MSK_MT1_DSA4 (Clavicle, Scapula & Humerus = Glenohumeral Joint.)

Question 1

Which part of the clavicle does the costoclavicular ligament attach to?

Question 2

Which artery gives rise to the nutrients branches of the clavicle?

Answer 2

suprascapular artery

Question 3

Which bony structure does the clavicle articulate with medially?

Answer 3

manubrium of sternum

Question 4

Which part of the clavicle does the interclavicular ligament attach to?

Answer 4

sternal end of the clavicle

Question 5

Which bony structure does the clavicle articulate with laterally?

Answer 5

Acromion of Scapula

Question 6

Which of the following muscles attaches to the anterior surface of the clavicle?

Answer 6

deltoid

Question 7

Which bone is responsible for transmitting traumatic impacts from the upper limb to the axial skeleton?

Answer 7

clavicle

Question 8

What bony structures does the scapula articulate with? (2)

Answer 8

1. acromeal facet of the clavicle
2. body of the humerous

Question 9

Bones of shoulder Girdle are

Answer 9

formed by:

1. the scapulae, posteriorly
2. the clavicles anteriorly

3. completed anteriorly by the manubrium of the sternum (axial skeleton).

Question 10

Function of Shoulder Girdle is

Answer 10

Connecting the upper limbs → axial skeleton

Question 11

Joints of Shoulder Girdle are (3)

Answer 11

1. Acromioclavicular (AC) joint
2. Sternoclavicular (SC) joint
3. Glenohumeral joint

Question 12

Acromioclavicular (AC) joint

Answer 12

• synovial joint
• connects to ateral part of the acromion

Question 13

Ligaments of the AC Joint (4)

Answer 13

1. acromioclavicular ligament, the sleevelike loose fibrous
2. trapezoid ligament (nearly horizontal)
3. conoid ligament (vertical)
4. coracoclavicular ligament.

Question 14

Arteries of the AC Joint (2)

Answer 14

1. suprascapular
2. thoracoacromial

Question 15

Nerves of the AC Joint (3)

Answer 15

1. suprascapular
2. lateral pectoral
3. axillary nerves

Question 16

Sternoclavicular joint (SC joint)

Answer 16

ball and socket joint

discs = shock absorber (attached by sternoclavicular ligaments)

Question 17

Ligaments of the SC joint (4)

Answer 17

1. anterior sternoclavicular
2. posterior sternoclavicular
3. the interclavicular ligament
4. costoclavicular ligament.

Question 18

Artries of the SC Joint

Answer 18

1. internal thoracic
2. suprascapular

Question 19

Nerves of the SC Joint

Answer 19

1. medial suprascapular nerve
2. the nerve to the subclavius muscle

Question 20

Glenohumeral joint

Answer 20

ball and socket type of synovial joint

movements include:

1. flexion
2. extension
3. abduction
4. adduction
5. rotation (medial and lateral rotation)
6. circumduction.

Question 21

Ligaments of the Glenohumeral joint

Answer 21

1. humeral ligament
2. coracoacromial ligament
3. glenohumeral ligament.

Question 22

Acromial facet of clavicle

Answer 22

Question 23

Sternal articular surface of clavicle

Answer 23

Question 24

Conoid tubercle of clavicle

Answer 24

Question 25

Groove for subclavius muscle

Answer 25

Question 26

Impression for costoclavicular ligament

Answer 26

Question 27

Trapezoid line of clavicle

Answer 27

Question 28

coracoclavicular ligament attach to?

Answer 28

1. trapazoid line of the clavicle 2. conoid tubericle of clavicle

Question 29

shaft of clavicle orienation?

Answer 29

medial 2/3: **convex** anteriorly lateral 1/3: **flattened** and concave anteriorly

Question 30

Sternoclavicular Joint Overview

Answer 30

Question 31

Scapula

Answer 31

**posterior** between the **2nd and 7th ribs** **acromial** of clavicle + head **humerus**.

Question 32

3 large bony processes of scapula

Answer 32

1. spine 2. acromion 3. coracoid

Question 33

superior border of scapula

Answer 33

**thin**, superior edge

Question 34

scapular notch

Answer 34

**lateral** aspect of the **superior** **border**.

Question 35

angles of scapula

Answer 35

1. superior = superior and medial borders 2. inferior = s**eventh rib and the spine of the Th 7**

Question 36

glenoid cavity or fossa

Answer 36

“pit” for the head of the humerus **1. glenoid labrum** = surrounds **outside** the glenoid to **deepen** the joint cavity. 2. **supraglenoid** tubercle = **apex** (top) of glenoid cavity 3. **infraglenoid** tubercle = immediately **inferior** (bottom) to the glenoid

Question 37

**greater** scapular notch

Answer 37

connects the **supraspinous** ---\> **infraspinous** fossa

Question 38

subscapular fossa

Answer 38

**largest** p**art** of scapualr surface (shallow concave)

Question 39

coracoid process

Answer 39

"crow’s beak" thick structure that **projects** **anterolaterally**

Question 40

Dropped Shoulder and Winged Scapula

Answer 40

caused by: 1. paralysis of the **trapezius** (accessory nerve dysfunction) 2. paralysis **serratus** **anterior** (lateral thoracic nerve dysfunction)

Question 41

Humerous Bony Features

Answer 41

**1. greater tubercle**: where rotator cuff muscles attach * (***supraspinatus***, ***infraspinatus*** and **teres** ***minor***) **2. intertubercular** groove = bicepts attach **3. lesser** **tubercle** = subscapularis muscle attach **4. surgical neck** = weakest part of bone

Question 42

lower humerous features

Answer 42

1. lateral and medial **epicondyles** = attach the **forearm** **muscles**. * groove for the **ulnar** **nerve** BELOW the **medial** **epicondyle** 2. wide **groove of the radial nerve** = rear, middle, lateral side 3. **deltoid** **tuberosity =** attaches **deltoid muscle =** lateral surface of the body

Question 43

SC Joint Forward Movement

Answer 43

Controlled by:

Question 44

SC Joint Backward Movement

Answer 44

Controlled by:

Question 45

SC Joint Elevation Movement

Answer 45

Controlled by:

Question 46

SC Joint Depression Movement

Answer 46

Controlled by:

Question 47

Anterior dislocation of SC Joint

Answer 47

In general RARE : because of **strong** **costoclavicular** ligament holds **clavicle ---\> first costal cartilage** ## Footnote 1. medial end of the clavicle **projecting** **forward** beneath the skin 2. **pulled** **upward** by the sternocleidomastoid muscle

Question 48

Posterior Dislocation of SC Joint

Answer 48

In general RARE : because of strong costoclavicular ligament holds clavicle ---\> first costal cartilage * follows direct frontal trauma = drives the **clavicle backward** * *_MORE SERIOUS_* = displaced clavicle **may press on the trachea, the esophagu**s, and major blood vessels of neck

Question 49

**transverse** **humeral** **ligament** of GH Joint

Answer 49

1. **strengthens** 2. **connects** the two tuberosities 3. **holds** the **tendon** of **biceps** muscle in place.

Question 50

Synovial membrane of GH Joint

Answer 50

1. lines the capsule 2. attached to the margins of the cartilage

Question 51

Bursae

Answer 51

a **fluid-filled sac** lined by synovial membrane provides a **cushion** and **reduce** **friction** of shoulder and arms