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Human Anatomy Fall 2017 > Muscles Superficial back > Flashcards

Muscles Superficial back Flashcards

1
Q

Supraspinatus Origin

A

Supraspinous fossa of scapula

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2
Q

Supraspinatus Insertion

A

greater tubercle of humerus

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3
Q

Supraspinatus Innervation

A

Suprascapular nerve

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4
Q

Supraspinatus Action

A

1) Initiates and assists deltoid in abduction of arm

2) Acts with rotator cuff muscles (RCM)

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5
Q

Supraspinatus Blood Supply

A

Suprascapular artery

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6
Q

Infraspinatus Origin

A

Infraspinous fossa of scapula

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7
Q

Infraspinatus Insertion

A

greater tubercle of humerus

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8
Q

Infraspinatus Innervation

A

Suprascapular nerve

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9
Q

Infraspinatus Action

A

1) Laterally rotates arm

2) Acts with RCM

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10
Q

Infraspinatus Blood Supply

A

Suprascapular artery

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11
Q

Teres Major Origin

A

Inferior angle of scapula

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12
Q

Teres Major Insertion

A

Intertubercular groove

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13
Q

Teres Major Innervation

A

Lower subscapular nerve

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14
Q

Teres Major Action

A

1) Adducts arm
2) medially rotates arm
* **NOT RCM

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15
Q

Teres Major Blood Supply

A

Subscapular and circumflex scapular arteries

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16
Q

Teres Minor Origin

A

Lateral border of scapula

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17
Q

Teres Minor Insertion

A

greater tubercle on humerus

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18
Q

Teres Minor Innervation

A

Axillary nerve

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19
Q

Teres Minor Action

A

1) Laterally rotate arm

2) acts as RCM

20
Q

Teres Minor Blood Supply

A

Subscapular and circumflex scapular arteries

21
Q

Subscapularis Origin

A

Subscapular fossa (anterior most part of scapula directly against ribs)

22
Q

Subscapularis Insertion

A

Lesser tubercle of humerus

23
Q

Subscapularis Innervation

A

Upper and lower subscapular nerves

24
Q

Subscapularis Action

A

1) medially rotates arm

2) acts as RCM

25
Q

Subscapularis Blood Supply

A

Subscapular artery

26
Q

Trapezius Origin

A

1) Nuchal line
2) Nuchal ligament
3) exterior occiptal protuberance
4) T7-T12 spinous processes

27
Q

Trapezius Insertion

A

1) spine of scapula
2) acromion
3) lateral 3rd of clavicle

28
Q

Trapezius Innervation

A

Cranial Nerve 11 (spinal accessory nerve)

29
Q

Trapezius Action

A

1) Ascending fibers: Depress scapula (lower shoulder)
2) Middle fibers: Retract scapula (pull it posteriorly)
3) Descending fibers: elevate scapula
4) Rotates scapula superiorly (with serratus anterior)
* *Descending and ascending act together to rotate glenoid cavity superiorly

30
Q

Trapezius Blood Supply

A

transverse cervical artery

31
Q

Latissimus Dorsi Origin

A

T6 to thoracolumbar fascia, attaches to sacrum and illiac crest

32
Q

Latissimus Dorsi Insert

A

Intertuburcular groove of humerus

33
Q

Latissimus Dorsi Innervation

A

Thoracodorsal nerve

34
Q

Latissimus Dorsi Action

A

1) Extends arm
2) Medially rotate arm/humerus
3) Propel body upwards while climbing
4) Adducts arm (with trapezius)

35
Q

Latissimus Dorsi Blood Supply

A

Thoracodorsal artery

36
Q

Rhomboid Major and Rhomboid Minor Origin

A

Major: spinous processes of T2-T5
Minor: spinous processes of C7 and T1 vertebrae (and Nuchal ligament)

37
Q

Rhomboid Major and Rhomboid Minor Insertion

A

Medial border of scapula

38
Q

Rhomboid Major and Rhomboid Minor Innervation

A

Dorsal scapular nerve

39
Q

Rhomboid Major and Rhomboid Minor Action

A

1) Retract scapula
2) rotate glenoid cavity inferiorly
3) Fix scapula to the thoracic wall

40
Q

Rhomboid Major and Rhomboid Minor Blood Supply

A

Dorsal scapular artery

41
Q

Levator Scapulae Origin

A

Transverse processes of C1-C4

42
Q

Levator Scapulae Insertion

A

Medial border of scapula to superior angle

43
Q

Levator Scapulae Innervation

A

Dorsal scapular nerve

44
Q

Levator Scapulae Action

A

1) Elevates scapula (assist trapezius)

2) Rotates glenoid cavity inferiorly

45
Q

Levator Scapulae Blood Supply

A

Dorsal scapular artery

Human Anatomy Fall 2017 (19 decks)

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