Scapulohumeral Muscles

Question 0

deltoid origin

Answer 0

lateral third of clavicle, acromion and spine of scapula

Question 1

What are the scapulohumeral muscles

Answer 1

deltoid
teres major
supraspinatus
infraspinatus
subscapularis
teres minor

Question 2

deltoid insertion

Answer 2

deltoid tuberosity of humerus

Question 3

deltoid innervation

Answer 3

axillary nerve

c5, c6

Question 4

deltoid main actions

Answer 4

clavicular (anterior) part flexes and medially rotates shouder join
acromial (middle) part abducts shoulder joint
spinal (posterior) part extends and laterally rotates shoulder joint

Question 5

supraspinatus origin

Answer 5

supraspinous fossa of scapula

Question 6

supraspinatus insertion

Answer 6

superior facet of greater tubercle of humerus

Question 7

supraspinatus innervation

Answer 7

suprascapular nerve

C4, C5, C6

Question 8

supraspinatus action

Answer 8

initiates and assists deltoid in abduction of shoulder joint and acts with other rotator cuff muscles

Question 9

infraspinatus origin

Answer 9

infraspinous fossa of scapula

Question 10

infraspinatus insertion

Answer 10

middle facet of greater tubercle of humerus

Question 11

infraspinatus innervatin

Answer 11

suprascapular nerve

c5 c6

Question 12

infraspinatus action

Answer 12

lateraly rotate shoulder joint, help hold humeral head in glenod cavity of scapula

Question 13

teres minor origin

Answer 13

middle part of lateral border of scapula

Question 14

teres minor insertion

Answer 14

inferior facet of greater tubercle of humerus

Question 15

teres minor innervation

Answer 15

axillary nerve

c5, c6

Question 16

teres minor action

Answer 16

laterally rotate shoulder joint, help hold humeral head in glenoid cavity of scapula

Question 17

teres major origin

Answer 17

inferior part of lateral border of scapula and posterior surface of inferior angle of scapula

Question 18

teres major insertion

Answer 18

medial lip of intertubercular sulcus of humerus

Question 19

teres major innervation

Answer 19

lower subscapular nerve

c5 c6

Question 20

teres major action

Answer 20

adducts and medially rotates shoulder joint

Question 21

subscapularis origin

Answer 21

subscapular fossa (most of anterior surface of scapula)

Question 22

subscapularis insertion

Answer 22

lesser tubercle of humerus

Question 23

subscapularis innervation

Answer 23

upper and lower subscapular nerves

c5, c6, c7

Question 24

subscapularis action

Answer 24

medially rotates and adducts shoulder joint

helps hold humeral head in glenoid cavity

Question 25

rotator cuff muscles

Answer 25

supraspinatus, infraspinatus, teres minor, subscapularis
form a musculotendinous rotator cuff around glenohumeral joint
all except supraspinatus are rotators of te humerus
tonic contraction holds humerus firmly against glenoid cavity

Question 26

Quadrangular region

Answer 26

Inferior border of teres minor
Superior border f teres major
Lateral border of long head of triceps brachii
Humerus
Contains axillary nerve, and posterior circumflex humeral artery

Question 27

Median triangle

Answer 27

Superior border of teres major
Inferior border of teres minor
Medial border of long head of triceps brachii
Contains circumflex scapular artery

Question 28

Triceps hiatus

Answer 28

Inferior border of teres major
Lateral border of long head of triceps brachii
Humerus
Contains profunda brachii (deep brachial) artery and radial nerve