Muscles Of The Shoulder Girdle

Question 1

The only bony articulation between the upper limb and axial skeleton?

Answer 1

Sternoclavicular joint

Question 2

Bones of the shoulder girdle

Answer 2

1) Scapula

2) Clavicle

Question 3

Anatomical joints of the shoulder girdle

Answer 3

1) Glenohumeral joint

2) Sternoclavicular joint

3) Acromioclavicular joint

Question 4

Physiological joints of the shoulder girdle

Answer 4

Scapulothoracic joint

Question 5

What joint in the upper limb is supported by muscles

Answer 5

Scapulothoracic joint

Question 6

Which of these is not an extrinsic muscle:

a) Serratus anterior
b) Teres minor
c) Levator scapulae
d) Pectoralis minor

Answer 6

Teres minor

Question 7

Extrinsic muscle

Answer 7

Suspends scapula from the trunk. Stabilizes and/or actively moves the scapula

Question 8

Examples of extrinsic muscle

Answer 8

Serratus anterior
Levator scapulae
Trapezius
Pectoralis minor
Rhomboid major
Rhomboid minor

Question 9

Intrinsic muscles

Answer 9

Attach the scapula to the humerus

Question 10

Examples of intrinsic muscles

Answer 10

Deltoid
Teres major
Rotator cuff muscles (supraspinatus, infraspinatus, teres minor, subscapularis).

Question 11

Muscles that attach trunk to the humerus

Answer 11

Latissimus dorsi

Pectoralis major

Question 12

Anterior axioappendicular muscles

Answer 12

Serratus anterior
Pectoralis minor
Pectoralis major
Subclavius

Question 13

Posterior axioappendicular muscles

Answer 13

Trapezius
Latissimus dorsi
Rhomboid minor
Rhomboid major
Levator scapulae
Deltoid
Teres major
Rotator cuff muscles

Question 14

Trapezius:
Origin
Insertion
Innervation

Answer 14

a) Medial third of the nuchal line, external occipital protuberance, ligamentum nuchae, spinous process of C7-T12

b) Superior fiber - Lateral third of clavicle
Middle fiber - acromion process of scapula
Inferior fiber - Spine of scapula

c) Accessory nerve (CN XI) (motor fibers) & C3, C4 spinal nerve (pain & proprioceptive fibers)

Question 15

Action of trapezius

Answer 15

Superior fiber - Elevates scapula

Middle fiber - Retracts scapula

Inferior fiber - Depresses scapula

(Superior & inferior fibers act together to rotate glenoid cavity superiorly).

Question 16

Strap-like muscle in the upper limb?

Answer 16

Levator scapulae

Question 17

Levator scapulae:
Origin
Insertion
Innervation

Answer 17

a) Posterior tubercules of transverse process of C1-C4

b) Medial border of scapula superior to the root of the spine of the scapula

c) Dorsal scapula (C5), cervical nerves (C3 & C4)

Question 18

The inferior third of levator scapulae is deep to what muscle?

Answer 18

Trapezius

Question 19

Superior third of levator scapulae is deep to what muscle?

Answer 19

Sternocleidomastoid

Question 20

The rhomboid muscles have a rectangular shape

Answer 20

False.

Rhomboid appearance

Question 21

________ forms broad parallel bands that pass inefriolaterally from the vertebrae to the medial boarder of the scapula

Answer 21

The Rhomboid muscles

Question 22

The rhomboid muscles pass superiolaterally from the vertebrae to the medial boarder of the scapula?

True

False

Answer 22

False.

Inferiolaterally.

Question 23

Rhomboid major is ____ & _____ times wider than rhomboid minor

Answer 23

Thin

2

Question 24

Rhomboid minor is the thinner muscle of the two rhomboid muscles

Answer 24

False.

Thicker than rhomboid major but not as wide

Question 25

Which of the two rhomboid muscles is the superior one?

Answer 25

Rhomboid minor

Question 26

Rhomboid minor Origin Insertion Innervation

Answer 26

1) Nuchal ligament, spinous process of C7 - T1 vertebrae 2) Smooth triangular area at the end of the spine of the scapula 3) Dorsal scapula (C4, C5)

Question 27

Rhomboid major Origin Insertion Innervation

Answer 27

1) Spinous process of T2 - T5 2) Medial boarder of scapula from level of spine to inferior angle 3) Dorsal scapula (C4, C5)

Question 28

Action of rhomboid minor

Answer 28

Retracts scapula (adducts scapula) Fixes scapula to thoracic wall Rotates scapula to depress its glenoid cavity

Question 29

Action of rhomboid major

Answer 29

Retracts scapula (adducts scapula) Fixes scapula to the thoracic wall Rotates scapula to depress its glenoid cavity

Question 30

What makes the medial wall of the axilla?

Answer 30

Serratus anterior

Question 31

Serratus anterior overlies the medial boarder of the thorax

Answer 31

False. It lies on the lateral part of the thorax

Question 32

Serratus anterior Origin Insertion Innervatiom

Answer 32

1) External surface of the lateral portion of the 1st - 8th ribs 2) Anterior portion of the medial boarder of the scapula 3) Long thoracic nerve (C5, C6 & C7)

Question 33

Action of serratus anterior

Answer 33

Protracts scapula (abduction) Holds scapula against thoracic wall Rotates scapula at the inferior angle

Question 34

What clinical ailment is the medial end of the scapula away from the thorax?

Answer 34

Winged scapula

Question 35

What leads to winged scapula?

Answer 35

Insufficiency of the serratus anterior Damage/lesions to the long thoracic nerve

Question 36

Pectoralis minor and ____ form a bridge under which nerves and vessels must pass to the arm

Answer 36

Coracoid process of the scapula

Question 37

Pectoralis minor is a fan-shaped muscle

Answer 37

False. Triangular muscle.

Question 38

The bulk of muscles on the shoulder is the _____?

Answer 38

Deltoid

Question 39

Deltoid: Origin Insertion Nerve supply

Answer 39

1) Lateral third of clavicle, acromion process of scapula & spine of scapula 2) Deltoid tuberosity on the humerus 3) Axillary nerve (C5 & C6)

Question 40

Action of deltoid muscle

Answer 40

Anterior fiber: Flexion and medial rotation of the humerus Middle fiber: Elevation (abduction) Posterior fiber: Extension and lateral rotation of the arm

Question 41

Teres major: Origin Insertion Nerve supply

Answer 41

1) Posterior surface of inferior angle of scapula 2) medial lip of intertubercular sulcus 3) Lower subscapular nerve (C5 & C6)

Question 42

Structures found around the suprascapular notch

Answer 42

Superior transverse suprascapular ligament Suprascapular nerve which runs through the ligament Suprascapular vein and artery which run above the ligament

Question 43

Ligaments around the shoulder joint

Answer 43

Inferior transverse suprascapular ligament Coracoacromial ligament Superior scapulohumeral ligament Middle scapulohumeral ligament Inferior scapulohumeral Conoid ligament Acromioclavicular ligament Trapezius ligament Transverse humeral ligament