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Anatomy > Truck Muscles > Flashcards

Truck Muscles Flashcards

1
Q

Origin: Platysma

A

Skin over edge of mandible

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2
Q

Insertion: Platysma

A

Skin over clavicles

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3
Q

Innervation: Platysma

A

Facial nerve (CN VII)

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4
Q

Action: Platysma

A

Tenses skin on neck

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5
Q

Notes: Platysma

A

Superficial layer

Runs from mouth and mandible to 2nd rib

Attaches to fascia and skin

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6
Q

Origin: Orbicularis Oris

A

-

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7
Q

Insertion: Orbicularis Oris

A

-

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8
Q

Innervation: Orbicularis Oris

A

Facial nerve (CN VII)

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9
Q

Action: Orbicularis Oris

A

Purses lips

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10
Q

Notes: Orbicularis Oris

A

Superficial layer

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11
Q

Origin: Orbicularis Oculi

A

-

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12
Q

Insertion: Orbicularis Oculi

A

-

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13
Q

Innervation: Orbicularis Oculi

A

Facial nerve (CN VII)

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14
Q

Action: Orbicularis Oculi

A

Closes eyelid

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15
Q

Notes: Orbicularis Oculi

A

Superficial layer

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16
Q

Origin: Zygomaticus Major and Minor

A

-

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17
Q

Insertion: Zygomaticus Major and Minor

A

-

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18
Q

Innervation: Zygomaticus Major and Minor

A

Facial nerve (CN VII)

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19
Q

Action: Zygomaticus Major and Minor

A

Smiling

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20
Q

Notes: Zygomaticus Major and Minor

A

Superficial layer

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21
Q

Origin: Levator Labii Superioris

A

-

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22
Q

Insertion: Levator Labii Superioris

A

-

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23
Q

Innervation: Levator Labii Superioris

A

Facial nerve (CN VII)

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24
Q

Action: Levator Labii Superioris

A

Elevates upper lip

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25
Q

Notes: Levator Labii Superioris

A

Superficial layer

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26
Q

Origin: Risorius

A

-

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27
Q

Insertion: Risorius

A

-

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28
Q

Innervation: Risorius

A

Facial nerve (CN VII)

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29
Q

Action: Risorius

A

Smiling

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30
Q

Notes: Risorius

A

Superficial layer

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31
Q

Origin: Depressor Anguli Oris

A

-

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32
Q

Insertion: Depressor Anguli Oris

A

-

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33
Q

Innervation: Depressor Anguli Oris

A

Facial nerve (CN VII)

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34
Q

Action: Depressor Anguli Oris

A

Depresses angle of mouth

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35
Q

Notes: Depressor Anguli Oris

A

Superficial layer

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36
Q

Origin: Levator Anguli Oris

A

-

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37
Q

Insertion: Levator Anguli Oris

A

-

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38
Q

Innervation: Levator Anguli Oris

A

Facial nerve (CN VII)

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39
Q

Action: Levator Anguli Oris

A

Lifts angle of mouth

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40
Q

Notes: Levator Anguli Oris

A

Deep layer

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41
Q

Origin: Depressor Labii Inferioris

A

-

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42
Q

Insertion: Depressor Labii Inferioris

A

-

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43
Q

Innervation: Depressor Labii Inferioris

A

Facial nerve (CN VII)

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44
Q

Action: Depressor Labii Inferioris

A

Depresses lower lip

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45
Q

Notes: Depressor Labii Inferioris

A

Deep layer

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46
Q

Origin: Mentalis

A

-

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47
Q

Insertion: Mentalis

A

-

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48
Q

Innervation: Mentalis

A

Facial nerve (CN VII)

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49
Q

Action: Mentalis

A

Wrinkles chin, protrudes lower lip

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50
Q

Notes: Mentalis

A

Deep layer

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51
Q

Origin: Buccinator

A

-

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52
Q

Insertion: Buccinator

A

-

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53
Q

Innervation: Buccinator

A

Facial nerve (CN VII)

