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When the chin is against the chest, the neck is flexed, and the trunk is flexed when a person leans forward. [10] Flexion of the shoulder or hip is movement of the arm or leg forward. [11] Extension is the opposite of flexion, a straightening movement that increases the angle between body parts. [12] For example, when standing up, the knees are ...
In anatomy, extension is a movement of a joint that increases the angle between two bones or body surfaces at a joint. Extension usually results in straightening of the bones or body surfaces involved. For example, extension is produced by extending the flexed (bent) elbow. Straightening of the arm would require extension at the elbow joint.
Movements of the neck includes: flexion, extension, (nodding yes), and rotation (shaking head no). The mouth has evolved to support chewing, (mastication) and swallowing (deglutition), and speech (phonation). In addition to the teeth, other structures that aid chewing are the lips, cheeks, tongue, hard palate, soft palate, and floor of the mouth.
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Abnormal posturing is an involuntary flexion or extension of the arms and legs, indicating severe brain injury. It occurs when one set of muscles becomes incapacitated while the opposing set is not, and an external stimulus such as pain causes the working set of muscles to contract. [1] The posturing may also occur without a stimulus.
Torticollis is a fixed or dynamic tilt, rotation, with flexion or extension of the head and/or neck. The type of torticollis can be described depending on the positions of the head and neck. [1] [3] [4] laterocollis: the head is tipped toward the shoulder; rotational torticollis: the head rotates along the longitudinal axis towards the shoulder [5]
Flexion is produced mainly by the action of the longi capitis and recti capitis anteriores; extension by the recti capitis posteriores major and minor, the obliquus capitis superior, the semispinalis capitis, splenius capitis, sternocleidomastoideus, and upper fibers of the trapezius.
The symmetrical tonic neck reflex can be tested by placing the child in quadruped position on the floor and passively flexing the head forward and then extend it backwards. The expected response would be forward head flexion producing flexion of the upper extremities and extension of the lower extremities while extension of the head will ...
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