Back and Spine Muscles: Action

Question 1

TRUE OR FALSE: Both the Intertransversarii and Interspinales muscle extend trunk and neck.

Answer 1

False.

Only the Interspinales performs this action.

Question 2

Determine the action of the following muscles. You may choose 2-3 answers for each number.

1. extends and laterally bends the trunk and neck
2. extends the trunk and laterally bends the trunk, rotates the trunk to the opposite side
3. extends and laterally bends the trunk, neck and head

A. Spinalis
B. Semispinalis
C. Splenius capitis
D. Iliocostalis
E. Longissimus

Answer 2

1. A and D
2. B
3. E

Question 3

This muscle pulls down lower ribs.

Answer 3

Serratus Posterior Inferior

Question 4

The multifidus acts to (1)____ and (2)____ trunk and neck,
rotate to (3)____ side

Answer 4

1. extend
2. laterally bend
3. opposite

Question 5

TRUE OR FALSE: Erector Spinae acts to perform extension and laterally bending of the trunk, neck and
head.

Answer 5

True.

Question 6

Determine the action of the Splenius cervicis.

A. extends the head, rotate to same side
B. extends the head
C. extends the trunk and laterally bends the trunk, rotates the trunk to the opposite side
D. extends and laterally bends trunk and neck
E. extends and laterally bends the neck and head, rotates head to the same side

Answer 6

E. extends and laterally bends the neck and
head, rotates head to the same side

Question 7

Determine the action of the Splenius capitis.

A. extends the head, rotate to same side
B. extends the head
C. extends the trunk and laterally bends the trunk, rotates the trunk to the opposite side
D. extends and laterally bends trunk and neck
E. Laterally bends the neck and head, rotates head to the same side

Answer 7

E. Laterally bends the neck and
head, rotates head to the same side

Question 8

Determine the action of the Spinalis.

A. extends the head, rotate to same side
B. extends the head
C. extends the trunk and laterally bends the trunk, rotates the trunk to the opposite side
D. extends and laterally bends trunk and neck
E. extends and laterally bends the neck andhead, rotates head to the same side

Answer 8

D. extends and laterally bends trunk and neck

Question 9

Determine the action of the Rectus capitis posterior minor.

A. extends the head, rotate to same side
B. extends the head
C. extends the trunk and laterally bends the trunk, rotates the trunk to the opposite side
D. extends and laterally bends trunk and neck
E. extends and laterally bends the neck and head, rotates head to the same side

Answer 9

B. extends the head

Question 10

What is the action of the Obliquus capitis inferior

Answer 10

rotates the head to the same side

Question 11

Obliquus capitis superior (1)_____ the head, (2)____ the head to the (3)____ side

Answer 11

1. extends
2. rotates
3. same

Question 12

TRUE OR FALSE: Like the Rectus capitis posterior minor, the Rectus capitis posterior major only acts to extend the head.

Answer 12

False.

It extends the head and rotate it to the same side.

Question 13

This muscle rotates the vertebral column to the opposite side

Answer 13

Rotatores

Question 14

This muscle elevates the upper ribs

Answer 14

Serratus Posterior Superior