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MSK - Anatomy > Pectoral and Shoulder Region > Flashcards

Pectoral and Shoulder Region Flashcards

1
Q

What are the superficial extrinsic muscles of the shoulder?

A

Trapezius and latissimus dorsi

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2
Q

What is the origin and attachments of the trapezius?

A

Origin - skull, muchal ligament and spinous process of C7-T12
Attaches to clavicle, acromion and scapula spine

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3
Q

What is the action of the trapezius muscle?

A

Upper fibres - elevate scapula and rotate it during abduction
Middle fibres - retract scapula
Lower fibres - pulls scapula inferiorly

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4
Q

What is the origin and attachment of the latissimus dorsi?

A

Origins - spinous process of T7-12, iliac crest, thoracolumbar fascia and scapular spine
Attachment - intertubercular sulcus of the humerus

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5
Q

What is the action of the latissimus dorsi?

A

Extension, adduction and medial rotation

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6
Q

What are the deep intrinsic muscles of the shoulder?

A

Levator scapula
Rhomboid major and minor

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7
Q

What is the attachment of the levator scapula and rhomboid major + minor?

A

Medial border of the scapula

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8
Q

What is the action of the rhomboids on the shoulder?

A

Retracts and rotates scapula

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9
Q

What are the origins and insertions of the deltoid?

A

Origin - spine of scapula, lateral 1/3 of clavicle and acromion
Insertion - deltoid tuberosity of the humerus

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10
Q

What is the origin and attachment of the teres major?

A

Origin - posterior surface of inferior angle of scapula
Insertion - medial lip of intertubercular groove of humerus

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11
Q

What are the actions of the deltoid muscle?

A

Anterior fibres - flex and medially rotate
Posterior fibres - extend and laterally rotate
Medial fibres - main adductor of arm

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12
Q

What is the action of the teres major?

A

Adduction, extension and medial rotation

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13
Q

What is the innervation of the teres major?

A

Lower subscapular nerve

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14
Q

What are the rotator cuff muscles?

A

Suprascapular, infraspinatus, subscapularis and teres minor

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15
Q

What is the insertions of the rotator cuff muscles?

A

Supraspinatus, infraspinatus and teres minor - greater tubercle of the humerus
Subscapularis - lesser tubercle of humerus

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16
Q

What is the action of the supraspinatus?

A

Abduction of UL
Performs the 0-15 degrees of abduction and assists with the deltoid until 90 degrees

17
Q

What is the action of the infraspinatus?

A

Laterally rotates the arm

18
Q

What is the action of the subscapularis?

A

Medially rotates the arm

19
Q

What is the action of the teres minor?

A

Laterally rotates the arm

20
Q

What is the innervation of the teres minor?

A

Axillary nerve

21
Q

What is the innervation of the subscapularis and infraspinatus?

A

Suprascapular nerves

22
Q

What is the origin and insertion of the pectoralis major?

A

Origin - anterior surface of medial clavicle , sternum, superior 6 costal cartilages and aponeurosis of external oblique muscle
Insertion - intertubercular sulcus of the humerus

23
Q

What is the origin and insertion of the pectoralis minor?

A

Origin - 3-5th rib
Insertion - coracoid process of scapula

24
Q

What is the origin and insertion of serratus anterior?

A

Origins - lateral ribs 1-8
Insertion - costal surface of medial border of scapula

25
Q

What is the action of the pectoralis major?

A

Adducts and medially rotates UL and draws scapula anterior + inferiorly

26
Q

What is the action of the pectoralis minor?

A

Stabilises the scapula

27
Q

What is the action of the serratus anterior?

A

Holds scapula against rib cage and rotates scapula for upward movement

28
Q

What muscles are involved in extension of the shoulder joint?

A

Latissimus dorsi, deltoid and teres major

29
Q

What muscles are involved in flexion of the shoulder joint?

A

Pectoralis major, anterior deltoid and coracobrachialis
Weak flexion from biceps brachii

30
Q

What muscles are involved in adduction of the shoulder joint?

A

Pectoralis major, latissimus dorsi and teres major

31
Q

What muscles are involved in abduction of the shoulder joint?

A

First 15 degrees - supraspinatus
15-90 degrees - deltoid
After 90 degrees - trapezius and serratus anterior

32
Q

What muscles are involved in internal rotation of the shoulder joint?

A

Subscapularis, teres major, pectoralis major, latissimus dorsi and anterior deltoid

33
Q

What muscles are involved in external rotation of the shoulder joint?

A

Infraspinatus and teres minor

MSK - Anatomy (11 decks)

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