Back and Neck Muscle IIOA

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26 Terms

1
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<p>Trapezius (Superficial Extrinsic Back Muscle)</p><p>Origin?</p><p>Insertion?</p><p>Action?</p><p>Innervation?</p>

Trapezius (Superficial Extrinsic Back Muscle)

Origin?

Insertion?

Action?

Innervation?

O- medial part of superior nuchal line, external occipital protuberance, nuchal ligament, spinous processes of C7-T12

I- Lateral end of clavicle, acromion/spine of scap

A- Descending part elevates scapula, ascending depresses scapula, middle retracts scapula, ascending/descending rotate glenoid cavity superiorly

I- Spinal accessory nerve (CN XI) + C2-C4 anterior rami

2
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<p>Latissimus Dorsi (Superficial Extrinsic Back Muscle)</p><p>Origin?</p><p>Insertion?</p><p>Action?</p><p>Innervation?</p>

Latissimus Dorsi (Superficial Extrinsic Back Muscle)

Origin?

Insertion?

Action?

Innervation?

O- Spinous processes of last 6 thoracic vertebrae, thoracolumbarfascia, iliac crest, and last 3-4 ribs

I- Floor of intertubercular sulcus of humerus [bicipital groove] (front part between greater/lesser tubercles)

A- Extends, adducts, medially rotates humerus, raises body towards arm during climbing

I- Thoracodorsal nerve (C6-C8)

3
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<p>Levator Scapulae (Superficial Extrinsic Back Muscle)</p><p>Origin?</p><p>Insertion?</p><p>Action?</p><p>Innervation?</p>

Levator Scapulae (Superficial Extrinsic Back Muscle)

Origin?

Insertion?

Action?

Innervation?

O- Posterior tubercle of transverse processes of C1-C4

I- Medial border of scap above scap spine

A- elevate scap, rotates glenoid cavity inferiorly

I- Dorsal scapular (C4/C5) cervical nerve (C3/C4)

4
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<p>Rhomboid Major (Superficial Extrinsic Back Muscles)</p><p>Origin?</p><p>Insertion?</p><p>Action?</p><p>Innervation?</p>

Rhomboid Major (Superficial Extrinsic Back Muscles)

Origin?

Insertion?

Action?

Innervation?

O- Spinous process T2-T5

I- medial end of scap from scap spine to inferior angle

A- Retract scap, rotate glenoid cavity inferior, fix scap to thoracic wall (same as minor)

I- Dorsal scapular nerve (C4/C5) ( same as Minor)

5
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<p>Rhomboid Minor (Superficial Extrinsic Back Muscles)</p><p>Origin?</p><p>Insertion?</p><p>Action?</p><p>Innervation?</p>

Rhomboid Minor (Superficial Extrinsic Back Muscles)

Origin?

Insertion?

Action?

Innervation?

O- Nuchal lig, spinous process of C7/T1

I- medial area of scap spine

A- Retracts scap, rotates glenoid cavity inferiorly, fixes scap to thoracic wall (Same as Major)

I- Dorsal scapular nerve (C4/C5) (Same a Major)

6
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<p>Serratus Posterior Superior (Intermediate Extrinsic Back Muscle)</p><p>Origin?</p><p>Insertion?</p><p>Action?</p><p>Innervation?</p>

Serratus Posterior Superior (Intermediate Extrinsic Back Muscle)

Origin?

Insertion?

Action?

Innervation?

O- spinous processes of C6 to T3, including supraspinous ligaments and ligamentum nuchae

I- posterior surfaces of ribs 2 to 5, near their angles

A- Proprioceptive

I- Intercostal Nerves

7
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<p>Serratus Posterior Inferior (Intermediate Extrinsic Back Muscle)</p><p>Origin?</p><p>Insertion?</p><p>Action?</p><p>Innervation?</p>

Serratus Posterior Inferior (Intermediate Extrinsic Back Muscle)

Origin?

Insertion?

Action?

Innervation?

O- spinous processes and supraspinous ligaments of T11 to L3

I- posterior surfaces of ribs 9 to 12, near their angles

A- Proprioceptive

I- Intercostal Nerves

8
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<p>Splenius Cervicis (Intrinsic Back Muscle (Superficial)/lateral vertebral muscle)</p><p>Origin?</p><p>Insertion?</p><p>Action?</p><p>Innervation?</p>

Splenius Cervicis (Intrinsic Back Muscle (Superficial)/lateral vertebral muscle)

Origin?

Insertion?

Action?

Innervation?