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54
Q

Action: Buccinator

A

Sucking, whistling

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55
Q

Notes: Buccinator

A

Deep layer

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56
Q

Origin: Superior, Anterior and Posterior Auricular muscles

A

-

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57
Q

Insertion: Superior, Anterior and Posterior Auricular muscles

A

-

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58
Q

Innervation: Superior, Anterior and Posterior Auricular muscles

A

Facial nerve (CN VII)

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59
Q

Action: Superior, Anterior and Posterior Auricular muscles

A

Wiggle ears

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60
Q

Origin: Frontalis

A

-

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61
Q

Insertion: Frontalis

A

-

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62
Q

Innervation: Frontalis

A

Facial nerve (CN VII)

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63
Q

Action: Frontalis

A
  1. Elevates eyebrows

2. Wrinkles forehead

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64
Q

Origin: Occipitalis

A

-

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65
Q

Insertion: Occipitalis

A

-

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66
Q

Innervation: Occipitalis

A

Facial nerve (CN VII)

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67
Q

Action: Occipitalis

A

Pulls scalp back

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68
Q

Origin: Longus Capitis

A

Transverse processes of mid-cervical vertebrae

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69
Q

Insertion: Longus Capitis

A

Occipital bone

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70
Q

Innervation: Longus Capitis

A

Segmental cervical ventral rami

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71
Q

Action: Longus Capitis

A

Flexes head and neck

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72
Q

Origin: Longus Colli

A
  1. Vertical portion: lower cervical vertebrae
  2. Upper oblique portion: upper cervical bodies
  3. Lower oblique portion: lower cervical bodies
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73
Q

Insertion: Longus Colli

A
  1. Vertical portion: upper cervical vertebrae
  2. Upper oblique portion: mid-cervical transverse processes
  3. Lower oblique portion: mid-cervical transverse processes
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74
Q

Innervation: Longus Colli

A

Segmental ventral rami

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75
Q

Action: Longus Colli

A

Flexes neck

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76
Q

Notes: Longus Colli

A

Fibers of vertical and lower oblique portions run upward

Fibers of upper oblique portion run downward

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77
Q

Origin: Rectus Capitis Anterior

A

Atlas

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78
Q

Insertion: Rectus Capitis Anterior

A

Occipital bone

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79
Q

Innervation: Rectus Capitis Anterior

A

Ventral rami C1, 2

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80
Q

Action: Rectus Capitis Anterior

A

Flexes head

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81
Q

Origin: Rectus Capitis Lateralis

A

Atlas

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82
Q

Insertion: Rectus Capitis Lateralis

A

Occipital bone

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83
Q

Innervation: Rectus Capitis Lateralis

A

Ventral rami C1, 2

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84
Q

Action: Rectus Capitis Lateralis

A

Lateral flexion of head

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85
Q

Origin: Anterior Scalene

A

Transverse process of mid-cervical vertebrae

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86
Q

Insertion: Anterior Scalene

A

1st rib

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87
Q

Innervation: Anterior Scalene

A

Ventral rami of cervical nerves

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88
Q

Action: Anterior Scalene

A
  1. Raises first rib

2. Laterally flexes neck

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89
Q

Origin: Middle Scalene

A

All cervical transverse processes

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90
Q

Insertion: Middle Scalene

A

1st rib

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91
Q

Innervation: Middle Scalene

A

Ventral rami of cervical nerves

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92
Q

Action: Middle Scalene

A
  1. Raises first rib

2. Laterally flexes neck

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93
Q

Origin: Posterior Scalene

A

Transverse processes of mid-cervical vertebrae

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94
Q

Insertion: Posterior Scalene

A

2nd rib

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95
Q

Innervation: Posterior Scalene

A

Ventral rami of cervical nerves

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96
Q

Action: Posterior Scalene

A
  1. Raises second rib

2. Laterally flexes neck

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97
Q

Origin: Sternocleidomastoid

A
  1. Manubrium

2. Medial 1/3 of clavicle

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98
Q

Insertion: Sternocleidomastoid

A

Mastoid process

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99
Q

Innervation: Sternocleidomastoid

A

Accessory nerve (CN XI)

