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Anatomy > O & I Shoulder, Posterior arm, & Pectoral Region > Flashcards

O & I Shoulder, Posterior arm, & Pectoral Region Flashcards

Serratus Ant. is in here, move it eventually

1
Q

Origin: Pectoralis Major

A

Clavicular Head: anterior surface of medial half of clavicle

Sternocostal Head: anterior surface of sternum, superior six costal cartilages, and aponeurosis of external oblique muscle

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2
Q

Insertion: Pectoralis Major

A

Lateral lip of inter tubercular sulcus of humerus

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3
Q

Innervation: Pectoralis Major

A

Lateral and medial pectoral nerves; Clavicular head (C5,C6), and Sternocostal head (C7, C8, T1)

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4
Q

Action: Pectoralis Major

A

Adducts and medially rotates humerus; draws the scapula anteriorly and inferiorly.

Acting alone, the clavicular head flexes the humerus and the sternocostal head extends the humerus from a flexed position

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5
Q

Origin: Pectoralis Minor

A

3rd - 5th ribs near their costal cartilages

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6
Q

Insertion: Pectoralis Minor

A

Medial boarder and superior surface of coracoid process of scapula

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7
Q

Innervation: Pectoralis Minor

A

Medial Pectoral Nerve (C8, T1)

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8
Q

Action: Pectoralis Minor

A

Stabilizes the scapula by drawing it inferiorly and anteriorly against thoracic wall

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9
Q

Origin: Subclavius

A

Junction of 1st rib and its costal cartilage

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10
Q

Insertion: Subclavius

A

Inferior surface of middle third of clavicle

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11
Q

Innervation: Subclavius

A

Nerve to subclavius (C5,C6)

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12
Q

Action: Subclavius

A

Anchors and depresses clavicle

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13
Q

Origin: Serratus Anterior

A

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

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14
Q

Insertion: Serratus Anterior

A

Anterior surface of medial border of scapula

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15
Q

Innervation: Serratus Anterior

A

Long Thoracic Nerve (C5, C6, C7)

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16
Q

Action: Serratus Anterior

A

Protracts the scapula and holds it against thoracic wall; rotates scapula

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17
Q

Origin: Deltoid

A

Lateral 1/3 of clavicle; acrominon and spine of scapula

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18
Q

Insertion: Deltoid

A

Deltoid tuberosity of humerus

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19
Q

Innervation: Deltoid

A

Axillary nerve (C5, C6)

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20
Q

Action: Deltoid

A

Clavicular (anterior) part: flexes & medially (internally) rotates arm

Acromial (medial) part: abducts arm

Spinal (posterior) part: extends & laterally (externally) rotates arm

21
Q

Origin: Teres Major

A

Posterior surface of inferior angle of the scapula

22
Q

Insertion: Teres Major

A

Medial lip of inter tubercular sulcus of humerus

23
Q

Innervation: Teres Major

A

Lower Subscapular nerve (C5, C6)

24
Q

Action: Teres Major

A

Adducts & medially (internally) rotates arm

25
Q

Origin: Subscapularis

A

Subscapular fossa (most of the anterior surface of the scapula)

26
Q

Insertion: Subscapularis

A

Lesser tubercle of humerus

27
Q

Innervation: Subscapularis

A

Upper and lower subscapular nerves (C5, C6, C7)

28
Q

Action: Subscapularis

A

Medially rotates arm

As part of rotator cuff, helps hold head of humerus in glenoid cavity

29
Q

Origin: Supraspinatus

A

Supraspinous fossa of scapula

30
Q

Insertion: Supraspinatus

A

Superior facet of greater tubercle of humerus

31
Q

Innervation: Supraspinatus

A

Suprascapular nerve (C4, C5, C6)

32
Q

Action: Supraspinatus

A

Initiates and assist deltoid /c abduction of arm

Acts /c rotator cuff muscles to help hold head of humerus in glenoid cavity

33
Q

Origin: Infraspinatus

A

Infraspinous fossa of scapula

34
Q

Insertion: Infraspinatus

A

Middle facet of greater tubercle of humerus

35
Q

Innervation: Infraspinatus

A

Suprascapular Nerve (C5, C6)

36
Q

Action: Infraspinatus

A

Laterally rotates arm

Acts /c other rotator cuff muscles to help hold head of humerus in glenoid cavity

37
Q

Origin: Teres Minor

A

Middle part of lateral border of scapula

38
Q

Insertion: Teres Minor

A

Inferior facet of greater tubercle of humerus

39
Q

Innervation: Teres Minor

A

Axillary nerve (C5, C6)

40
Q

Action: Teres Minor

A

Laterally rotates arm

Acts /c other rotator cuff muscles to help hold head of humerus in glenoid cavity

41
Q

Origin: Triceps Brachii

A

Long Head: infraglenoid tubercle of scapula

Lateral Head: posterior surface of humerus, superior to radial groove

Medial Head: posterior surface of humerus, inferior to radial groove

42
Q

Insertion: Triceps Brachii

A

Proximal end of olecranon of ulna and fascia of forearm

43
Q

Innervation: Triceps Brachii

A

radial nerve (C6, C7, C8)

44
Q

Action: Triceps Brachii

A

Chief extensor of forearm; long head resists dislocation of humerus; especially important during adduction

45
Q

Origin: Platysma

A

Subcutaneous tissue of infraclavicular and supraclavicular regions

46
Q

Insertion: Platysma

A

Base of mandible; skin of cheek and lower lip; angle of mouth (modiolus); orbicularis oris

47
Q

Innervation: Platysma

A

Cervical branch of the facial n. (CN VII)

48
Q

Action: Platysma

A

Depresses mandible (against resistance); tenses skin of inferior face and neck (conveying tension and stress)

Anatomy (25 decks)

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