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MSK Exam II > Scapular And Deltoid Regions > Flashcards

Scapular And Deltoid Regions Flashcards

1
Q

What are the superficial muscles associated with the scapular region?

A

Trapezius

Latissimus dorsi

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2
Q

The trapezius m. acts to retract the scapula; superior fibers pull upward on a lateral angle and inferior fibers pull downward on the base of the spine, rotating the glenoid cavity upward; this motion typically accompanies what motion of the arm?

A

Abduction

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3
Q

What muscle’s inferior fibers prevent upward displacement of the shoulder when weight of the body tends to produce this action, such as with hanging by the arms or using crutches?

A

Latissimus dorsi

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4
Q

What are the deep extrinsic muscles assoociated with the scapular region?

A

Levator scapulae
Rhomboideus minor
Rhomboideus major
Serratus anterior

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5
Q

If, during protraction of the scapula, the inferior angle moves forward faster than the remainder of the medial border, the scapula is upwardly rotated. This upward rotation is the most important action of which of the following muscles?

A. Levator scapulae m.
B. Serratus anterior m.
C. Rhomboideus major m.
D. Rhomboideus minor m.
E. Deltoid m.
A

B. Serratus anterior m.

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6
Q

The serratus anterior is normally aided by fibers of the _____ muscle that lifts the lateral angle of the scapula

A

Trapezius

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7
Q

Origin of deltoid m.

A

Lateral 1/3 of clavicle, acromion and spine of scapula

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8
Q

The deltoid originates on the lateral 1/3 of the clavicle, acromion, and spine of scapula. This is the same as the insertion point of what muscle?

A

Trapezius m.

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9
Q

Insertion of deltoid

A

Deltoid tuberosity on body of humerus

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10
Q

Innervation of deltoid m.

A

Axillary n. (C5-6)

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11
Q

Actions of deltoid m.

A

Anterior fibers flex and medially rotate arm

Middle fibers abduct arm

Posterior fibers extend and laterally rotate arm

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12
Q

T/F The deltoid probably does not participate in rotation when only rotation is desired

A

True

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13
Q

Origin of supraspinatus

A

Supraspinatus fossa and from fascia covering this muscle

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14
Q

Insertion of supraspinatus

A

Uppermost of the 3 facets of greater tubercle of humerus

[tendon of insertion forms uppermost part of rotator cuff]

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15
Q

Origin of infraspinatus

A

Infraspinatus fossa and from the fascia covering the same muscle

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16
Q

Insertion of infraspinatus

A

Middle facet on greater tubercle of humerus; forms middle part of rotator cuff

17
Q

Origin of teres minor m.

A

Middle 1/2 of lateral border of scapula

18
Q

Insertion of teres minor

A

Lowest facet on greater tubercle of humerus; forms lowest part of rotator cuff

19
Q

Origin of teres major

A

Lower 1/3 of lateral border of scapula

20
Q

Origin of subscapularis m.

A

Costal surface of scapula

21
Q

Insertion of subscapularis

A

Lesser tubercle of humerus and its crest; forms anterior part of rotator cuff

22
Q

Origin/insertion/innervation action of:

Supraspinatus m.

A

Origin: supraspinatus fossa and from fascia covering the same muscle

Insertion: uppermost of 3 facets of greater tubercle of humerus

Innervation: suprascapular n. (C5-6)

Actions: abduction of arm

23
Q

Origin/insertion/innervation action of:

Infraspinatus m.

A

Origin: infraspinatus fossa and from fascia covering the same muscle

Insertion: middle facet on greater tubercle of humerus

Innervation: suprascapular n.

Actions: lateral rotation of arm

24
Q

Origin/insertion/innervation action of:

Teres minor m.

A

Origin: middle 1/2 of lateral border of scapula

Insertion: lowest facet on greater tubercle of the humerus

Innervation: axillary n.

Actions: lateral rotation of arm; also a weak adductor of the arm

25
Q

Origin/insertion/innervation action of:

Teres major m.

A

Origin: lower third of lateral border of scapula

Insertion: passes around medial side of humerus with latissimus dorsi to attach to the crest of the lesser tubercle of the humerus

Innervation: lower subscapular n. (C5-6)

Actions: adduction, medial rotation and extension of arm; apparently only acts when these movements are resisted

26
Q

Origin/insertion/innervation action of:

Subscapularis m.

A

Origin: costal surface of scapula

Insertion: tendon passes across front of shoulder joint, forming anterior part of rotator cuff, to insert into the lesser tubercle of humerus and its crest

Innervation: upper and lower subscapular n.

Actions: medial rotation of arm

27
Q

What are the 4 borders of the quadrangular space?

A

Superior border: lateral border of scapula and capsule of shoulder joint

Lateral border: surgical neck of humerus

Inferior border: teres major m.

Medial border: long head of triceps brachii

28
Q

What are the contents of the quadrangular space

A

Axillar n.

Posterior humeral circumflex a. and v.

29
Q

What branch of the thyrocervical trunk supplies the levator scapulae, trapezius, and rhomboidei mm?

A

Transverse cervical a.

30
Q

What branch of the thyrocervical trunk supplies the supraspinatus and infraspinatus

A

Suprascapular a.

31
Q

What 2 arteries does the suprascapular a. anastomose with?

A

Deep branch of transverse cervical a.

Circumflex scapular branch of subscapular a.

32
Q

What branch of the thoracoacromial trunk supplies the deltoid m.?

A

Deltoid branch

33
Q

What artery arising the axilla supplies the serratus anterior m.?

A

Lateral thoracic a.

34
Q

What are the 2 branches of the subscapular a.?

A

Thoracodorsal a.

Circumflex scapular a.

35
Q

The subscapular a. has 2 branches: the thoracodorsal a. and the circumflex scapular a. What does the thoracodorsal a. supply?

A

Subscapularis m.
Teres major m.
Latissimus dorsi m.
Serratus anterior m.

36
Q

The subscapular a. has 2 branches: the thoracodorsal a. and the circumflex scapular a. What does the circumflex scapular a. supply?

A

Infraspinatus m.

37
Q

The subscapular a. has 2 branches: the thoracodorsal a. and the circumflex scapular a. What does the circumflex scapular a. anastomose with?

A

Suprascapular a.

38
Q

What does the posterior humeral circumflex a. supply and anastomose with?

A

Supplies deltoid m.

Anastomoses with anterior humeral circumflex a.

39
Q

Deep lymphatic vessels of the shoulder follow the blood vessels and therefore drain largely into the _______ lymph nodes

A

Axillary

MSK Exam II (20 decks)

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