Pectoral Girdle - Clavicle

Question 1

What shape is the clavicle?

Answer 1

S-shaped

Question 2

What is another name for the sternal end?

Answer 2

Medial end/extremity

Question 3

What is aother name for the acromial end?

Answer 3

Lateral end/extremity

Question 4

What end of the clavicle is round and what end is flatter?

Answer 4

Round: sternal end
Flat: acromial end

Question 5

What surface has topography, inferior or superior, and why?

Answer 5

Inferior surface as it is the reverse of rib 1 so it had the subclavian vessels running along its surface

Question 6

How does the clavicle act as a ‘strut’?

Answer 6

By holding the glenohumeral joint in the parasagittal plane

Question 7

What are the functions of the clavicle?

Answer 7

Act as a strut
Weight bearing/transmit weight
protects auxillary neurovascular bundle along its course from neck to upper limb

Question 8

What does the clavicle articulate with at the acromial end?

Answer 8

Scapula

Question 9

What does the clavicle articulate with at the sternal end?

Answer 9

Manubrium/sternum

Question 10

Where is the trapezoid line/ridge and what attaches here?

Answer 10

On the inferior surface near the acromial end

Trapezoid ligament attaches here

Question 11

Where is the conoid tubercle and what attaches here?

Answer 11

On the inferior surface near the acromial line

Conoid ligament attaches here

Question 12

What groove/sulcus is on the inferior surface?

Answer 12

Subclavian

Question 13

What is the nutrient foramen?

Answer 13

A small hole where nutrients can enter the bone

Question 14

What tuberosity is on the sternal end/inferior surface?

Answer 14

Costal tuberosity (is an impression for costoclavicular ligament)

Question 15

What articular surface is closer to the sternal end?

Answer 15

1st costal cartilage articular surface

Question 16

Name the borders and surfaces

Answer 16

Anterior and posterior borders

Superior and Inferior surfaces

Question 17

Name the 2 curvatures

Answer 17

Medial curvature (takes up 2/3rds of clavicle)
Lateral curvature (takes up 1/3rd of clavicle)

Question 18

Where is thr nutrient foramen usually found?

Answer 18

Medial 2/3rds

Question 19

Is the nutrient foramen single?

Answer 19

It can be single or double - usually single

Question 20

What originates from the costal tuberosity and inserts into the 1st rib?

Answer 20

costoclavicular ligment

Question 21

Describe origin and insertion of pectoralis major

Answer 21

Origin: anterior medial clavicle (and sternum)
Insertion: lateral lip of bicipital groove of humerus

Question 22

Decribe the movements produced by pectoralis major

Answer 22

Adduction, medial rotation and flexion of arm

Question 23

Decribe origin and insertion of sternohyoid

Answer 23

Origin: posterior medial clavicle (and manubrium)
Insertion: hyoid

Question 24

Describe the movement of sternohyoid

Answer 24

depresses hyoid

Question 25

Describe origin and insertion of subclavius

Answer 25

Origin: rib 1 and cartilage
Insertion: subclavian groove of clavicle

Question 26

Describe the movements of subclavius

Answer 26

depresses clavicle

Question 27

Describe the origin and insertion of trapezius

Answer 27

Origin: spine
Insertion: lateral posterior clavicle (and superior nuchal line and scapula)

Question 28

Describe the movements of trapzeius

Answer 28

elevation, adduction, depression and rotation of scapula

Question 29

Describe the origin and insertion of sternocleidomastoid

Answer 29

Origin: medial posterior clavicle (also manubrium)
Insertion: mastoid process of temporal bone

Question 30

Describe the movements of sternocleidomastoid

Answer 30

head rotation and flexion

Question 31

Decribe the origin and insertion of deltoid

Answer 31

Origin: lateral anterior clavicle (and scapula)
Insertion: deltoid tuberosity on humerus

Question 32

Describe the movements of deltoid

Answer 32

flexion, extension, rotation and abduction of arm

Question 33

Name the non-metric traits of the clavicle

Answer 33

Shape and size vaires
Variation in appearance of costal tuberosity
Variation in position of nutrient foramen
Variation in size of acromion

Question 34

Describe problems with the fracture of a clavicle

Answer 34

Healing can be incomplete and leave the clavicle deformed

Fracture can rupture subclavian vessels