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The Musculo-Skeletal System and Movement Analysis

Planes, axes and sagittal plane joint actions

  • 3 things to know
  • Paper 1

Overview

The sagittal plane and transverse axis, flexion, extension and hyperextension, plantar flexion and dorsiflexion, applied to kicking, sprinting, a bicep curl, a squat and a somersault.

What you need to know

Answer each one before you reveal it.

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Key term

Describe the sagittal plane, the axis it pairs with, and the joint actions that happen in it.

Key term

Define flexion, extension, hyperextension and plantar flexion.

Key term

What is the sagittal plane?

Questions from this subtopic

Each one with the model answer underneath.

  1. 1

    What is the sagittal plane?

    Model answer

    The sagittal plane is a vertical plane that divides the body into left and right halves.

  2. 2

    Which axis is paired with movement in the sagittal plane?

    Model answer

    Movement in the sagittal plane occurs about the transverse axis. The transverse axis runs horizontally from side to side through the body.

  3. 3

    Which joint actions occur in the sagittal plane?

    Model answer

    Flexion, extension and hyperextension occur in the sagittal plane. Plantar flexion and dorsiflexion at the ankle also occur in the sagittal plane.

  4. 4

    Define flexion.

    Model answer

    Flexion is a decrease in the angle between the bones at a joint.

  5. 5

    Define extension and hyperextension.

    Model answer

    Extension is an increase in the angle between the bones at a joint. Hyperextension is an increase beyond 180 degrees, past the straight position.

  6. 6

    What is plantar flexion?

    Model answer

    Plantar flexion is the ankle movement that points the toes away from the shin. Plantar flexion increases the angle at the ankle.

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