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Flashcards in Back muscles attachments Deck (48)
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1
Q
What are the muscles of the back divided into? (2)
A
1. superficial (extrinsic)
2. deep (intrinsic)
2
Q
What are the extrinsic muscles of the back innervated by?
A
ventral rami of spinal nerves

accessory nerve
3
Q
What are the extrinsic muscles divided into?
A
superficial and intermediate groups
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
5
Q
What is the origin of rhomboid major?
A
spinous process of TIII to TV
6
Q
What is the insertion of rhomboid major?
A
medial border of scapula between spine and inferior angle
7
Q
What is the innervation of rhomboid major?
A
dorsal scapular nerve
8
Q
What is the function of rhomboid major?
A
1. retracts (adducts)

2. elevates scapula

9
Q
What is the origin of rhomboid minor?
A
1. the lower portion of ligamentum nuchae
2. spinous processes of CVII and TI
10
Q
What is the insertion of rhomboid minor?
A
medial border of scapula at spine of scapula
11
Q
What is the innervation of rhomboid minor?
A
dorsal scapular nerve (C4,C5)
12
Q
What is the function of rhomboid minor?
A
1. retracts (adducts)
2. elevates scapula
13
Q
What is the origin of levator scapulae?
A
transverse processes of CI to CIV
14
Q
What is the insertion of levator scapulae?
A
upper portion of medial border of scapula
15
Q
What is the innervation of levator scapulae?
A
1. C3 to C4

2. dorsal scapular nerve
16
Q
What is the function of levator scapulae?
A
elevates scapula
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
18
Q
What is the innervation to trapezius?
A
motor

1. accessory nerve

proprioception

1. C3 and C4
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
20
Q
What is the origin of latissimus dorsi?
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?
A
floor of inter tubercular sulcus of humerus
22
Q
What is the innervation to latissimus dorsi?
A
thoracodorsal nerve (C6 to C8)
23
Q
What is the function of latissimus dorsi?
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?
A
1. serratus posterior superior
2. serratus posterior inferior

weak accessory muscles for respiration
25
Q
What is the origin of serratus posterior superior?
A
1. lower portion of ligamentum nuchae

2. spinous processes of CVII to TIII

3. supraspinous ligaments
26
Q
What is the insertion of serratus posterior superior?
A
1. upper border of ribs II to V

- just lateral to their angles
27
Q
What is the innervation to serratus posterior superior?
A
anterior rami of upper thoracic nerves (T2 and T5)
28
Q
What is the function of serratus posterior superior?
A
elevates ribs II to V
29
Q
What is the origin of serratus posterior inferior?
A
1. spinous processes of TXI to LIII
2. supraspinous ligaments
30
Q
What is the insertion of superior posterior inferior?
A
1. lower border of ribs IX to XII

- just lateral to their angles
31
Q
What is the innervation of superior posterior inferior?
A
anterior rami of lower thoracic nerves (T9 - T12)
32
Q
What is the function of superior posterior inferior?
A
1. depresses ribs IX and XII
2. prevent lower ribs from being elevated when diaphragm contracts
33
Q
What are in intrinsic or deep/ intrinsic muscles of the back innervated by?
A
posterior rami of spinal nerves
34
Q
What 3 groups can the deep/intrinsic muscles of the back be divided into?
A
1. superficial
2. intermedial
3. deep
35
Q
What muscles are in the superficial group of the deep/intrinsic muscles of the back?
A
1. splenius capitus
2. splenius cervicus
36
Q
What is the origin of splenius capitus?
A
1. lower half of ligamentum nuchae
2. spinous processes of CVII to TIV
37
Q
What is the insertion of splenius capitus?
A
1. mastoid process
2. skull below lateral 1/3 of superior nuchal line
38
Q
What is the innervation of splenius capitus?
A
posterior rami of middle cervical nerves
39
Q
What is the function of splenius capitus?
A
together

1. draw head backwards
2. extends neck

individually

1. draw and rotate head to one side - turn face to same side
40
Q
What is the origin of splenius cervicis?
A
spinous processes of TIII to TVI
41
Q
What is the insertion of splenius cervicis?
A
transverse processes of CI to CIII
42
Q
What is the innervation of splenius cervicis?
A
posterior rami of lower cervical nerves
43
Q
What is the function of splenius cervicis?
A
together

1. extend the neck

Individually

1. draw and rotate head to one side - face turned to the same side
44
Q
What is the intermediate group of muscles of the intrinsic to deep muscles of the back?
A
large erector spinae muscles - lie either side of the vertebral column
45
Q
What is the main function erector spinae?
A
chief extensor vertebral column
46
Q
What 3 muscles does the erector spinae muscle consist of from medial to lateral?
A
1. spinalis
2. longissimus
3. iliocostalis
47
Q
NOTE
A
DO NOT NEED TO KNOW THE ATTACHMENTS OF ERECTOR SPINAE MUSCLES
48
Q
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?
A
1. semispinalis
2. multifidis
3. rotares

origin - transverse processes of the vertebrae

insert - spinous process of more superior vertebrae

know as - transversospinalis group