shoulder muscles

Question 1

serratus anterior

Answer 1

o: 1st to 9th ribs
i: anterior aspect of medial border of scapula
in: long thoracic nerve
action: scapular protraction, lateral rotation
position: supine

Question 2

subscapularis

Answer 2

o: subscapularis fossa (under the scapula)
i: lesser tuberosity of humerus
in: upper and lower subscapular nerves
action: medial rotation of the GJ (shoulder)
position: supine

Question 3

latissimus dorsi

Answer 3

o: spinous processes of T7 to L5, posterior iliac crest, sacrum
i: bicipital groove
in: thoracodorsal nerve
action: shoulder extension, adduction and medial rotation
position: sitting

Question 4

deltoids

Answer 4

o: lateral clavicle, acromion, spine of scapula
i: deltoid tuberosity (on humerus)
in: axillary nerve
action: shoulder flexion, extension, abduction, medial and lateral rotation
position: sitting

Question 5

infraspinatus

Answer 5

o: infraspinatus fossa on scapula
i: greater tuberosity of humerus
in: suprascapula nerve
action: lateral rotation of GJ
position: prone

Question 6

supraspinatus

Answer 6

o: supraspinatus fossa of scapula
i: greater tuberosity of humerus
in: suprascapular nerve
action: shoulder abduction
position: prone

Question 7

teres major

Answer 7

o: inferior two-thirds of lateral border of scapula
i: bicipital groove
in: lower subscapular nerve
action: medial rotation of shoulder, shoulder extension, adduction
position: prone

Question 8

teres minor

Answer 8

o: superior one0third of lateral border of scapula
i: greater tuberosity of humerus
in: axillary nerve
action: lateral rotation of humerus
position: prone

Question 9

pectoralis major

Answer 9

o: sternum, clavicle, costal cartilages 1 to 7
i: bicipital groove
in: lateral and medial pectoral nerves
action: adduction, medial rotation, flexion, extension, scapula protraction
position: supine

Question 10

levator scapulae

Answer 10

o: transverse processes of C1 to C4
i: superior angle of scapula
in: dorsal scapular nerve
action: scapular elevation, medial rotation, neck extension, lateral flexion, rotation
position: sitting

Question 11

trapezius

Answer 11

o: occiput, nuchal ligament, spinous processes of C7 to T12
i: lateral clavicle, acromion, spine of scapula
in: spinal accessory nerve
action: scapula elevation, depression, retraction, protraction, rotation. Cervical extension, lateral flexion contralateral rotation
position: sitting