Final accessory muscles of the vertebral column

Question 1

Interspinalis is paired in which regions of the spine?

Answer 1

cervical and lumbar regions

Question 2

At what locations will interspinalis be absent along the spine?

Answer 2

T3-4 down to T10-11

Question 3

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

Answer 3

weak approximation of the spinous processes or extension of the spine

Question 4

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

Answer 4

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

Question 5

intertansversarii are paired in which region(s) of the spine?

Answer 5

cervical and lumbar regions

Question 6

In which region of the spine are intertransversarii best developed?

Answer 6

cervical region

Question 7

Which of the cervical intertransversarii is innervated by dorsal rami of cervical spinal nerves?

Answer 7

posterior medial belly, cervical intertransversarii

Question 8

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

Answer 8

medial belly, anterior lateral belly, posterior lateral belly

Question 9

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

Answer 9

accessory process of transverse process L1-L4

mammillary process of superior articular process L1-L4

Question 10

Which of the lumbar intertransversarii is innervated by dorsal rami of lumbar spinal nerves?

Answer 10

medial belly, lumbar intertransversarii

Question 11

Which of the lumbar intertransversarii is innervated by ventral rami of lumbar spinal nerves?

Answer 11

anterior lateral belly and posterior lateral belly, lumbar intertransversarii

Question 12

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

Answer 12

intertransversarii

Question 13

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

Answer 13

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