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ANAT 392 - Meag > Muscle of Back > Flashcards

Muscle of Back Flashcards

1
Q

What 4 things does vertebral column mobility depend on

A
  • Thickness of intervertebral discs
  • orientation of articular surfaces in Z joint
  • Presence of the ribs
  • Tension of the surrounding soft tissues (Joint capsule, muscles, ligaments)
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2
Q

A vertebral segment which has a ______ thickness of disk to height of vertebrae ratio has the most mobility

A

highest

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3
Q

What is the thickness of disk to height of vertebrae ratio in cervical vertebrae

A

2/5

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4
Q

What is the thickness of disk to height of vertebrae ratio in thoracic vertebrae

A

1/5

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5
Q

What is the thickness of disk to height of vertebrae ratio in lumbar vertebrae

A

1/3

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6
Q

Which portion of the spine has the thinest disks? Greatest?

A

cervical

lumbar

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7
Q

The articular surfaces in the cervical region are sitting in what plane?

A

almost horizontal

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8
Q

The articular surfaces in the thoracic region are sitting in what plane?

A

Coronal

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9
Q

The articular surfaces in the lumbar region are sitting in what plane?

A

turning into sagittal

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10
Q

What spinal region has the most flexion

A

lumbar

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11
Q

What spinal region has the most extension

A

cervical

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12
Q

What spinal region has the most lateral flexion

A

cervical

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13
Q

What lumbar region has the most rotation

A

cervical

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14
Q

what is the MAIN origina of lat dorsi

A

thoracolumbar fascia

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15
Q

Is the lat dorsi capable of dislocating the shoulder? why doesnt it?

A

yes but it doesnt because triceps oppose the downward pull with upward pull

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16
Q

Where does lat dorsi insert

A

floor of intertubercular sulcus of humerus

17
Q

lat dorsi is the prime mover of what action

A

extension at GH joint

18
Q

What is the reverse function of lat dorsi

A

Lift trunk

19
Q

In what populations is the reverse function of lat dorsi important

A

people who are paralegiac - used in wheelchair transfers

20
Q

What is the nerve supply and spinal segments of lat dorsi

A

thoracodorsal nerve C6, C7, C8

21
Q

What is the nerve supply for trap

A

accessory nerve

22
Q

O of rhomboid major?

A

Spinous process of T2-T5

23
Q

O of rhomboid minor?

A

Spinous processes of C7-T1

24
Q

What is the nerve supply of the rhomboids

A

Dorsal scapular nerve

C4, C5

25
Q

O, I, Action, and nerve supply of serratus posterior superior

A

O - SP C7-T2, supraspinous ligaments, distal nuchal ligament
I - upper ribs
A - Elevates ribs accesory muscle in inspiration
NS - Ventral rami T2-T5

26
Q

O, I, Action, and nerve supply of serratus posterior inferior

A

O - SP T11-L2 and supraspinous ligament
I - 8th-12th rib
A - depresses ribs - accessory muscle in respiration
NS - Ventral rami T9-T12

27
Q

What is the O, I, A, and NS of splenius capitis

A

O - Spinous processes of C7-T3 vertebrae, nuchal ligament and supraspinous ligament
I - mastoid process
A - extension of head and cervical spine, ipsilateral rotation of head, lateral flexion of neck
NS - Cervical nerves 2 and 3

28
Q

What is the O, I, A, and NS of splenius cervicis

A

O - SP of T3-T6 and supraspinous ligament
I - Transverse process of C1-C2
A - extension and side flexion of neck
NS - Lateral branches of posterior rami of lower cervical nerves

29
Q

Erector spinae is comprised of which 3 logitudinal muscle bundles

A
  1. Ilio-costalis
  2. Longissimus
  3. Spinalis
30
Q

____ muscles occupy the bony gutter between spinous and transverse processes

A

Transverso-spinalis

31
Q

The transverso-spinalis muscle include with muscles

A

Semi-spinalis
Multifidus
Rotatores

32
Q

What are the 3 other less talked about segmental muscular groups

A
  • Interspinales
  • Intertransversarii
  • Levatores costarum
33
Q

Rotation of vertebral column is primarily done by…

A

rotares

34
Q

What is the O, I, A, and NS of levator costarum

A

O - TP of C7-T11
I - Upper margin of rib
A - Elevate ribs
NS - Dorsal rami

35
Q

Which segmental muscle group can sometimes turn into a ligament by becoming fibrotic

A

intertransversarii

36
Q

The occipital triangle is formed by…

A
  1. Obliquus capitis superior
  2. Obliquus capitis inferior
  3. Rectus capitis posterior major
37
Q

What are 3 contents of the sub-occipital triangle

A
  1. Vertebral artery
  2. Greater occipital nerve (C2)
  3. Sub-occipital nerve (C1)
38
Q

How does the sub-occipital triangle relate to headaches

A

The vertebral artery lies right inside i. any muscles could compress the artery if they spasm and cause significant changes in blood pressure inside cranium

ANAT 392 - Meag (18 decks)

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