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MSK Exam I > Layer 5 Back Muscles > Flashcards

Layer 5 Back Muscles Flashcards

1
Q

Which muscle groups are in the 5th layer of the back?

A

Iliocostalis, longissimus and spinalis groups

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2
Q

Which muscles are within the iliocostalis (lateral) group?

A

Iliocostalis lumborum, thoracis and cervicis

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3
Q

What is the origin of iliocostalis lumborum?

A

Posteromedial iliac crest, spinous processes T11-L5, median sacral crest, lateral sacral crest, sacrotuberous L and long posterior sacroiliac L

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4
Q

What is the insertion for the iliocostalis lumborum muscle?

A

Costal angles of ribs 6-12

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5
Q

What is the origin for iliocostalis thoracis muscle?

A

Costal angles of ribs 6-12

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6
Q

What is the insertion for iliocostalis thoracis?

A

Costal angles of ribs 1-6 and transverse process C7

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7
Q

What is the origin of iliocostalis cervicis?

A

Costal angles of ribs 3-6

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8
Q

What is the insertion for Iliocostalis cervicis?

A

Posterior tubercle of transverse processes C4-6

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9
Q

What is the general action for layer 5 muscles?

A

Maintain erect posture and extend the vertebral column when working unilaterally
Laterally flex the vertebral column when working unilaterally

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10
Q

What is the innervation for layer 5 muscles?

A

Segmentally innervated by posterior rami of spinal nerves

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11
Q

Which muscles are in the longissimus (intermediate) group?

A

Longissimus thoracis, cervicis and capitis

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12
Q

What is the origin of Longissimus thoracis?

A

Common origin with Iliocostalis lumborum, transverse and accessory processes L1-5

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13
Q

What is the insertion site for longissimus thoracis?

A

TP T1-L2, ribs 3-12 between the costal tubercle and costal angle

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14
Q

What is the origin site of longissimus cervicis?

A

TP T1-5

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15
Q

What is the insertion of longissimus cervicis?

A

Posterior tubercles of TP and articular processes of C2-6

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16
Q

What is the origin of longissimus capitis?

A

TP T1-5, articular processes C4-7

17
Q

What is the insertion of longissimus capitis?

A

Mastoid process of the temporal bone

18
Q

What is the action of the longissimus capitis muscle?

A

Extend the neck working bilaterally, laterally flex the neck and rotate face toward working unilaterally

19
Q

Which muscles are in the spinalis (medial) group?

A

Spinalis thoracis, cervicis, and capitis

20
Q

What is the origin of spinalis thoracis?

A

Spinous processes T11-L2

21
Q

What is the insertion site for spinalis thoracis?

A

spinous processes T1-4

22
Q

What is the origin of spinalis cervicis?

A

Spinous processes T1-6

23
Q

What is the insertion of spinal cervicis?

A

Spinous process C2

24
Q

Why is the spinalis capitis muscle unique?

A

Usually absent or blended with semispinalis capitis

MSK Exam I (34 decks)

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