SHOULDER GIRDLE MUSCLES

Question 1

What are the borders of the axilla?

Answer 1

base = skin of armpit
Apex = behind middle 3rd of clavicle
Anterior wall = Pec major, minor, and subclavius
Posterior wall= subscapularis, lats, teres major
Middle wall = first 4 intercostal spaces, intercostal muscles, serratus anterior
Lateral wall = coracobrachialis muscle/humerus

Question 2

Pec minor

Answer 2

O - Lateral surfaces of ribs 3-5
I - Coracoid process
A - Brings tip of shoulder anteriorly and inferiorly
N - Medial pectoral

Question 3

Pec Major

Answer 3

O - Medial 1/3 of clavicle, manubrium, sternal body, first 6 ribs
I - Lateral lip of intertubercular groove
A - Adduction, medial rotation, horizontal adduction
N - Lateral pectoral

Question 4

What are the 3 sets of pec major fibres

Answer 4

Clavicular
Sternal
Abdominal

Question 5

Where ~is coracoid process located

Answer 5

below lateral 1/3 of clavicle

Question 6

Serratus anterior

Answer 6

O - Anterolateral aspect of ribs 1-9
I - mostly inferior angle of scap but also medial border
A - Upward rotation of glenoid, protraction of scap, stabilize scap, aids in adduction of GH
N - Long thoracic

Question 7

Subclavius

Answer 7

O - Superior aspect of 1st rib + costal cartilage
I - middle 1/3 of inferior surface of clavicle
A - Axial rotation of clavicle
N - nerve to subclavius

Question 8

Supraspinatus

Answer 8

O - Supraspinous fossa
I - Greater tuberosity
A - Abduction
N - Suprascapular

Question 9

Infraspinatus

Answer 9

O - Infraspinous fossa
I - Greater tuberosity
A - Lateral rotation
N - suprascapular nerve

Question 10

Teres Major

Answer 10

O - Lateral border of scap
I - Medial lip of intubercular groove
A - Medial rotation, adduction,
N - lower subscapular

Question 11

Teres Minor

Answer 11

O - Lateral border of scap
I - Greater tuberosity
A - lateral rotation, stabilization of GH joint
N - Axillary

Question 12

Deltoid

Answer 12

O - Ant: Lateral clavicle 
Mid: Acromion 
Post: Spine of scap 
I - Deltoid tuberosity 
A - Ant: Flexion, med rotation, adduction 
Mid: Abduction 
Post: Lat rotation, extension, adduction, 
N - Axillary

Question 13

Subscapularis

Answer 13

O - Subscapular fossa
I - lesser tuberosity
A - Medial rotation
N - Upper and lower subscapular nerve

Question 14

What are the contents of the axilla

Answer 14

• Cords of brachial plexus
• Axillary artery and vein
• 5 groups of lymph nodes

Question 15

What are the 5 groups of lymph nodes in the axilla

Answer 15

1. Pectoral or anterior group
2. Subscapular group
3. Venous group or lateral group
4. Central group
5. Apical group

Question 16

Where is the pectoral/anterior group of lymph nodes located ? where do they receive lymph from?

Answer 16

Sandwiched between pec major and pec minor

Receive lymph from lateral half of breast

Question 17

Where does the subscapular or posterior group collect lymph from

Answer 17

posterior aspect of thorax

Question 18

Where does the venous or lateral group collect lymph from

Answer 18

upper limb

Question 19

Where is the triangular space?

Answer 19

Between Teres major, Teres minor, and long head of triceps

Question 20

What does the triangular space contain

Answer 20

Circumflex scapular artery

Question 21

Where is the Quadrangular space located

Answer 21

between Teres major, Teres minor, Long head of triceps, Humerus,

Question 22

What does the quadrangular space contain

Answer 22

Axillary nerve and posterior circumflex humeral artery

Question 23

Where is the triangular interval located

Answer 23

Teres major, Long head of triceps, Humerus

Question 24

What does the triangular interval contain

Answer 24

Deep brachial artery and radial nerve

Question 25

Which nerve is commonly impinged during healing of humerus fracture? how long does this last?

Answer 25

axillary nerve

6-12 months until callus of immature bone tissue is removed