MSK_MT1_TBL7 (Shoulder Axilla & Arm)

Question 1

Subclavis Origin

Answer 1

1st rib and 1st costal cartilage

Question 2

Subclavius Insertion

Question 3

Subclavius Actions

Answer 3

• Stabilizes clavicle
• Depresses clavicle

Question 4

Subclavius Innervation

Answer 4

subclavian nerve

(C5-C6)

Question 5

Deltoid Origin

Answer 5

1. Lateral 1/3 of clavicle
2. Acromion of scapula
3. Spine of scapula

Question 6

Deltoid Insertion

Answer 6

Deltoid tuberosity of humerus

Question 7

Deltoid Action

Answer 7

1. Abducts the arm
2. Flexes the arm
3. Extends the arm
4. Laterally rotations
5. Medially rotations the arm

Question 8

Deltoid Innervation

Answer 8

Axillary nerve

(C5-C6)

Question 9

Supraspinatus Origin

Answer 9

Supraspinous fossa of scapula

Question 10

Supraspinatus Insertion

Answer 10

Greater tubercle of humerus

*Stabilizes shoulder muscle - rotator cuff muscle

Question 11

Supraspinatus Action

Answer 11

*Stabilizes shoulder muscle - rotator cuff muscle

Initation abduction of arm (15%)

Question 12

Supraspinatus Innervation

Answer 12

Suprascapular nerve

(C5, C6)

Question 13

Infraspinatus Origin

Answer 13

Infraspinous fossa of scapula

Question 14

Infraspinatus Insertion

Answer 14

Greater tubercle of humerus

Question 15

Infraspinatus Action

Answer 15

*Stabilizes shoulder muscle - rotator cuff muscle

lateral rotation of arm

Question 16

Infraspinatus Innervation

Answer 16

Suprascapular nerve

(C5, C6)

Question 17

Subscapularis Origin

Answer 17

Subscapular fossa of scapula

Question 18

Subscapularis Insertion

Answer 18

Lesser tubercle of humerus

Question 19

Subscapularis Action

Answer 19

*Stabilizes shoulder muscle - rotator cuff muscle

medial rotation of arm

Question 20

Subscapularis Innervation

Answer 20

Subscapular nerve

(C5, C6, C7)

Question 21

Teres major Origin

Question 22

Quadrangular Space

Answer 22

axillary space in the arm: helps the axillia “communicate” with the posterior side

important things in the space: posterior humeral circumflex artery + axiallary nerve

Question 23

Quadrangular Space Boarders

Answer 23

Superior: Teres MINOR

Inferior: Teres major

Medial: Triceps (long head)

Lateral: Humorous Bone (surgical neck)

Trauma = axillary nerve weakness = weakness of the deltoid muscle

Question 24

Triangular Space

Answer 24

the circumflex scapular artery passes through it

located medial to the quadrangular space

trauma = shoulder dysfunction, particularly with arm abduction and external rotation,

Question 25

Triangular Space Borders

Answer 25

**Superior**: Teres **Minor** Inferior: Teres Major Lateral: Tricep (long head) structures: circumflex s**capular artery**

Question 26

Trinangular Interval

Answer 26

important sturctures: **radial** nerve & **profunda** **brachii** artery located *inferior* to the quadrangular space trauma = trouble with abduction and external rotation and radial finger numbness

Question 27

Triangular Interval Boarders

Answer 27

_superior_: teres **_major_** Lateral: **lateral** head of the **triceps** or the humerus **Medial**: **long head o**f the triceps

Question 28

scapular anastomosis

Answer 28

**connects** **subclavian** **artery** to corresponding **axillary** **artery** **=** ***circulatory** **anastomosis*** around the **scapula**. (allows blood to flow past the joint in case of occlusion, damage, or pinching )

Question 29

Cubital fossa

Answer 29

**triangle** located at **elbow** joint (anterior side) contains **Median cubital vein** ( helps facilitate drainage between the basilic and cephalic veins)

Question 30

Cubital fossa Boarders

Answer 30

Medially: pronator teres Laterally: brachioradialis Top: line connecting medial and lateral epicondyles of humerus

Question 31

Pneumonic for contents of Cubital Fossa

Answer 31

Really Need (**radial** nerve) Beer To (**biceps** **tendon**) Be At (**brachial** **artery**) My Nicest (**median** nerve).

Question 32

Musles that help with ***lateral rotation of arm***

Answer 32

1. Deltoid 2. **Infraspinatus** (Rotator Cuff Muscle) of scapula 3. Teres **Minor** (Rotator Cuff Muscle) of scapula

Question 33

Musles that help with **_medial rotation_** of arm

Answer 33

1. **SUBscapularis** (Rotator Cuff Muscle) of **ANTERIOR** scapula 2. Teres **Major** 3. Deltoid

Question 34

Musles that help with **abduction** of arm

Answer 34

1. deltoid 2. S**upraspinatus** ((Rotator Cuff Muscle) of scapula (first 15%)

Question 35

Supraspinatus Tendon **Rupture**

Answer 35

* During abduction, supraspinatus tendon **friction** with **acromion** * normally friction is **reduced** by **subacromial** **bursa** In **_Supraspinatus tendinitis_** = tendon rupture or calcification = NO A**_BD_**UCTION the **deltoid** muscle **compensates**

Question 36

Adhesive Capsulitis

Answer 36

**frozen shoulder:** 50-60 y.o women most likely, Type 1 diabetics too 1. **severe** **shoulder** **pain** and increasing stiffness. 2. **loss** of shoulder **motion**, BUT less pain 3. **recovery** phase that takes from 5 to 24 months.

Question 37

Musculotaneous Nerve Supplies

Answer 37

**anterior** compartment of the **upper** arm + **LATERAL** **SENSATION** 1. Bicheps Brachii 2. Brachialis 3. Coracobrachialis

Question 38

Radial Nerve Supplies

Answer 38

**Triceps** (posterior part of arm), **brachioradialis,** extensor carpi radialis longus in trauma, **extension** of the _wrist_ and _arm_ will be effected, **supination** effected **"drop wrist"**

Question 39

Musles that help with **aDDuction** of arm

Answer 39

1. Teres **Major** 2. **Coracobrachialis** (shoulder)