Accessory Muscles of the Vertebral Column

Question 1

At what segmental levels of the spine will the interspinalis muscle be present?

Answer 1

C2-C7, T1-T3, and T11-T12, L1-L4 or L5

Question 2

Interspinalis is paired in which regions of the spine?

Answer 2

cervical and lumbar regions

Question 3

At what locations will interspinalis be absent along the spine?

Answer 3

T3-T4 down to T10-T11

Question 4

What are the attachment sites for the interspinalis muscle?

Answer 4

spinous tubercle and spinous process of adjacent vertebrae

Question 5

Contraction of interspinalis is traditionally said to result in what movement?

Answer 5

weak approximation of the spinous processes or extension of the spine

Question 6

Based on the density of muscle spindles what is the proposed function of the interspinalis?

Answer 6

acts as a proprioceptive transducer in conjunction with intertransversarii to coordinate the smooth movement of the spine and to maintain appropriate posture

Question 7

Intertransversarii are paired in which regions of the spine?

Answer 7

cervical and lumbar regions

Question 8

In which region of the spine are intertransversarii best developed?

Answer 8

cervical region

Question 9

What are the names of the parts of the intertransversarii in the cervical spine?

Answer 9

• anterior belly
• posterior lateral belly
• posterior medial belly

Question 10

What is the origin of the anterior belly of the cervical intertransversarii?

Answer 10

• posterior tubercle of transverse process C1-C2

- anterior tubercle of transverse process C3-C7

Question 11

What is the insertion of the anterior belly of the cervical intertransversarii?

Answer 11

• posterior tubercle of transverse process C2
• anterior tubercle of transverse process C3-C7
• transverse tubercle T1

Question 12

What is the origin of the posterior lateral belly of the cervical intertransversarii?

Answer 12

lateral aspect and posterior tubercle of the true transverse process of C1-C7

Question 13

What is the insertion of the posterior lateral belly of the cervical intertransversarii?

Answer 13

• lateral aspect and posterior tubercle of the true transverse process of C2-C7
• transverse tubercle of T1

Question 14

What is the origin of the posterior medial belly of the cervical intertransversarii?

Answer 14

medial aspect of the true transverse process of C1-C7

Question 15

What is the insertion of the posterior medial belly of the cervical intertransversarii?

Answer 15

• medial aspect of the true transverse process C2-C7

- medial aspect of the true transverse process T1

Question 16

Intertransversarii are unpaired in what region of the spine?

Answer 16

thoracic region

Question 17

What is the innervation of each part of the cervical intertransversarii?

Answer 17

• anterior belly: ventral ramus, cervical spinal nerve
• posterior lateral belly: ventral ramus, cervical spinal nerve
• posterior medial belly: dorsal ramus, cervical spinal nerve

Question 18

What are the attachment sites for the thoracic intertransversarii?

Answer 18

• transverse tubercle of lower thoracics only

- transverse tubercle of adjacent vertebra

Question 19

What are the names of the parts of the intertransversarii in the lumbar spine?

Answer 19

• medial belly
• anterior lateral belly
• posterior lateral belly

Question 20

What is the origin of the medial belly of the lumbar intertransversarii?

Answer 20

• accessory process of transverse process L1-L4

- mammillary process of superior articular process L1-L4

Question 21

What is the insertion of the medial belly of the lumbar intertransversarii?

Answer 21

mammillary process of superior articular process the segment below (L2-L5)

Question 22

What is the origin of the anterior lateral belly of the lumbar intertransversarii?

Answer 22

transverse tubercle and transverse process of L1-L5

Question 23

What is the insertion of the anterior lateral belly of the lumbar intertransversarii?

Answer 23

transverse tubercle and transverse process of the adjacent segment

Question 24

What is the origin of the anterior medial belly of the lumbar intertransversarii?

Answer 24

accessory process of the transverse process of L1-L4

Question 25

What is the insertion of the anterior medial belly of the lumbar intertransversarii?

Answer 25

transverse process of the segment below (L2-L5)

Question 26

What is the innervation of each part of the lumbar intertransversarii?

Answer 26

• medial belly: dorsal ramus, lumbar spinal nerve
• anterior lateral belly: ventral ramus, lumbar spinal nerve
• anterior medial belly: ventral ramus, lumbar spinal nerve

Question 27

Which muscle group is innervated by both dorsal rami and ventral rami of spinal nerves?

Answer 27

intertransversarii

Question 28

Contraction of intertransversarii is traditionally said to result in what movement?

Answer 28

weak approximation of transverse processes or lateral flexion (bending) of the spine

Question 29

Based on the density of muscle spindles what is the proposed function of the intertransversarii?

Answer 29

acts as a proprioceptive transducer in conjunction with interspinalis to coordinate the smooth movement of the spine and to maintain appropriate posture