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Anatomy term 2 > Back muscles attachments > Flashcards

Back muscles attachments Flashcards

(48 cards)

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1
Q

What are the muscles of the back divided into? (2)

A
  1. superficial (extrinsic)

2. deep (intrinsic)

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2
Q

What are the extrinsic muscles of the back innervated by?

A

ventral rami of spinal nerves

accessory nerve

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3
Q

What are the extrinsic muscles divided into?

A

superficial and intermediate groups

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4
Q

What are the muscles in the superficial group of extrinsic back muscles?

A
  1. rhomboid major and minor
  2. levator scapulae
  3. trapezius
  4. latissimus dorsi
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5
Q

What is the origin of rhomboid major?

A

spinous process of TIII to TV

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6
Q

What is the insertion of rhomboid major?

A

medial border of scapula between spine and inferior angle

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7
Q

What is the innervation of rhomboid major?

A

dorsal scapular nerve

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8
Q

What is the function of rhomboid major?

A
  1. retracts (adducts)

2. elevates scapula

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9
Q

What is the origin of rhomboid minor?

A
  1. the lower portion of ligamentum nuchae

2. spinous processes of CVII and TI

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10
Q

What is the insertion of rhomboid minor?

A

medial border of scapula at spine of scapula

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11
Q

What is the innervation of rhomboid minor?

A

dorsal scapular nerve (C4,C5)

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12
Q

What is the function of rhomboid minor?

A
  1. retracts (adducts)

2. elevates scapula

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13
Q

What is the origin of levator scapulae?

A

transverse processes of CI to CIV

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14
Q

What is the insertion of levator scapulae?

A

upper portion of medial border of scapula

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15
Q

What is the innervation of levator scapulae?

A
  1. C3 to C4

2. dorsal scapular nerve

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16
Q

What is the function of levator scapulae?

A

elevates scapula

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17
Q

What is the origin of trapezius?

A
  1. superior nuchal line
  2. external occipital protuberance
  3. ligamentum nuchae
  4. spinous processes of CVII to TXII
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18
Q

What is the innervation to trapezius?

A

motor

  1. accessory nerve

proprioception

  1. C3 and C4
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19
Q

What is the function of trapezius?

A
  1. assists in rotating the scapula during abduction of the humerus above horizontal
  2. upper fibres - elevate
  3. middle fibres - adducts
  4. lower fibres - depress scapula
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20
Q

What is the origin of latissimus dorsi?

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A
  1. spinous processes of TVII to LV
  2. spinous processes of sacrum
  3. iliac crest
  4. ribs X to XII
21
Q

What is the insertion of latissimus dorsi?

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A

floor of inter tubercular sulcus of humerus

22
Q

What is the innervation to latissimus dorsi?

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A

thoracodorsal nerve (C6 to C8)

23
Q

What is the function of latissimus dorsi?

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A
  1. extends the humerus
  2. adducts the humerus
  3. medially rotates the humerus
24
Q

What muscles are in the intermediate group of the extrinsic back muscles and what do these muscles act as?

Study These Flashcards
A
  1. serratus posterior superior
  2. serratus posterior inferior

weak accessory muscles for respiration

25
What is the origin of serratus posterior superior?
1. lower portion of ligamentum nuchae 2. spinous processes of CVII to TIII 3. supraspinous ligaments
26
What is the insertion of serratus posterior superior?
1. upper border of ribs II to V | - just lateral to their angles
27
What is the innervation to serratus posterior superior?
anterior rami of upper thoracic nerves (T2 and T5)
28
What is the function of serratus posterior superior?
elevates ribs II to V
29
What is the origin of serratus posterior inferior?
1. spinous processes of TXI to LIII | 2. supraspinous ligaments
30
What is the insertion of superior posterior inferior?
1. lower border of ribs IX to XII | - just lateral to their angles
31
What is the innervation of superior posterior inferior?
anterior rami of lower thoracic nerves (T9 - T12)
32
What is the function of superior posterior inferior?
1. depresses ribs IX and XII | 2. prevent lower ribs from being elevated when diaphragm contracts
33
What are in intrinsic or deep/ intrinsic muscles of the back innervated by?
posterior rami of spinal nerves
34
What 3 groups can the deep/intrinsic muscles of the back be divided into?
1. superficial 2. intermedial 3. deep
35
What muscles are in the superficial group of the deep/intrinsic muscles of the back?
1. splenius capitus | 2. splenius cervicus
36
What is the origin of splenius capitus?
1. lower half of ligamentum nuchae | 2. spinous processes of CVII to TIV
37
What is the insertion of splenius capitus?
1. mastoid process | 2. skull below lateral 1/3 of superior nuchal line
38
What is the innervation of splenius capitus?
posterior rami of middle cervical nerves
39
What is the function of splenius capitus?
together 1. draw head backwards 2. extends neck individually 1. draw and rotate head to one side - turn face to same side
40
What is the origin of splenius cervicis?
spinous processes of TIII to TVI
41
What is the insertion of splenius cervicis?
transverse processes of CI to CIII
42
What is the innervation of splenius cervicis?
posterior rami of lower cervical nerves
43
What is the function of splenius cervicis?
together 1. extend the neck Individually 1. draw and rotate head to one side - face turned to the same side
44
What is the intermediate group of muscles of the intrinsic to deep muscles of the back?
large erector spinae muscles - lie either side of the vertebral column
45
What is the main function erector spinae?
chief extensor vertebral column
46
What 3 muscles does the erector spinae muscle consist of from medial to lateral?
1. spinalis 2. longissimus 3. iliocostalis
47
NOTE
DO NOT NEED TO KNOW THE ATTACHMENTS OF ERECTOR SPINAE MUSCLES
48
What are the muscles of the deep group of the intrinsic muscles of the back and what is their origin and insertion and what they also known as?
1. semispinalis 2. multifidis 3. rotares origin - transverse processes of the vertebrae insert - spinous process of more superior vertebrae know as - transversospinalis group

Anatomy term 2 (25 decks)

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