KIN 100 - Scapulohumeral Muscles (lecture 6)

Question 1

What does scapulohumeral muslces attach

Answer 1

the humerus to the scapula

Question 2

What do scapulohumeral muscles act on and where does it cause movement

Answer 2

acts on glenohumeral joint and cause movement of the shoulder

Question 3

What are the four scapulohumeral muscles are considered rotator cuff muscles

Answer 3

1. Supraspinatus
2. Infraspinatus
3. Teres minor
4. Subscapularis

Question 4

What scapulohumeral muscles are not rotator cuffs? (2)

Answer 4

1. Deltoid
2. Teres major

Question 5

Deltoid

Answer 5

proximal attachment: lateral clavicle, acromion, spine of scapula

distal attachment: Deltoid tuberosity

Innervation: axillary nerve

Action: shoulder abduction and adduction, shoulder extension and flexion, shouler internal and external rotation

Question 6

Teres major

Answer 6

proximal attachment: inferior angle and inferior portion of the lateral border of scapula

distal attachment: medial lip of bicipital groove

Innervation: lower subscapular nerve

Action: Shoulder adduction, shoulder extension, shoulder medial rotation

Question 7

What muscle does teres major share actions with

Answer 7

latissimus dorsi

Question 8

What do the rotator cuff collectively do

Answer 8

reinforce fibrous joint capsule of the glenohumeral joint , stabilizing the joint

Question 9

Supraspinatus

Answer 9

proximal attachment: supraspinous fossa

Distal attachment: Greater tubercle of humerus

Innervation: suprascapular nerve

Action: first 15 degrees of abduction

Question 10

What is the first muscle to intiate abduction

Answer 10

supraspinatus,
deltoid does the rest

Question 11

Infraspinatus

Answer 11

proximal attachment: infraspinous fossa

Distal attachment: Greater tubercle of humerus

Innervation: suprascapular nerve

Action: Shoulder lateral rotation

Question 12

Teres minor

Answer 12

proximal attachment: lateral border of the scapula

distal attachment: greater tubercle of the humerus

Innervation: Axillary nerve

Action: external/shoulder rotation

Question 13

Name two muscles that both have external/lateral shoulder rotation

Answer 13

Infraspinatus and Teres minor

Question 14

Subscapularis

Answer 14

proximal attachment: subscapular fossa

Distal attachment: lesser tubercle of humerus

Innervation: upper and lower subscapular nerve

Action: internal/medial rotation

Question 15

What rotator cuff muscles are responsible for external/lateral shoulder rotation

Answer 15

infraspinatus and teres minor

Question 16

What scapulohumeral muscles are responsible for internal/medial shoulder rotation

Answer 16

Subscapularis and teres major