Muscles of Scapular Region

Question 1

Proximal—> distal attachments of the deltoid muscle

Answer 1

from clavicle, acromion & spine of the scapula TO the deltoid tuberosity of the humerus

Question 2

Actions of the deltoid

Answer 2

(anterior) - flexion and medial rotation
(middle) - abduction of humerus
(posterior) - extension, lateral rotation, horizontal extension

Question 3

What is horizontal extension?

Answer 3

Bring arms into 90 degree abducted position parallel to the ground.

bring arms forward so that palms become closer together (while maintaining arms parallel to the ground)–> horizontal flexion

bring arms back to the original position so that they are in line with the frontal plane–> horizontal extension

Question 4

Innervation of the deltoid muscles

Answer 4

axillary nerve

C5-6 anterior, middle, and posterior portions

Question 5

Proximal–> distal attachments of the supraspinatus

Answer 5

from the medial 2/3 of the supraspinous fossa–> superior facet of the greater tubercle of the humerus & the shoulder joint capsule

Question 6

Actions of supraspinatus

Answer 6

initiates humeral abduction & laterally rotates humerus; stabilizes glenohumeral joint (reinforcement of the superior aspect of joint capsule)

Question 7

Innervation of supraspinatus

Answer 7

suprascapular nerve

C4-6

Question 8

Proximal—>distal attachments of infraspinatus

Answer 8

from the medial 2/3 of the infraspinous fossa —> the middle facet of the greater tubercle of the humerus & to shoulder joint capsule

Question 9

Actions of the infraspinatus

Answer 9

lateral rotation of humerus; stabilization of glenohumeral joint

Question 10

Innervation of infraspinatus

Answer 10

suprascapular nerve

C5-6

Question 11

Proximal–>distal attachments of teres minor

Answer 11

from the upper 2/3 of the dorsal surface of the lateral border of the scapula –> the inferior facet of the greater tubercle of the humerus & to shoulder joint capsule

Question 12

Actions of the teres minor

Answer 12

lateral rotation of humerus; stabilizes GH joint

Question 13

Innervation of teres minor

Answer 13

axillary nerve

C5-6

Question 14

Proximal–> distal attachments of subscapularis

Answer 14

from the subscapular fossa —> the lesser tubercle of the humerus

Question 15

Actions of subscapularis

Answer 15

medial rotation of humerus; stabilizes GH joint

Question 16

Innervation of subscapularis

Answer 16

upper & lower subscapular nerves

C5-6

Question 17

Proximal–> distal attachments of teres major

Answer 17

from the dorsal surface of the inferior angle scapula & lower 1/3 of the lateral border of the scapula —-> medial lip of the intertubercular sulcus of the humerus

Question 18

Actions of teres major

Answer 18

humeral adduction, medial rotation, & extension

Question 19

Inn. of teres major

Answer 19

lower subscapular nerve C5-6

C5-6

Question 20

spinal cord segments of deltoid muscle

Answer 20

C5-6 (anterior, middle, and posterior portions)

Question 21

spinal cord segments of supraspinatus muscle

Answer 21

C4-6

Question 22

spinal cord segments of infraspinatus

Answer 22

C5-6

Question 23

spinal cord segments of teres minor

Answer 23

C5-6

Question 24

spinal cord segments of subscapularis

Answer 24

C5-6

Question 25

spinal cord segments of teres major

Answer 25

C5-6

Question 26

What surrounds the axillary artery, vein and cords of the brachial plexus?

Answer 26

The axillary sheath

–> a piece of fascia