Term
| Why is the Sternocleiomastoid named so? |
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Definition
For it's attachments.
The SCM attaches on the Sternum, the Clavicle, and the Mastoid Process of the Temporal Bone |
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Term
SCM - Sternocleiomastoid TG p244
Origin (Inferior - Axial Skelton Rule - Origin is Inferior)
Inserior (Superior - Axial Skeleton Rule - Insertion is Superior)
** Insertion moves toward Origin
Action |
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Definition
ORIGIN - Inferior = 2 heads
Sternal Head = Manubrum of the Sternum
Clavicular Head = Medial 1/3 of Clavicle
INSERTION - Superior = 2 Points
Mastoid process of Temporal Bone
Lateral 1/3rd - Nuchal Line of Occipital Bone
ACTION - 3 Actions = 1. Bilaterally; 2. Unilaterally; 3. Ipsilateral
1. Bilateral = Flexion of the Neck
2. Unilateral = Contralateral Rotation Neck
3. Ipsilateral = Lateral Flexion of the Neck |
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Term
| True or Flase: In Contralateral Rotation of the Neck, the Insertion moves toward the Origin. |
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Definition
True:
The Insertion of SCM is Superior - Mastoid Process of Temporal Bone and Nuchal Line of Occiput (lateral 1/3rd)
It moves toward the Origin (Inferior) which is the
Manubrum of Sternum and Medial 1/3rd of Clavicle. |
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Term
| In Contralateral Rotation of the Neck by the Action of the SCM, does the rotation occurr to the same side of the muscle or to the opposite side of the muscle that is contracting? |
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Definition
| In contralateral rotation, the neck moves to the OPPOSITE side of the muscle that is acting. |
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Term
| In Ipsilateral Rotation,does the neck rotate to the same side or to the oppostie side of the muscle acting? |
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Definition
| In Ipsilateral rotation (lateral flexion) the nexk moves to the same side as the muscle that is acting. |
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Term
| What is the Unilateral action of the SCM? |
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Definition
| Contralateral Rotation of the Neck. |
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Term
| What is the Ipsilateral action of the SCM? |
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Definition
| Lateral flexion of the Neck. |
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Term
| What are the 2 Origins/Heads of the SCM? |
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Definition
The Sternal Head
The Clavicular Head |
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Term
| Describe the location of the Sternal Head, one of the Origins of the SCM: |
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Definition
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Term
| Describe the location of the Clavicular Head, on eof the Origins of the SCM: |
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Definition
| Medial 1/3rd of the Clavicle. |
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Term
| Describe the location of the 2 Insertion sites of SCM: |
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Definition
Mastoid process of the Temporal Bone
Nuchal Line of the Occipital Bone |
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Term
| What is the Bilateral Action of the SCM? |
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Definition
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Term
| True or False: When both attachemnts are on the Axial Skeleton, the Origin (the fixed attachment) is Inferior. |
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Definition
True.
The Insertion moves toward the origin.
When one attachment is on the axial and the other is on the appendicular, the origin is superior.
When both are on the axial, the origin is distal. |
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