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My cards > ANAT: Pectoral and Shoulder > Flashcards

ANAT: Pectoral and Shoulder Flashcards

0
Q

Bones of pectoral girdle

A

Clavicle, Scapula, Humerus

*Accessory include: Sternum, ribs, glenohumeral joint

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1
Q

Pectoral girdle

A

Bony ring formed by the scapula and the clavicle

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2
Q

Teres major m. ORIGIN

A

Posterior side of scapula, near inferior angle

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3
Q

Teres major m. INSERTION

A

medial lip of the intertubercular groove, near the insertion of the latissimus dorsi (anterior, superior part of the humeral shaft)

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4
Q

Teres major m. INNERVATION

A

lower subscapular n.

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5
Q

Teres major m. BLOOD

A

subscapular a.

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6
Q

Teres major m. ACTION

A

extension, aDduction, and medial rotation of the humerus (same actions on the humerus/glenohumeral joint as latissimus dorsi)

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7
Q

Deltoid m. ORIGIN

A

Lateral 1/3 of clavicle, acromion, and spine of scapula; similar to insertion of trapezius

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8
Q

Deltoid m. INSERTION

A

deltoid tuberosity of humerus

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9
Q

Deltoid m. INNERVATION

A

Axillary n. (also supplies skin over deltoid)

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10
Q

Deltoid m. BLOOD

A

Posterior circumflex humeral a.

- courses with the axillary n. in the quadrangular space

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11
Q

Deltoid m. ACTIONS

A

Anterior: flexes and medially rotates
Lateral: aBducts
Posterior: extends and laterally rotates

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12
Q

Synovial Bursa

A

between the greater tubercle of the humerus, the deltoid m. and the acromion
*Flat sac of synovial membrane, lubricates motion

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13
Q

Rotator cuff muscles

A

Subscapularis m.
Supraspinatus m.
Infraspinatus m.
Teres minor m.

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14
Q

Subscapularis m. ORIGIN

A

Subscapular fossa

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15
Q

Subscapularis m. INSERTION

A

lesser tubercular of the humerus

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16
Q

Subscapularis m. INNERVATION

A

upper and lower subscapular nn.

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17
Q

Subscapularis m. BLOOD

A

Subscapular a.

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18
Q

Subscapularis m. ACTION

A

medially rotates the humerus (only one!)

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19
Q

Supraspinatus m. ORIGIN

A

supraspinous fossa

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20
Q

Supraspinatus m. INSERTION

A

superior part of the greater tubercle of the humerus

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21
Q

Supraspinatus m. INNERVATION

A

suprascapular n.

-courses through the suprascapular notch and under the transverse scapular ligament

22
Q

Supraspinatus m. BLOOD

A

suprascapular a.

-courses OVER the transverse scapular ligament

23
Q

Supraspinatus m. ACTION

A

Abducts the humerus

24
Q

Infraspinatus m. ORIGIN

A

Infraspinous fossa

25
Q

Infraspinatus m. INSERTION

A

Posterior side of the greater tubercle of the humerus

26
Q

Infraspinatus m. INNERVATION

A

suprascapular n.

passes between the acromion and neck of scapula

27
Q

Infraspinatus m. BLOOD

A

circumflex scapular a.

28
Q

Infraspinatus m. ACTION

A

laterally rotates the humerus

29
Q

Teres minor m. ORIGIN

A

posterior side of the scapula, near its lateral border, lateral to the origin of teres major m.

30
Q

Teres minor m. INSERTION

A

Posterior side of the greater tubercle of the humerus, inferior to the insertion of infraspinatus m.

31
Q

Teres minor m. INNERVATION

A

axillary n.

32
Q

Teres minor m. BLOOD

A

circumflex scapular a.

33
Q

Teres minor m. ACTION

A

laterally rotates humerus

34
Q

Pectoralis major m. ORIGIN

A

medial 1/3 of clavicle

sternum and costal cartilage

35
Q

Pectoralis major m. INSERTION

A

Lateral lip of intertubercular groove (sulcus)

36
Q

Pectoralis major m. INNERVATION

A

lateral and medial pectoral nn.

37
Q

Pectoralis major m. BLOOD

A

branches of internal thoracic, lateral thoracic, and thoraco-acromial arteries

38
Q

Pectoralis major m. ACTION

A

ADduct and medially rotate the humerus
Flexes humerus
Flexes and extends humerus, but extends the flexed humerus, depresses and protracts the shoulder girdle by pulling on the humerus.

39
Q

Pectoralis minor m. ORIGIN

A

Ribs 3, 4, 5 near costochondral junction

40
Q

Pectoralis minor m. INSERTION

A

Coracoid process of scapula

41
Q

Pectoralis minor m. INNERVATION

A

medial pectoral n. (penetrates minor m. and then enters major m.)

42
Q

Pectoralis minor m. BLOOD

A

lateral thoracic and thoracoacromial aa. (branches of the axillary a.)

43
Q

Pectoralis minor m. ACTION

A

depresses and protracts the shoulder girdle, helps with inferior rotation of scapula

44
Q

Subclavius m. ORIGIN

A

first costal cartilage

45
Q

Subclavius m. INSERTION

A

inferior side of the clavicle

46
Q

Subclavius m. INNERVATION

A

Nerve to subclavius (small branch of brachial plexus)

47
Q

Subclavius m. ACTION

A

Depresses clavicle and resists lateral dislocation of the clavicle
*Clinically: can act in “splinting” a fractured clavicle, as well as play a role in the protection of nerves and arteries that run inferior to the clavicle through the axillary region

48
Q

Serratus Anterior m. ORIGIN

A

First 8-9 ribs, laterally

49
Q

Serratus anterior m. INSERTION

A

Anterior (deep) side of scapula, along entire medial border

50
Q

Serratus anterior m. INNERVATION

A

Long thoracic n.

51
Q

Serratus anterior m. BLOOD

A

Subscapular and lateral thoracic aa. (branches of axillary a) and lateral branches of the posterior intercostal aa.

52
Q

Serratus anterior m. ACTIONS

A

Protracts the shoulder girdle by pulling scapula anteriorly
Hold scapula against rib cage
Rotates scapula superiorly during abduction of the arm by pulling inferior angle anteriorly.
*Clinically: denervation of the serratus anterior m. results in “winging of the scapula” when patient tries to push anteriorly or flex glenohumeral joint

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