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100
Q

Action: Sternocleidomastoid

A
  1. Flexes neck

2. Rotates head to opposite side

101
Q

Origin: Digastric

A
  1. Posterior belly: mastoid process

2. Anterior belly: inner mandible, just lateral to midline

102
Q

Insertion: Digastric

A

Hyoid bone

103
Q

Innervation: Digastric

A
  1. Posterior belly: facial nerve (CN VII)

2. Anterior belly: trigeminal nerve (CN V3)

104
Q

Action: Digastric

A
  1. Moves hyoid superiorly and posteriorly in swallowing

2. Opens jaw against resistance

105
Q

Origin: Omohyoid

A
  1. Inferior belly: superior margin of scapula

2. Superior belly: hyoid

106
Q

Insertion: Omohyoid

A

Intermediate tendon attaches to posterior clavicle and 1st rib by fascial sling

107
Q

Innervation: Omohyoid

A

Branches of ansa cervicalis

108
Q

Action: Omohyoid

A

Strap muscles as a group, depress larynx, hyoid bone and floor of mouth during swallowing

109
Q

Notes: Omohyoid

A

Strap muscle

110
Q

Origin: Sternohyoid

A

Manubrium

111
Q

Insertion: Sternohyoid

A

Hyoid bone

112
Q

Innervation: Sternohyoid

A

Branches of ansa cervicalis

113
Q

Action: Sternohyoid

A

Strap muscles as a group, depress larynx, hyoid bone and floor of mouth during swallowing

114
Q

Notes: Sternohyoid

A

Strap muscle

115
Q

Origin: Sternothyroid

A

Manubrium

116
Q

Insertion: Sternothyroid

A

Thyroid cartilage

117
Q

Innervation: Sternothyroid

A

Branches of ansa cervicalis

118
Q

Action: Sternothyroid

A

Strap muscles as a group, depress larynx, hyoid bone and floor of mouth during swallowing

119
Q

Notes: Sternothyroid

A

Strap muscle

120
Q

Origin: Thyrohyoid

A

Thyroid cartilage

121
Q

Insertion: Thyrohyoid

A

Hyoid bone

122
Q

Innervation: Thyrohyoid

A

C1 fibers that run with hypoglossal nerve (CN XII)

123
Q

Action: Thyrohyoid

A

Strap muscles as a group, depress larynx, hyoid bone and floor of mouth during swallowing

124
Q

Notes: Thyrohyoid

A

Strap muscle

125
Q

Origin: Masseter

A

Zygomatic arch

126
Q

Insertion: Masseter

A

Ramus of mandible

127
Q

Innervation: Masseter

A

Mandibular division of CN V (V3)

128
Q

Action: Masseter

A
  1. Closes mandible
  2. Protracts mandible
  3. Deep fibers retract mandible
129
Q

Origin: Temporalis

A

Temporal fossa

130
Q

Insertion: Temporalis

A

Coronoid process of mandible

131
Q

Innervation: Temporalis

A

Mandibular division of CN V (V3)

132
Q

Action: Temporalis

A
  1. Closes mandible
  2. Retracts mandible
  3. Abduct towards side of abduction
133
Q

Origin: Lateral Pterygoid

A

Lateral pterygoid plate (lateral surface)

134
Q

Insertion: Lateral Pterygoid

A
  1. Neck of mandible
  2. TM joint capsule
  3. Articular disc
135
Q

Innervation: Lateral Pterygoid

A

Mandibular division of CN V (V3)

136
Q

Action: Lateral Pterygoid

A
  1. Opens mandible
  2. Protracts mandible
  3. Protracts during abduction (opposite side of abduction)
137
Q

Origin: Medial Pterygoid

A

Lateral pterygoid plate (medial surface)

