Flexion and extension are the two principal move- ments at hinge joints. Flex and edend your forearm and notice that these movements occur along a single plane or axds Because movement is restricted to one plane, hinge joints re a type of and brochlea on the humerus are convex, and Between the capitulum on the hurmerus and the radial head on the radius the radial head on the radiun and trochiear notch Between the trochlea on the humerus and the trochlear notch on the egions Radius MAKING CONNECTIONS On a skeleton, identify the following hinge joints Interphalangeal joints Knee joints Ankle joints Describe the following actions and identify the joint at which they occur. a Flexion of the leg Move these joints on your body. Based on the movements that you were able to perform, are all these joints uniaxial? Explain b. Inversion of the foot: c Extension of the arm 9 Articulations 139Explanation / Answer
Ans 4)
Interpharangeal joints knee joints and ankle joints are uniaxial as they are a type of hinge joint that allow only for bending and straightening of joints.
Explanations to type of movements
1. Flexion of leg
It is the to and frow movement of the leg that decreses the angle between the two. Flexion of leg takes place by knee joint which is a type of hinge joint.
2. Inversion of the foot
The tilting of the foot away and towards the midline of the body refers to the inversion of foot. It takes place with the help of intertarsal joints which is a type of plane joint.
3. Extension of Arm
Refers to the straightening of the arm awaya from the body. It occurs due to the elbow joint which is a type of hinge joint.
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