Mucles of the spine and Thorax Flashcards

Muscle names, origin, insertions and actions.

1
Q

What is the origin, insertion and action of the muscle Spinalis ?

A

Origin: common tendon (thoracolumbar aponeurosis)
Insertion: spinous process of all vertebrae
Action: bi-laterally: extend vertebral column
uni-laterally: laterally flex vertebral column

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2
Q

What is the meaning of uni-lateral and bi-lateral in terms of muscle actions?

A

uni-lateral: only the muscle on one side of the spine contract. Resulting action is lateral flexion to one side.
bi-lateral: muscles on both sides of spine contract. results in extension of the vertebral column.

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3
Q

What is the origin, insertion and action of the muscle Longissimus?

A

Origin: common tendon (thoracolumbar aponeurosis)
Insertion: transverse processes of all thoracic and cervical, ribs, and mastoid process of temporal bone.
Action: bi-laterally: extend vertebral column
uni-laterally: laterally flex vertebral column

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4
Q

What is the origin, insertion and action of the muscle Illiocostalis?

A

Origin: common tendon (thoracolumbar aponeurosis)
Insertion: ribs 1-12
Action: Bi-laterally: extend vertebral column
uni-laterally: laterally flex vertebral column

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5
Q

The muscles spinalis, longissimus and illiocostalis make up what muscle group?

A

Erector Spinae Group (ESG)

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6
Q

What is the origin, insertion and action of the muscle Rotatories?

A

Origin: transverse processes of all vertebrae
Insertion: spinous processes of all vertebrae
Action: extends back, rotates spine to opposite side

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7
Q

What is the origin, insertion and action of the muscle Semispinalis Capitus?

A

Origin: transverse process of thoracic vertebrae and lower cervicals.
Insertion: spinous processes of upper thoracic, cervicals and nuchal line
Action: extends the spine and head.

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8
Q

What is the origin, insertion and action of the muscle Multifidi?

A

Origin: sacrum and transverse processes of all vertebrae
Insertion: spinous processes of all vertebrae
Action: extends back, rotate spine to opposite side

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9
Q

The muscles Multifidi, Rotatores and Semispinalis capitus make up which muscle group?

A

Transverse spinali group

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10
Q

What is the origin, insertion and action of the muscle Splenius Capitis?

A

Origin: spinous processes of C7 to T4
Insertion: mastoid process and nuchal line
Action: uni-laterally: rotate head to same side
bi-laterally: extend head and neck

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11
Q

What is the origin, insertion and action of the muscle Splenius Cervicis?

A

Origin: spinous processes of T3-T6
Insertion: transverse processes of C1- C3
Action: uni-lateral: rotate head to the same side
bi-lateral: extend the head and neck

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12
Q

What is the general origin, insertion and action of the Suboccipital muscles? (the suboccipitals will not be looked into with detail and will instead be looked at in a group)

A

Location: Spinous process C2, transverse process C1 and inferior nuchal lines.
Action: all rock and tilt the head back into extension.

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13
Q

What is the origin, insertion and action of the muscle Quadratus Lumborum (QL)

A

Origin: prosterior illiac crest
Insertion: last rib, transverse processes of L1-L4
Action: uni-laterally: elevates hip, laterally flexes spine
bi-laterally: assists to extend vertebral column, fixes last rib during respiration.

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14
Q

The muscles Splenius Capitis, Splenius Cervicis, Suboccipitals, and Quadratus Lumborum make up which muscle group?

A

Splenii group

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15
Q

What is the origin, insertion and action of the muscle Rectus Abdominis

A

Origin:
Insertion:
Action:

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