138
Q

Insertion: Medial Pterygoid

A

Ramus of mandible, inner surface

139
Q

Innervation: Medial Pterygoid

A

Mandibular division of CN V (V3)

140
Q

Action: Medial Pterygoid

A

Closes mandible

141
Q

Origin: External Intercostals

A

Inferior border of upper rib

142
Q

Insertion: External Intercostals

A

Superior border of lower rib

143
Q

Innervation: External Intercostals

A

Intercostal nerves

144
Q

Action: External Intercostals

A

Elevates ribs for inhalation

145
Q

Notes: External Intercostals

A
  • Runs between adjacent ribs from tubercle of the rib as far forward as costochondral junction
  • Anteriorly external intercostal membrane continues to sternum
  • Fibers run down & forward
146
Q

Origin: Internal Intercostals

A

Inferior border of upper rib

147
Q

Insertion: Internal Intercostals

A

Superior border of lower rib

148
Q

Innervation: Internal Intercostals

A

Intercostal nerves

149
Q

Action: Internal Intercostals

A

Depresses ribs for exhalation

150
Q

Notes: Internal Intercostals

A
  • Fibers run down & backwd
  • Run from costal angle to sternum (incomplete posteriorly)
  • Continues posteriorly as the internal intercostal membrane
151
Q

Origin: Innermost Intercostals

A

Superior border of lower rib

152
Q

Insertion: Innermost Intercostals

A

Inferior border of the upper rib

153
Q

Innervation: Innermost Intercostals

A

Intercostal nerves

154
Q

Action: Innermost Intercostals

A

-

155
Q

Notes: Innermost Intercostals

A
  • Less developed than the ext and int intercostals
  • Runs down and backward
  • Found only in middle section of the intercostal space (costal angle to costochondral junction)
  • Nerves and vessels run between innermost and internal intercostal
156
Q

Notes: Innermost Intercostals

A
  • Less developed than the ext and int intercostals
  • Runs down and backward
  • Found only in middle section of the intercostal space (costal angle to costochondral junction)
  • Nerves and vessels run between innermost and internal intercostal
157
Q

Origin: Subcostal

A

Posterior rib

158
Q

Insertion: Subcostal

A

Posterior rib

159
Q

Innervation: Subcostal

A

Intercostal nerves

160
Q

Action: Subcostal

A

-

161
Q

Notes: Subcostal

A
  • On inner surface of posterior thorax

- Fibers cross 2 or 3 ribs

162
Q

Origin: Transversus Thoracis

A

Sternum

163
Q

Insertion: Transversus Thoracis

A

Costal cartilage

164
Q

Innervation: Transversus Thoracis

A

Intercostal nerves

165
Q

Action: Transversus Thoracis

A

Maintains thoracic wall during respiration

166
Q

Notes: Transversus Thoracis

A
  • On inner surface of anterior thorax
  • Fibers cross 2 or 3 ribs
  • Helps to secure blood vessels
167
Q

Origin: External Abdominal Oblique

A

Slips from lower 8 ribs

168
Q

Insertion: External Abdominal Oblique

A
  1. Aponeurosis fuses at linea alba (contributes to rectus sheath)
  2. Iliac crest
  3. ASIS
  4. Pubic tubercle
  5. Pubic crest
  6. Pubic symphysis
169
Q

Innervation: External Abdominal Oblique

A

Segmental innervation by T7-T12 or L1

170
Q

Action: External Abdominal Oblique

A
  1. Add strength to abdominal wall because of various fiber directions
  2. Protection of abdominal contents
  3. Hold in abdominal contents
  4. Support posture – lumbar stabilization especially via transverses abdominus and attachment to thoracolumbar fascia
  5. Forced expiration
  6. Bowel movement – muscles compress abdominal contents
  7. Movement of trunk
    a. Simple flexion: all muscles involved, especially rectus abdominus
    b. Pelvic tilts
    c. Oblique flexion or rotation: int oblique on one side and ext oblique on the other side work together
171
Q

