Accessory Muscles of the Vertebral Column Flashcards Preview

Spinal Anatomy I - Exam 3 > Accessory Muscles of the Vertebral Column > Flashcards

Flashcards in Accessory Muscles of the Vertebral Column Deck (29):
1

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

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

2

Interspinalis is paired in which regions of the spine?

cervical and lumbar regions

3

At what locations will interspinalis be absent along the spine?

T3-T4 down to T10-T11

4

What are the attachment sites for the interspinalis muscle?

spinous tubercle and spinous process of adjacent vertebrae

5

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

weak approximation of the spinous processes or extension of the spine

6

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

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

7

Intertransversarii are paired in which regions of the spine?

cervical and lumbar regions

8

In which region of the spine are intertransversarii best developed?

cervical region

9

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

- anterior belly
- posterior lateral belly
- posterior medial belly

10

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

- posterior tubercle of transverse process C1-C2
- anterior tubercle of transverse process C3-C7

11

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

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

12

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

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

13

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

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

14

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

medial aspect of the true transverse process of C1-C7

15

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

- medial aspect of the true transverse process C2-C7
- medial aspect of the true transverse process T1

16

Intertransversarii are unpaired in what region of the spine?

thoracic region

17

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

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

18

What are the attachment sites for the thoracic intertransversarii?

- transverse tubercle of lower thoracics only
- transverse tubercle of adjacent vertebra

19

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

- medial belly
- anterior lateral belly
- posterior lateral belly

20

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

- accessory process of transverse process L1-L4
- mammillary process of superior articular process L1-L4

21

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

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

22

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

transverse tubercle and transverse process of L1-L5

23

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

transverse tubercle and transverse process of the adjacent segment

24

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

accessory process of the transverse process of L1-L4

25

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

transverse process of the segment below (L2-L5)

26

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

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

27

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

intertransversarii

28

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

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

29

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

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

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