O- nuchal ligament and spinous process of C7-T6 ( Same as Capitis)

I- Tubercles of transverse process of C1-C4

A- Unilateral= ipsilateral lateral flexion/rotation

Biilateral= extension of head/neck. Maintain posture, help control vertebral column (Same as Capitis)

I- dorsal rami of spinal n roots of C2-C8 (Same as Capitis)

9
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<p>Splenius Capitis (Intrinsic Back Muscle(Superficial))</p><p>Origin?</p><p>Insertion?</p><p>Action?</p><p>Innervation?</p>

Splenius Capitis (Intrinsic Back Muscle(Superficial))

Origin?

Insertion?

Action?

Innervation?

O- nuchal ligament and spinous process of C7-T6 ( Same as Cervicis)

I- superolaterally to mastoid process and superior nuchal line

A- Unilateral= ipsilateral lateral flexion/rotation

Biilateral= extension of head/neck. Maintain posture, help control vertebral column (Same as Cervicis)

I- dorsal rami of spinal n roots of C2-C8 (Same as Cervicis)

10
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<p>Iliocostalis (Intrinsic Back Muscle(Intermedicate) [Erector Spinae Group]</p><p>Origin?</p><p>Insertion?</p><p>Action?</p><p>Innervation?</p>

Iliocostalis (Intrinsic Back Muscle(Intermedicate) [Erector Spinae Group]

Origin?

Insertion?

Action?

Innervation?

O- broad tendon of iliac crest, posterior surface of sacrum, sacro-iliac ligs, sacral and inferior lumbar spinous processes, supraspinous lig

I- superior to angles of lower ribs and cervical processes(Only difference from Longissimus and Spinalis)

A- Anteriorly tilt pelvis, extending spine, laterally flex spine

I- dorsal rami of adjacent spinal nerve roots (C3–L5)

11
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<p>Longissimus (Intrinsic Back Muscle(Intermedicate) [Erector Spinae Group]</p><p>Origin?</p><p>Insertion?</p><p>Action?</p><p>Innervation?</p>

Longissimus (Intrinsic Back Muscle(Intermedicate) [Erector Spinae Group]

Origin?

Insertion?

Action?

Innervation?

O- broad tendon of iliac crest, posterior surface of sacrum, sacro-iliac ligs, sacral and inferior lumbar spinous processes, supraspinous lig

I- superior to ribs between tubercles and angles to transverse processes in thoracic and cervical regions, to mastoid process in temporal bone (Only difference from Iliocostalis and Spinalis)

A- Anteriorly tilt pelvis, extending spine, laterally flex spine

I- dorsal rami of adjacent spinal nerve roots (C3–L5)

12
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<p>Spinalis (Intrinsic Back Muscle(Intermedicate) [Erector Spinae Group]</p><p>Origin?</p><p>Insertion?</p><p>Action?</p><p>Innervation?</p>

Spinalis (Intrinsic Back Muscle(Intermedicate) [Erector Spinae Group]

Origin?

Insertion?

Action?

Innervation?

O- broad tendon of iliac crest, posterior surface of sacrum, sacro-iliac ligs, sacral and inferior lumbar spinous processes, supraspinous lig

I- superior to spinous processes in thorac to cranium (Only difference from Iliocostalis and Longissimus)

A- Anteriorly tilt pelvis, extending spine, laterally flex spine

I- dorsal rami of adjacent spinal nerve roots (C3–L5)

13
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<p>Semispinalis(Capitis, Cervicis, and Thoracis) (Intrinsic Back Deep Muscle) [Suboccipital TRIANGLE Structure] [Roof]</p><p>Origin?</p><p>Insertion?</p><p>Action?</p><p>Innervation?</p>

Semispinalis(Capitis, Cervicis, and Thoracis) (Intrinsic Back Deep Muscle) [Suboccipital TRIANGLE Structure] [Roof]

Origin?

Insertion?

Action?

Innervation?

O- transverse processes of C4-T12

I- superomedially to occipital bone, spinous process of thoracic/cervical vertebrae,

A- Extension and contralateral rotation of head, cervical, and thoracic regions

I- C1-T6 (dorsal rami)

14
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<p>Multifidus (Intrinsic Back Muscle(Deep))</p><p>Origin?</p><p>Insertion?</p><p>Action?</p><p>Innervation?</p>

Multifidus (Intrinsic Back Muscle(Deep))

Origin?

Insertion?

Action?

Innervation?

O- posterior sacrum, posterior superior iliac spine, erector spinae aponeurosis, sacro-iliiac ligs, mammillary processes of lumbar vertebrae, tranverse processes of T1-T3, articular process C4-C7

I- entire length of spinous processes

A- stabalize during walking

I- posterior rami of C3-C7

15
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<p>Rectus Capitis Posterior Major (Intrinsic Back Deep Muscle) [Subocciptal TRIANGLE muscles Superomedial Boundary]</p><p>Origin?</p><p>Insertion?</p><p>Action?</p><p>Innervation?</p>

Rectus Capitis Posterior Major (Intrinsic Back Deep Muscle) [Subocciptal TRIANGLE muscles Superomedial Boundary]

Origin?