Notes: External Abdominal Oblique

A
  • Interdigitates with serratus anterior
  • Fibers run medially and downward
  • Lower free edge forms inguinal ligament (ASIS to pubic tubercle)
172
Q

Origin: Internal Abdominal Oblique

A
  1. Thoracolumbar fascia

2. Iliac crest

173
Q

Insertion: Internal Abdominal Oblique

A
  1. Lower 3 or 4 ribs and costal cartilages

2. Linea alba

174
Q

Innervation: Internal Abdominal Oblique

A

Segmental innervation by T7-T12 or L1

175
Q

Action: Internal Abdominal Oblique

A
  1. Add strength to abdominal wall because of various fiber directions
  2. Protection of abdominal contents
  3. Hold in abdominal contents
  4. Support posture – lumbar stabilization especially via transverses abdominus and attachment to thoracolumbar fascia
  5. Forced expiration
  6. Bowel movement – muscles compress abdominal contents
  7. Movement of trunk
    a. Simple flexion: all muscles involved, especially rectus abdominus
    b. Pelvic tilts
    c. Oblique flexion or rotation: int oblique on one side and ext oblique on the other side work together
176
Q

Notes: Internal Abdominal Oblique

A

Fibers run medially and upward

177
Q

Origin: Transversus Abdominus

A
  1. Thoracolumbar fascia
  2. Inner surface of costal cartilages
  3. Iliac crest
178
Q

Insertion: Transversus Abdominus

A

Linea alba

179
Q

Innervation: Transversus Abdominus

A

Segmental innervation by T7-T12 or L1

180
Q

Action: Transversus Abdominus

A
  1. Add strength to abdominal wall because of various fiber directions
  2. Protection of abdominal contents
  3. Hold in abdominal contents
  4. Support posture – lumbar stabilization especially via transverses abdominus and attachment to thoracolumbar fascia
  5. Forced expiration
  6. Bowel movement – muscles compress abdominal contents
  7. Movement of trunk
    a. Simple flexion: all muscles involved, especially rectus abdominus
    b. Pelvic tilts
    c. Oblique flexion or rotation: int oblique on one side and ext oblique on the other side work together
181
Q

Notes: Transversus Abdominus

A

Fibers run horizontally

182
Q

Origin: Rectus Abdominus

A
  1. Xiphoid process

2. Costal cartilages of ribs 5-7

183
Q

Insertion: Rectus Abdominus

A
  1. Pubic crest

2. Pubic tubercle

184
Q

Innervation: Rectus Abdominus

A

Segmental innervation by T7-T12 or L1

185
Q

Action: Rectus Abdominus

A
  1. Add strength to abdominal wall because of various fiber directions
  2. Protection of abdominal contents
  3. Hold in abdominal contents
  4. Support posture – lumbar stabilization especially via transverses abdominus and attachment to thoracolumbar fascia
  5. Forced expiration
  6. Bowel movement – muscles compress abdominal contents
  7. Movement of trunk
    a. Simple flexion: all muscles involved, especially rectus abdominus
    b. Pelvic tilts
    c. Oblique flexion or rotation: int oblique on one side and ext oblique on the other side work together
186
Q

Notes: Rectus Abdominus

A

Fibers run vertically

187
Q

Origin: Splenius Cervicis

A

Spinous processes T3-T6

188
Q

Insertion: Splenius Cervicis

A

Transverse processes C1-3

189
Q

Innervation: Splenius Cervicis

A

Dorsal rami

190
Q

Action: Splenius Cervicis

A
  1. Extends neck (bilateral contraction)

2. Rotates head to same side (unilateral contraction)

191
Q

Origin: Splenius Capitis

A
  1. Spinous processes C7- T4

2. Ligamentum nuchae

192
Q

Insertion: Splenius Capitis

A
  1. Mastoid process

2. Lateral part of superior nuchal line

193
Q

Innervation: Splenius Capitis

A

Dorsal rami

194
Q

Action: Splenius Capitis

A
  1. Extends neck (bilateral contraction)

