Scapular And Deltoid Regions

Question 1

What are the superficial muscles associated with the scapular region?

Answer 1

Trapezius

Latissimus dorsi

Question 2

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?

Answer 2

Abduction

Question 3

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?

Answer 3

Latissimus dorsi

Question 4

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

Answer 4

Levator scapulae
Rhomboideus minor
Rhomboideus major
Serratus anterior

Question 5

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.

Answer 5

B. Serratus anterior m.

Question 6

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

Answer 6

Trapezius

Question 7

Origin of deltoid m.

Answer 7

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

Question 8

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?

Answer 8

Trapezius m.

Question 9

Insertion of deltoid

Answer 9

Deltoid tuberosity on body of humerus

Question 10

Innervation of deltoid m.

Answer 10

Axillary n. (C5-6)

Question 11

Actions of deltoid m.

Answer 11

Anterior fibers flex and medially rotate arm

Middle fibers abduct arm

Posterior fibers extend and laterally rotate arm

Question 12

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

Answer 12

True

Question 13

Origin of supraspinatus

Answer 13

Supraspinatus fossa and from fascia covering this muscle

Question 14

Insertion of supraspinatus

Answer 14

Uppermost of the 3 facets of greater tubercle of humerus

[tendon of insertion forms uppermost part of rotator cuff]

Question 15

Origin of infraspinatus

Answer 15

Infraspinatus fossa and from the fascia covering the same muscle

Question 16

Insertion of infraspinatus

Answer 16

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

Question 17

Origin of teres minor m.

Answer 17

Middle 1/2 of lateral border of scapula

Question 18

Insertion of teres minor

Answer 18

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

Question 19

Origin of teres major

Answer 19

Lower 1/3 of lateral border of scapula

Question 20

Origin of subscapularis m.

Answer 20

Costal surface of scapula

Question 21

Insertion of subscapularis

Answer 21

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

Question 22

Origin/insertion/innervation action of:

Supraspinatus m.

Answer 22

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

Question 23

Origin/insertion/innervation action of:

Infraspinatus m.

Answer 23

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

Question 24

Origin/insertion/innervation action of:

Teres minor m.

Answer 24

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

Question 25

Origin/insertion/innervation action of: Teres major m.

Answer 25

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

Question 26

Origin/insertion/innervation action of: Subscapularis m.

Answer 26

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

Question 27

What are the 4 borders of the quadrangular space?

Answer 27

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

Question 28

What are the contents of the quadrangular space

Answer 28

Axillar n. Posterior humeral circumflex a. and v.

Question 29

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

Answer 29

Transverse cervical a.

Question 30

What branch of the thyrocervical trunk supplies the supraspinatus and infraspinatus

Answer 30

Suprascapular a.

Question 31

What 2 arteries does the suprascapular a. anastomose with?

Answer 31

Deep branch of transverse cervical a. Circumflex scapular branch of subscapular a.

Question 32

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

Answer 32

Deltoid branch

Question 33

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

Answer 33

Lateral thoracic a.

Question 34

What are the 2 branches of the subscapular a.?

Answer 34

Thoracodorsal a. Circumflex scapular a.

Question 35

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

Answer 35

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

Question 36

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

Answer 36

Infraspinatus m.

Question 37

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

Answer 37

Suprascapular a.

Question 38

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

Answer 38

Supplies deltoid m. Anastomoses with anterior humeral circumflex a.

Question 39

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

Answer 39

Axillary