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Gross Anatomy - Unit 2 > Ant. Axio-Appendicular and Scapulohumeral muscles > Flashcards

Ant. Axio-Appendicular and Scapulohumeral muscles Flashcards

0
Q

Insertion of pectoralis major

A

Lateral lip of intertubercular sulcus (groove) of humerus

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1
Q

Origin of pectoralis major

A

Clavicular head: anterior surface of medial half of clavicle

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

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2
Q

Innervation of pectoralis major

A 
Lateral and medial pectoral nerves
Clavicular head (C5 and C6)
Sternocostal head (C7, C8, T1)
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3
Q

Main actions of pectoralis major

A

Adducts and medially rotates shoulder joint
Draws scapula anteriorly and inferiorly
Alone : clavicular head flexes shoulder joint and sternocostal head extends it from the flexed position

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4
Q

Origin of pectoralis minor

A

3rd-5th ribs near their costal cartilages

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5
Q

Insertion of pectoralis minor

A

Medial border and superior surface of coracoid process of scapula

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6
Q

Innervation of pectoralis minor

A

Medial pectoral nerve (C8, T1)

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7
Q

Action of pectoralis minor

A

Stabilizes scapula by drawing inferiorly and anteriorly against thoracic wall

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8
Q

Origin of subclavius

A

Junction of 1st rib and its costal cartilage

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9
Q

Insertion of subclavius

A

Inferior surface of middle third of clavicle

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10
Q

Innervation of subclavius

A

Subclavian nerve (C5, C6)

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11
Q

Action of subclavius

A

Anchors and depresses clavicle

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12
Q

Origin of serratus anterior

A

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

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13
Q

Insertion of serratus anterior

A

Anterior surface of medial border of scapula

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14
Q

Innervation of serratus anterior

A

Long thoracic nerve (C5, C6, C7)

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15
Q

Action of serratus anterior

A

Protracts scapula and holds against thoracic wall; rotates scapula

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16
Q

Origin of deltoids

A

Lateral third of clavicle

Acromion and spine of scapula

17
Q

Insertion of deltoids

A

Deltoid tuberosity of humerus

18
Q

Innervation of deltoid

A

Axillary nerve (C5, C6)

19
Q

Action of deltoid

A

Clavicular part flexes and medially rotates shoulder joint
Acromial part abducts shoulder joint
Spinal part extends and laterally rotates shoulder joint

20
Q

Origin of supraspinatus

A

Supraspinous fossa of scapula

21
Q

Insertion of supraspinous

A

Superior facet of greater tubercle of humerus

22
Q

Innervation of supraspinatus

A

Suprascapular nerve (C4, C5, C6)

23
Q

Action of supraspinatus

A

Initiates and assists deltoid in abduction of shoulder joint and acts with other rotator cuff muscles

24
Q

Origin of infraspinatus

A

Infraspinous fossa of scapula

25
Q

Insertion of infraspinatus

A

Middle facet of greater tubercle of humerus

26
Q

Innervation of infraspinatus

A

Suprascapular nerve (C5, C6)

27
Q

Action of infraspinatus

A

Laterally rotate shoulder joint

Help hold humeral head in glenoid cavity of scapula

28
Q

Origin of teres minor

A

Middle part of lateral border of scapula

29
Q

Insertion of teres minor

A

Inferior facet of greater tubercle of humerus

30
Q

Innervation of teres minor

A

Axillary nerve (C5, C6)

31
Q

Action of teres minor

A

Laterally rotate shoulder joint

Help hold humeral head in glenoid cavity of scapula

32
Q

Origin of teres major

A

Inferior part of lateral border of scapula and posterior surface of inferior angle of scapula

33
Q

Insertion of teres major

A

Medial lip of intertubercular sulcus of humerus

34
Q

Innervation of teres major

A

Lower subscapular nerve (C5, C6)

35
Q

Action of teres major

A

Adducts and medially rotates shoulder joint

36
Q

Origin of subscapularis

A

Subscapular fossa (most of anterior surface of scapula)

37
Q

Insertion of subscapularis

A

Lesser tubercle of humerus

38
Q

Innervation of subscapularis

A

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

39
Q

Action of subscapularis

A

Medially rotates and adducts shoulder joint

Helps hold humeral head in glenoid cavity

Gross Anatomy - Unit 2 (11 decks)

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