Insertion?

Action?

Innervation?

O- Spinous process C2

I- Lateral part of inferior nuchal line of occipital bone

A- Extend neck, lateral flex, rotate neck

I- suboccipital nerve (posterior rami of C1) (Same as Minor and Obliquus capitis inferior/superior)

16
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<p>Rectus Capitis Posterior Minor (Intrinsic Back Deep Muscle) [Suboccipital Muscles]</p><p>Origin?</p><p>Insertion?</p><p>Action?</p><p>Innervation?</p>

Rectus Capitis Posterior Minor (Intrinsic Back Deep Muscle) [Suboccipital Muscles]

Origin?

Insertion?

Action?

Innervation?

O- posterior tubercle of posterior arch of C1

I- Inferior nuchal line

A- Extend neck

I- suboccipital nerve (posterior rami of C1) (Same as Major and Obliquus capitis inferior/superior)

<p>O- posterior tubercle of posterior arch of C1</p><p>I- Inferior nuchal line</p><p>A- Extend neck</p><p>I- suboccipital nerve (posterior rami of C1) (Same as Major and Obliquus capitis inferior/superior)</p>
17
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<p>Obliquus Capitis Inferior (Intrinsic Back Deep Muscle) [Suboccipital TRIANGLE Muscles Inferolateral Boundary]</p><p>Origin?</p><p>Insertion?</p><p>Action?</p><p>Innervation?</p>

Obliquus Capitis Inferior (Intrinsic Back Deep Muscle) [Suboccipital TRIANGLE Muscles Inferolateral Boundary]

Origin?

Insertion?

Action?

Innervation?

O- Spinous process C2

I- Transverse process C1

A- Extend/Rotate neck

I- Suboccipital nerve (posterior rami of C1) (Same as Superior and Rectus capitis major/minor)

18
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<p>Obliquus Capitis Superior (Intrinsic Back Deep Muscle) [Suboccipital Muscles Superolateral Boundary]</p><p>Origin?</p><p>Insertion?</p><p>Action?</p><p>Innervation?</p>

Obliquus Capitis Superior (Intrinsic Back Deep Muscle) [Suboccipital Muscles Superolateral Boundary]

Origin?

Insertion?

Action?

Innervation?

O- Transverse process C2

I- Occipital bone between both nuchal lines

A- Extend neck, lateral flex

I- Suboccipital nerve (Posterior rami of C1) (Same as Inferior and Rectus Capitis posterior major/minor)

19
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Sternocleidomastoid

Origin?

Insertion?

Action?

Innervation?

O- Manubrium, clavicular head, posterior surface of medial first part of clavicle

I- Mastoid process and superior nuchal line of occiptal bone

A- Unilateral= lateral flexion, contralateral rotation

Bilateral= flexes neck down to sternum, and also flexes/protudes chin while extending neck slightly (lying down)

I- Spinal accessory nerve (CN XI)

20
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Deltoid

Origin?

Insertion?

Action?

Innervation?

O- lateral third of clavcle, acromion and spine of scap

I- deltoid tuberosity of humerous

A- anterior: flex/medially rotate arm middle/acromial: abducts, posterior: extends/laterally rotates arm

I- Axillary n. (C5, C6)

21
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Supraspinatus

Origin?

Insertion?

Action?

Innervation?

O- Supraspinous fossa of scap

I- Superior facet of greater tubercle of humerus

A- Helps deltoid abduct arm, helps rotator cuff

I- Suprascapular n. (C5, C6)

22
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Infraspinatus

Origin?

Insertion?

Action?

Innervation?

O- Infraspinous fossa of scap

I- Middle facet of greater tubercle of humerus

A- Lateral rotates arm, helps rotator cuff

I- Suprascapular n. (C5, C6)

23
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Teres Minor

Origin?

Insertion?

Action?

Innervation?

O- Middle part of lateral border of scap

I- Inferior facet of greater tubercle of humerus

A- Lateral rotates arm, helps rotator cuff

I- Axillary n. (C5, C6)

24
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Teres Major

Origin?

Insertion?

Action?

Innervation?

O- Posterior surface of inferior angle of scap

I- Medical lip of intertubercular sulcus of humerus

A- adducts, medially rotates arm

I- Lower subscapular n. (C5-C7)

25
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Subscapularis

Origin?

Insertion?

Action?

Innervation?

O- Subscapular fossa

I- Lesser tubercle of humerus

A- Medially rotates arm

I- Upper and lower subscapular n. (C5-C7)

26
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Serratus anterior (Deep to Subscap)

Origin?

Insertion?

Action?

Innervation?

O- External surface of lateral parts of 1-8 ribs

I- Anterior surface of medial border of scap

A- Protracts and rotates scap

I- Long thoracic n.