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PT 6015 Gross Anatomy > Dorsal Scapular Region Muscles > Flashcards

Dorsal Scapular Region Muscles Flashcards

1
Q

Purposeful Activity of Deltoids

A

Reaching arms overhead

Reaching for (anterior) and putting on (posterior) a seatbelt

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2
Q

Insertion of Deltoid

A

Deltoid tuberosity of humerus

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3
Q

Origin of Deltoid

A

Spine of scapula
Acromion
Clavicle

Same as trapezius insertions

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4
Q

Nerve innervation of Deltoid

A

Axillary nerve
C5, C6

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5
Q

Action of Deltoid

A

Anterior/Clavicular = arm FLEXION and HELPS WITH INTERNAL ROTATION

Lateral/Acromial = arm ABDUCTION

Posterior/Spinal = arm EXTENSION and HELPS WITH EXTERNAL ROTATION

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6
Q

Purposeful activity of Pectoralis Major

A

Reaching across the body into overhead cabinet

Putting on seatbelt

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7
Q

Origin of Pectoralis Major

A

Clavicular Head - Clavicle

Sternocostal Head -
-Sternum
-Costal cartilages 1-6
-External oblique muscle

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8
Q

Insertion of Pectoralis Major

A

LATERAL LIP of intertubercular sulcus of humerus

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9
Q

Nerve innervation of Pectoralis Major

A

Lateral and medial pectoral nerves:

Clavicular head: C5, C6

Sternocostal head: C7, C8, T1

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10
Q

Actions of Pectoralis Major

A

Humerus: ADDUCTION and INTERNAL/MEDIAL ROTATION

Scapula: PROTRACTION (draws scapula anteriorly and inferiorly)

Arm: HORIZONTAL ADDUCTION

Acting alone:
Clavicular head: Humerus/arm FLEXION
Sternocostal head: Humerus/arm EXTENSION from flexed position

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11
Q

Purposeful activity of Pectoralis Minor

A

Taking deep breath, walking with crutches

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12
Q

Origin of Pectoralis Minor

A

Ribs 3-5 near costal cartilages

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13
Q

Insertion of Pectoralis Minor

A

Coracoid Process

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14
Q

Nerve Innervation of Pectoralis Minor

A

Medial pectoral nerve: C8, T1

Lateral pectoral nerve: variable

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15
Q

Actin of Pectoralis Minor

A

Scapular PROTRACTION
-stablizes scap by drawing it inferiorly and anteriorly

While scapula fixed, ASSISTS TO ELEVATE thorax during forced inhalation

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16
Q

Purposeful activity of Teres Major

A

Toileting, perineal care

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17
Q

Origin of Teres Major

A

Posterior surface of scapula’s inferior angle

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18
Q

Insertion of Teres Major

A

MEDIAL LIP of intertubercular sulcus of humerus

Next to latissimus and pectoralis major! Lady b/w two majors!

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19
Q

Nerve innervation of Teres Major

A

Lower subscapular nerve
C5, C6

20
Q

Actions of Teres Major

A

Shoulder ADDUCTION and INTERNAL ROTATION

21
Q

Purposeful Activity Supraspinatus

A

Washing your hair

22
Q

Origin of Supraspinatus

A

Supraspinous fossa

23
Q

Insertion of Supraspinatus

A

Greater Tubercle of Humerus

24
Q

Nerve innervation of Supraspinatus

A

Suprascapular nerve
C4, C5, C6

25
Q

Action of Supraspinatus

A

Stabilizes head of humerus in glenoid cavity
INITIATES and ASSISTS deltoid in ABDUCTION

26
Q

Purposeful activity of Infraspinatus

A

Playing racket sports or table tennis

27
Q

Origin of Infraspinatus

A

Infraspinous fossa

28
Q

Insertion of Infraspinatus

A

Greater tubercle of humerus

29
Q

Nerve innervation of Infraspinatus

A

Suprascapular nerve
C5, C6

30
Q

Action of Infraspinatus

A

Stabilizes head of humerus in glenoid cavity
Shoulder EXTERNAL ROTATION

31
Q

Purposeful activity of Teres Minor

A

Washing back of your head and neck

32
Q

Origin of Teres Minor

A

Lateral border of scapula

33
Q

Insertion of Teres minor

A

Greater tubercle of humerus

34
Q

Nerve Innervation of Teres minor

A

Axillary nerve
C5, C6

35
Q

Action of Teres minor

A

Stabilizes head of humerus in glenoid cavity
Shoulder EXTERNAL ROTATION

36
Q

Purposeful activity of Subscapularis

A

Toileting, donning a bra, throwing a baseball

37
Q

Origin of Subscapularis

A

Subscapular fossa (most of scapula’s anterior surface)

38
Q

Insertion of Subscapularis

A

Lesser tubercle of humerus

39
Q

Nerve innervation of Subscapularis

A

Upper and lower subscapular nerves
C5, C6, C7

40
Q

Action of Subscapularis

A

Stabilize head of humerus in glenoid cavity
Shoulder INTERNAL ROTATION

41
Q

Purposeful activity of Serratus Anterior

A

Pushing open a heavy door, punching

42
Q

Origin of Serratus Anterior

A

Lateral part of ribs 1-8 or 1-9

43
Q

Insertion of Serratus Anterior

A

Medial Border of Scapula

44
Q

Nerve innervation of Serratus Anterior

A

Long Thoracic Nerve
C5, C6, C7

45
Q

Action of Serratus Anterior

A

Scapular PROTRACTION and UPWARD ROTATION
HOLDS scapula against thoracic wall

PT 6015 Gross Anatomy (5 decks)

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