Shoulder Girdle
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
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| Upper Trapezius Medial Attachment | External occipital protuberance (EOP)
Ligamentum nuchae
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| Upper Trapezius Lateral Attachment | poster, lateral 1/3 of clavicle
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| Middle Trapezius Medial Attachment | SP C7 & T1-T3
(aka SP C7-T3)
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| Middle Trapezius Lateral Attachment | medial margin of acromion
superior lip (upper border) of scapular spine
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| Lower Trapezius Medial Attachment | SP T4-T12
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| Lower Trapezius Lateral Attachment | base of scapular spine
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| Trapezius Action(s) with the medial attachment (or trunk) fixed | middle fibers: adduction of scapula
upper fibers: stabilization, upward rotation, elevation
lower fibers: stabilization, upward rotation, depression
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| Trapezius Action(s) with the lateral attachment (or scapula) fixed | unilaterally --> upper fibers:
- extension of the neck
- lateral flexion
- opposite side rotation
bilaterally --> upper fibers:
- extension of the neck
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| Trapezius Nervous Innervation | cranial nerve XI (spinal accessory)
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| Rhomboid Minor Medial Attachment | SP C7 & T1
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| Rhomboid Minor Lateral Attachment | medial border at base of spine of scapula
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| Rhomboid Minor Action(s) | adduction
elevation
downward rotation
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| Rhomboid Minor Nervous Innervation | dorsal scapular (C5)
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| Rhomboid Major Medial Attachment | SP T2 - T5
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| Rhomboid Major Lateral Attachment | medial border of scapula between the spine and inferior angle
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| Rhomboid Major Action(s) | adduction
elevation
downward rotation
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| Rhomboid Major Nervous Innervation | dorsal scapular (C5)
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| Levator Scapulae Medial Attachment | TP C1 - C4
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| Levator Scapulae Lateral Attachment | medial border of scapula between superior angle and root of spine
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| Levator Scapulae Action(s) with the medial attachment (or trunk) fixed | elevation of the scapula
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| Levator Scapulae Action(s) with the lateral attachment fixed | unilaterally:
- lateral flexion
- same side rotation
bilaterally:
- extension of cervical spine
-
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| Serratus Anterior Medial Attachment | costal (anterior) surface of medial border of scapula
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| Serratus Anterior Action(s) | abduction
upward rotation
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| Serratus Anterior Innervation | long thoracic
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| Pectoralis Minor Inferior Attachment | anterior surface ribs 3-5
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| Pectoralis Minor Superior Attachment | medial surface of coracoid process
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| Pectoralis Minor Action(s) | anterior tilt
forced inspiration assistance
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| Pectoralis Minor Innervation | pectoral (C8-T1)
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| Trapezius Action(s) (Upper Muscle Fibers) | with the medial attachment (or trunk) fixed:
- upward rotation
- elevation
- stabilization
with the lateral attachment or scapula fixed:
- unilaterally: extension, lateral flexion, & opposite side rotation
-bilaterally: extension of the neck
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| Trapezius Action(s) (Middle Muscle Fibers) | abduction of the scapula
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| Trapezius Action(s) (Lower Muscle Fibers) | with the medial attachment (or trunk) fixed:
- upward rotation
- depression
- stabilization
with the lateral attachment or scapula fixed:
- none
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| Muscles that perform elevation | rhomboids
trapezius
levator scapulae
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| Muscles that perform depression | trapezius
pectoralis minor
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| Muscles that perform adduction | rhomboids
trapezius
levator scapulae
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| Muscles that perform abduction | serratus anterior
pectoralis minor
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| Muscles that perform upward rotation | trapezius
serratus anterior
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| Muscles that perform downward rotation | rhomboids (major & minor)
pectoralis minor
levator scapulae
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Created by:
rmo217
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