S3 Accessory Muscles of the Vertebral Column

Question 1

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

Answer 1

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

Question 2

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

Answer 2

posterior medial belly, cervical intertransversarii

Question 3

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

Answer 3

accessory process of transverse process L1-L4

mammillary process of superior articular process L1-L4

Question 4

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

Answer 4

intertransversarii

Question 5

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

Answer 5

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

Question 6

Interspinalis is paired in which regions of the spine?

Answer 6

cervical and lumbar regions