Scapulohumeral (intrinsic Shoulder) Muscles

Question 0

Insertion of deltoid

Answer 0

Deltoid tuberosity

Question 1

Deltoid origin

Answer 1

Lateral third of clavicle
Acromion
Spine of scapula

Question 2

Deltoid Innervation

Answer 2

Axillary nerve C5 C6

Question 3

Deltoid actions

Answer 3

Clavicular (anteriorly) part flexes and medially rotates shoulder joint
Acromial (middle) part abducts shoulder joint
Spine (posterior) part extends and laterally rotates

Question 4

Supraspinous origin

Answer 4

Supraspinous fossa of scapula

Question 5

Insertion of supraspinous

Answer 5

Superior facet of greater tubercle of humerus

Question 6

Innervation of supraspinatus

Answer 6

Suprascapular nerve C4 C5 C6

Question 7

Supraspinatus action

Answer 7

Initiates and assist deltoid in abduction Of shoulder joint

Acts with other rotator cuff muscles

Question 8

Infraspinatus origin

Answer 8

infraspinous fossa of scapula

Question 9

Infraspinatus insertion

Answer 9

Middle facet of greater tubercle of humerus

Question 10

Infraspinatus Innervation

Answer 10

Suprascapular C5 C6

Question 11

Action of Infraspinatus and teres minor

Answer 11

Laterally rotates shoulder joint

Helps hold humerus head in glenoid cavity of scapula

Question 12

Teres minor origin

Answer 12

Middle part of lateral border of scapula

Question 13

Teres minor insertion

Answer 13

Inferior facet of greater tubercle of humerus

Question 14

Innervation of teres minor

Answer 14

Axillary nerve C5 C6

Question 15

Teres Major origin

Answer 15

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

Question 16

Teres major insertion

Answer 16

medial lip of intertubercular sulcus of humerus

Question 17

innervation of teres major

Answer 17

lower subscapular nerve C5 6

Question 18

action of teres major

Answer 18

adducts and medially rotates shoulder joint

Question 19

subcapularis origin

Answer 19

subscapularis fossa

Question 20

subscapularis insertion

Answer 20

lesser tubercle of humerus

Question 21

subscapularis innervation

Answer 21

upper and lower subscapular nerve C5 C6 C7

Question 22

what type of joint is sternoclavicular joint

Answer 22

synovial but consider a saddle type

Question 23

where does the sternoclavicular joint articulate

Answer 23

between the sternal end of clavicle and the manubrium of the sternum and the 1st costal cartilage

Question 24

the sternoclavicular joint is divided into two components by what

Answer 24

articular disc

Question 25

the articular disc is firmly attach to what ligaments

Answer 25

anterior and posterior sternoclavicular ligaments | interclavicular ligament

Question 26

what does the articular disc serve as

Answer 26

a shock absorber of forces transmitted along the clavicle from the upper limbs

Question 27

what injury is most common in clavicles

Answer 27

fractures is most common and dislocation is rare

Question 28

how many articulations are between the upper limbs and the axial skeleton

Answer 28

just the sternoclavicular joint

Question 29

what reinforces the sternoclavicular joint anteriorly and posteriorly

Answer 29

anterior and posteriorly SC ligaments

Question 30

what does the interclavicular ligament do

Answer 30

strengthens the capsule superiorly

Question 31

costoclavicular ligament does what

Answer 31

anchors the inferior surface of sternal end of clavicle to the first rib and its costal cartilage, limiting elevation of the pectoral girdle

Question 32

the sternoclavicular joint does what

Answer 32

allows movements off the pectoral girdle and upper limbs

Question 33

during full elevation of the limb, the clavicle is raised to approx

Answer 33

60 degrees angle

Question 34

the sc joint can move anteriorly or posteriorly

Answer 34

about 30 degrees

Question 35

acromioclavicular joints is what type of joints

Answer 35

is a plane synovial articulation

Question 36

the acromioclavicular joint is formed

Answer 36

the acromial end of clavicle articulates with the acromion

Question 37

the articular surface of acromialclavicular joint is covered by what

Answer 37

fibrocartilalge, are separated by an incomplete wedge shaped articular disc

Question 38

what strengthens the Acromioclavicular joint

Answer 38

the Ac ligament, a fibrous band extending from the acromion to the clavicle

Question 39

what does the coracoclavicular ligament do

Answer 39

a strong, extra-articular | which anchors the clavicle to the coracooid process of scapula

Question 40

what is the conoid ligament

Answer 40

attached to the root of the coracoid process | wide attachment is to the conoid tubercle

Question 41

what is the trapezoid ligament

Answer 41

attached to the superior surface of the coracoid process | extends laterally and posteriorly to the trapezoid line

Question 42

what ligament allows the scapula and free limb to be suspend from the clavicle

Answer 42

coracoclavicular ligament | the acromioclavicular joint too

Question 43

what supplies the acromioclavicular joint

Answer 43

suprascapular and thoraco-acromial arteries | supraclavicular, lateral pectoral and axillary nerve

Question 44

what type of joint is the glenohumeral joint

Answer 44

is a ball and socket synovial joint but it makes it unstable

Question 45

what does the glenoid labrum do

Answer 45

deepens the glenoid cavity slightly

Question 46

what holds the humerus head in the cavity

Answer 46

the tonus of the muscuotendinous rotator cuff

Question 47

the glenohumeral strengthens what

Answer 47

the anterior aspect of the capsule

Question 48

glenohumeral ligament is what type of ligament

Answer 48

intrinsic

Question 49

the coracohumeral ligament strengthens what

Answer 49

the capsule superiorly | passes from the base of the coracoid process to the anterior aspect of the greater tubercle

Question 50

what ligament converts the sulcus to a canal for the tendon of the long head of bicep

Answer 50

transverse humeral ligament

Question 51

coraco-acromial arch is formed by what

Answer 51

its intrinsic protective structure | formed by inferior aspect of the acromion and coracoid process of the scapula with the coracoacromial ligament

Question 52

what prevents the superior displacement from the gleniod cavity

Answer 52

coracoacromial ligament

Question 53

What movement can the glenohumeral joint allows

Answer 53

Movement around the three axes and permits flexion, extension, abduction-adduction and circumduction

Question 54

What increases range of abduction for glenohumeral joint

Answer 54

Lateral rotation

Question 55

What muscles move the glenohumeral joint

Answer 55

Axio-appendicular muscles Scapulohumeral muscles act directly on it Shunt muscles- acting to resist dislocation

Question 56

What is the glenohumeral joint supplied by

Answer 56

Anterior and posterior circumflex humeral arteries and branches of the suprascapular artery Suprascapular, axillary, lateral pectoral nerve