2. Rotates head to same side (unilateral contraction)

195
Q

Origin: Erector Spinae Iliocostalis

a. Lumborum
b. Thoracis
c. Cervicis

A

a. Lumborum (common origin):
1. Iliac crest
2. Sacrum
3. Spinous processes of T11-T12
4. Lumbar vertebrae
b. Thoracis: lower ribs
c. Cervicis: upper ribs

196
Q

Insertion: Erector Spinae Iliocostalis

a. Lumborum
b. Thoracis
c. Cervicis

A
  1. Lumborum: lower ribs
  2. Thoracis: upper ribs insertion
  3. Cervicis: cervical transverse processes
197
Q

Innervation: Erector Spinae Iliocostalis

a. Lumborum
b. Thoracis
c. Cervicis

A

Dorsal rami

198
Q

Action: Erector Spinae Iliocostalis

a. Lumborum
b. Thoracis
c. Cervicis

A
  1. Extends back (bilateral contraction)
  2. Lateral flexion of trunk (unilateral contraction)
  3. Controls flexion eccentrically against gravity
199
Q

Notes: Erector Spinae Iliocostalis

a. Lumborum
b. Thoracis
c. Cervicis

A

Most lateral portion of erector spinae

200
Q

Origin: Erector Spinae Longissimus

a. Thoracis
b. Cervicis
c. Capitis

A

Thoracis (common origin):

  1. Iliac crest
  2. Sacrum
  3. Spinous processes of T11-T12
  4. Lumbar vertebrae

Cervicis: upper 4-6 thoracic transverse processes

Capitis: upper cervical transverse processes

201
Q

Insertion: Erector Spinae Longissimus

a. Thoracis
b. Cervicis
c. Capitis

A

Thoracis: lateral ribs and thoracic transverse processes

Cervicis: cervical 2-6 processes

Capitis: mastoid process

202
Q

Innervation: Erector Spinae Longissimus

a. Thoracis
b. Cervicis
c. Capitis

A

Dorsal rami

203
Q

Action: Erector Spinae Longissimus

a. Thoracis
b. Cervicis
c. Capitis

A
  1. Extends back (bilateral contraction)
  2. Lateral flexion of trunk (unilateral contraction)
  3. Controls flexion eccentrically against gravity
204
Q

Notes: Erector Spinae Longissimus

a. Thoracis
b. Cervicis
c. Capitis

A

Intermediate portion of erector spinae

205
Q

Origin: Erector Spinae Spinalis

A

Lower thoracic spinous processes

206
Q

Insertion: Erector Spinae Spinalis

A

Upper thoracic spinous processes

207
Q

Innervation: Erector Spinae Spinalis

A

Dorsal rami

208
Q

Action: Erector Spinae Spinalis

A
  1. Extends back (bilateral contraction)
  2. Lateral flexion of trunk (unilateral contraction)
  3. Controls flexion eccentrically against gravity
209
Q

Notes: Erector Spinae Spinalis

A

Only well developed in thoracic region

210
Q

Origin: Semispinalis

a. Thoracis
b. Cervicis
c. Capitis

A

Thoracis and cervicis: transverse processes at appropriate level

Capitis: inferior nuchal line

211
Q

Insertion: Semispinalis

a. Thoracis
b. Cervicis
c. Capitis

A

Thoracis and cervicis: spinous processes at appropriate level

Capitis: superior nuchal line

212
Q

Innervation: Semispinalis

a. Thoracis
b. Cervicis
c. Capitis

A

Dorsal rami

213
Q

Action: Semispinalis

a. Thoracis
b. Cervicis
c. Capitis

A

Rotation to the opposite side

214
Q

Notes: Semispinalis

a. Thoracis
b. Cervicis
c. Capitis

A

Transversospinalis muscles
-Well developed in cervical area, not seen in lumbar area
Lie deep to and are shorter than erector spinae fibers
-Thoracis and cervicis fibers cross 4-6 segments
-Thoracis and cervicis run upward from lateral to medial (transverse process to spinous process)
-Capitis fibers run vertically

