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Posterior Shoulder Muscles Flashcards

(65 cards)

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1
Q

Trapezius Origin

A

Medial third of superior nuchal line; external occipital protuberance; nuchal ligament; spinous processes of C7-T12 vertebrae

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2
Q

Trapezius Insertion

A

Lateral third of clavicle; acromion and spine of scapula

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3
Q

Trapezius Innervation

A

Spinal accessory nerve (CN XI) (motor fibers) and C3, C4 spinal nerves (pain and proprioceptive fibers)

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4
Q

Trapezius Action

A

Descending part elevates; ascending part depresses; and middle part(or all parts together) retracts scapula; descending and ascending parts act together to rotate glenoid cavity superiorly

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5
Q

Trapezius Roots

A

C3,C4

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6
Q

Latissimus Dorsi Origin

A

Spinous processes of the inferior 6 thoracic vertebrae, thoracolumbar fascia, iliac crest, and inferior 3 or 4 ribs

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7
Q

Latissimus Dorsi Insertion

A

Floor of intertubercular sulcus of humerus

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8
Q

Latissimus Dorsi Innervation

A

Thoracodorsal nerve (C6, C7, C8)

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9
Q

Latissimus Dorsi Action

A

Extends, adducts, and medially rotates humerus; raises body toward arms during climbing

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10
Q

Latissimus Dorsi Roots

A

C6, C7, C8

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11
Q

Rhomboid Minor & Major Origin

A

Minor: nuchal ligament; spinous processes of C7 and T1 vertebrae

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12
Q

Rhomboid Minor & Major Insertion

A

Minor: smooth triangular area at medial and scapular spine

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13
Q

Rhomboid Minor & Major Innervation

A

Dorsal scapular nerve (C4, C5)

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14
Q

Rhomboid Minor & Major Action

A

Retract scapula and rotate it to depress glenoid cavity; fix scapula to thoracic wall

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15
Q

Rhomboid Minor & Major Root

A

C4, C5

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16
Q

Levator Scapulae Origin

A

Posterior tubercles of transverse processes of C1-C4 vertebrae

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17
Q

Levator Scapulae Insertion

A

Medial border of scapula superior to root of scapular spine

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18
Q

Levator Scapulae Innervation

A

Dorsal scapular (C5) and cervical (C3, C4) nerves

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19
Q

Levator Scapulae Action

A

Elevates scapula and tilts its glenoid inferiorly by rotating scapula

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20
Q

Serratus Anterior Origin

A

External surfaces of lateral parts of 1st-8th ribs

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21
Q

Serratus Anterior Insertion

A

Anterior surface of medial border of scapula

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22
Q

Serratus Anterior Innervation

A

Long thoracic nerve (C5,C6,C7)

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23
Q

Serratus Anterior Action

A

Protracts scapula and holds it against thoracic wall; rotates scapula

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24
Q

Serratus Anterior Root

A

C5,C6,C7

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25
Infraspinatus Origin
Infraspinous fossa of scapula
26
Infraspinatus Insertion
Middle facet of greater tubercle of humerus
27
Infraspinatus Innervation
Suprascapular nerve (C5,C6)
28
Infraspinatus Action
Laterally rotates arm; and acts with rotator cuff muscles
29
Infraspinatus Root
C5,C6
30
Teres Minor Origin
Middle part of lateral border of scapula
31
Teres Minor Insertion
Inferior facet of greater tubercle of humerus
32
Teres Minor Innervation
Axillary nerve (C5,C6)
33
Teres Minor Action
Laterally rotates arm; and acts with rotator cuff muscles
34
Teres Minor Root
C5,C6
35
Teres Major Origin
Posterior surface of inferior angle of scapula
36
Teres Major Insertion
Medial lip of intertubercular sulcus of humerus
37
Teres Major Innervation
Lower subscapular nerve (C5,C6)
38
Teres Major Action
Adducts and medially rotates arm
39
Teres Major Root
C5,C6
40
Subscapularis Origin
Subscapular fossa (most of anterior surface of scapula)
41
Subscapularis Insertion
Lesser tubercle of humerus
42
Subscapularis Innervation
Upper and lower subscapular nerves (C5,C6,C7)
43
Subscapularis Action
Medially rotates arm; as part of rotator cuff, helps hold head of humerus in glenoid cavity
44
Subscapularis Root
C5,C6,C7
45
Omohyoid Origin
Superior border od scapula near suprascapular notch
46
Omohyoid Insertion
Inferior border of hyoid
47
Omohyoid Innervation
C1-C3 by a branch of ansa cervicalis
48
Omohyoid Action
Depresses, retracts, and steadies hyoid
49
Omohyoid Root
C1-C3
50
Deltoid Anterior (Clavicular) Origin
Lateral third of the clavicle
51
Deltoid Anterior (Clavicular) Insertion
Deltoid tuberosity of humerus
52
Deltoid Anterior (Clavicular) Innervation
Axillary nerve
53
Deltoid Anterior (Clavicular) Action
Flexion, medial (internal) rotation and abduction of arm
54
Deltoid Middle (Acromial) Origin
Acromion of scapula
55
Deltoid Middle (Acromial) Insertion
Deltoid tuberosity
56
Deltoid Middle (Acromial) Innervation
Axillary nerve
57
Deltoid Middle (Acromial) Action
Abduction of arm
58
Deltoid Posterior (Spinal) Origin
Spine of the scapula
59
Deltoid Posterior (Spinal) Insertion
Deltoid tuberosity
60
Deltoid Posterior (Spinal) Innervation
Axillary nerve
61
Deltoid Posterior (Spinal) Action
Extension, lateral, (external) rotation and abduction of arm
62
Supraspinatus Origin
Supraspinous fossa of scapula
63
Supraspinatus Insertion
Anterior facet of greater tubercle of humerus
64
Supraspinatus Innervation
Suprascapular nerve
65
Supraspinatus Action
Stabilize humeral head in glenoid fossa; initial abduction of humerus to ~ 15 degrees

pt gross (17 decks)

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