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17 Cards in this Set
- Front
- Back
Teres minor
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Origin: middle half of the scapulas lateral margin
Insertion: lowest of three facets of the greater tubercle of humerus Action: lateral rotation of the humerus stabilizes the glenohumeral joint |
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Teres major
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Origin: inferior, lateral margin of the scapula
Insertion: crest of lesser tubercle (just medial to the insertion of latissimus dorsi) Action: assists in adduction of arm assists in medial rotation of arm assists in extension from an flexed position |
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Subscapularis
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Origin: subscapular fossa
Insertion: lesser tubercle of humerus Action: medial rotation of the humerus stabilizes the glenohumeral joint |
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Splenius capitis
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Origin:
lower portion of ligamentum nuchae spinous processes of C3-T3(4) Insertion: superior nuchal line mastoid process of temporal bone Action: bilateral contraction: extend head & neck unilateral contraction: rotate and laterally bend head & neck to the contracted (same) side |
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Splenius cervicis
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Origin: spinous process of T3-T6
Insertion: posterior tubercles of transverse processes of C2-C4 Action: bilateral contraction: extend head & neck unilateral contraction: rotate and laterally bend head & neck to the contracted (same) side |
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Trapezius
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Origin:
external occipital protuberance along the medial sides of the superior nuchal line ligamentum nuchae (surrounding the cervical spinous processes) spinous processes of C1-T12 Insertion: posterior, lateral 1/3 of clavicle acromion superior spine of scapula Action: elevates scapula upward rotation of the scapula (upper fibers) downward rotation of the scapula (lower fibers) retracts scapula |
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Latissimus dorsi
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Origin:
spinous process of T7-L5 upper 2-3 sacral segments iliac crest lower 3 or 4 Ribs Insertion: lateral lip of the intertubercular groove Action: adduction of humerus medial rotation of the humerus extension from flexed position downward rotation of the scapula |
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Subclavius
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Origin: first rib about the junction of bone and cartilage
Insertion: lower surface of clavicle Action: assists in stabilizing the clavicle |
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Pectoralis major
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Origin:
medial 1/3 of clavicle anterior aspect of manubrium & length of body of sternum cartilaginous attachments of upper 6 ribs external oblique's aponeurosis Insertion: lateral lip of bicipital groove to the crest of the greater tubercle clavicular fibers insert more distally; sternal fibers more proximally Action: adducts humerus medially rotates humerus flexion of the arm from extension (clavicular portion) |
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Pectoralis minor
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Origin: outer surface of ribs 2-5 or 3-5 or 6
Insertion: medial aspect of coracoid process of the scapula Action: depresses & downwardly rotates the scapula assists in scapular protraction from a retracted position stabilizes the scapula |
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Levator scapulae
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Origin: transverse processes of C1-C3 or C4
Insertion: superior angle of scapula toward the scapular spine Action: elevates the scapula extends and/or laterally flexes the head |
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Rhomboid minor
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Origin:
spinous process of C7 & T1 ligamentum nuchae supraspinous ligament Insertion: medial margin of the scapula at the medial angle Action: retract scapula |
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Rhomboid major
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Origin:
spinous processes of T2-T5 supraspinous ligament Insertion: medial scapula from the scapular spine to the inferior angle Action: retract scapula |
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Serratus anterior
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Origin: fleshy slips from the outer surface of upper 8 or 9 ribs
Insertion: costal aspect of medial margin of the scapula Action: protract scapula stabilize scapula assists in upward rotation |
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Deltoid
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Origin:
lateral, anterior 1/3 of distal clavicle lateral boarder of the acromion scapular spine Insertion: deltoid tuberosity of humerus Action: abducts arm flexion and medial rotation (anterior portion) extension and lateral rotation (posterior portion) |
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Supraspinatus
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Origin:
supraspinous fossa muscle fascia Insertion: uppermost of three facets of the greater tubercle of humerus Action: abduction of arm (first 15-20°) stabilizes glenohumeral joint |
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Infraspinatus
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Origin:
infraspinous fossa muscle fascia Insertion: middle facet of greater tubercle of humerus Action: external rotation of the humerus stabilizes the glenohumeral joint |