215
Q

Origin: Multifidus

A

Transverse processes

216
Q

Insertion: Multifidus

A

Spinous processes

217
Q

Innervation: Multifidus

A

Dorsal rami

218
Q

Action: Multifidus

A

Rotation to the opposite side

219
Q

Notes: Multifidus

A

Transversospinalis muscles

  • Lie deep to and are shorter than erector spinae fibers
  • Cross 2-4 segments up to C2
  • Well developed in lumbar region and easily seen there b/c there is no semispinalis in lumbar
  • Run upward from lateral to medial (transverse process to spinous process)
220
Q

Origin: Rotators

A

Transverse processes

221
Q

Insertion: Rotators

A

Spinous processes

222
Q

Innervation: Rotators

A

Dorsal rami

223
Q

Action: Rotators

A

Rotation to the opposite side

224
Q

Notes: Rotators

A

Transversospinalis muscles

  • Lie deep to and are shorter than erector spinae fibers
  • Cross 1 (short) to 2 (long) segments
  • Run upward from lateral to medial (transverse process to spinous process)
225
Q

Origin: Segmental muscles

a. Interspinales
b. Intertransversarii

A

Across adjacent vertebrae on either transverse processes or deep

226
Q

Insertion: Segmental muscles

a. Interspinales
b. Intertransversarii

A

-

227
Q

Innervation: Segmental muscles

a. Interspinales
b. Intertransversarii

A

Dorsal rami

228
Q

Action: Segmental muscles

a. Interspinales
b. Intertransversarii

A

Extends from one vertebra to the next

229
Q

Notes: Segmental muscles

a. Interspinales
b. Intertransversarii

A

Only found in cervical and lumbar regions

Will not see in lab

230
Q

Origin: Obliquus Capitis Inferior

A

Spinous process of axis

231
Q

Insertion: Obliquus Capitis Inferior

A

Transverse process of atlas

232
Q

Innervation: Obliquus Capitis Inferior

A

Suboccipital nerve (C1)

233
Q

Action: Obliquus Capitis Inferior

A

Rotates atlas and head to same side

234
Q

Notes: Obliquus Capitis Inferior

A
  • Suboccipital muscles

- Connect atlas & axis to each other and to the skull

235
Q

Origin: Obliquus Capitis Superior

A

Transverse process of atlas

236
Q

Insertion: Obliquus Capitis Superior

A

Near inferior nuchal line

237
Q

Innervation: Obliquus Capitis Superior

A

Suboccipital nerve (C1)

238
Q

Action: Obliquus Capitis Superior

A
  1. Extends neck (bilateral contraction)

2. Lateral flexion of neck (unilateral contraction)

239
Q

Notes: Obliquus Capitis Superior

A

Suboccipital muscles

Connect atlas and axis to each other and to the skull

240
Q

Origin: Rectus Capitis Posterior Major

A

Spinous process of axis

241
Q

Insertion: Rectus Capitis Posterior Major

A

Inferior nuchal line near middle

242
Q

Innervation: Rectus Capitis Posterior Major

A

Suboccipital nerve (C1)

243
Q

Action: Rectus Capitis Posterior Major

A

Extends neck (bilateral contraction)

244
Q

Notes: Rectus Capitis Posterior Major

A

Suboccipital muscles

Connect atlas and axis to each other and to the skull

245
Q

Origin: Rectus Capitis Posterior Minor

A

Posterior tubercle of atlas

246
Q

Insertion: Rectus Capitis Posterior Minor

A

Partially under cover of Major near inferior nuchal line

247
Q

Innervation: Rectus Capitis Posterior Minor

A

Suboccipital nerve (C1)

248
Q

Action: Rectus Capitis Posterior Minor

A

Extends neck (bilateral contraction)

249
Q

Notes: Rectus Capitis Posterior Minor

A

Suboccipital muscles

Connect atlas and axis to each other and to the skull

Anatomy (7 decks)

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