Week 4 - Pectoral Girdle

Question 1

Does the pectoral girdle articulate w. the vertebral column?

Answer 1

No, instead is held in position + stabilised by a group of large muscles extending from the vertebral column + ribs to the scapula.

Question 2

What does each pectoral girdle consist of?

Answer 2

Clavicle + scapula

Question 3

Which is the anterior bone? - Clavicle or scapula?

Answer 3

Clavicle

Question 4

What shape is the clavicle + why?

Answer 4

Slender S-shaped

Due to medial half being convex anteriorly + lateral half being concave anteriorly.

Question 5

Define convex anteriorly

Answer 5

Curves toward you when viewed in the anatomical position

Question 6

Define concave anteriorly

Answer 6

Curves away from you when viewed in the anatomical position

Question 7

Where is the clavicle situated?

Answer 7

Horizontally across anterior part of thorax superior to 1st rib.

Question 8

What does the clavicle articulate with?

Answer 8

Manubrium of sternum at the STERNOCLAVICULAR JOINT.

Acromion of the scapula = ACROMIOCLAVICULAR JOINT.

Question 9

Is the clavicle subcutaneous?

Answer 9

Yes

Question 10

Define subcutaneous

Answer 10

Under the skin.

Question 11

What are the ends of the clavicle called

Answer 11

Rounded sternal end (medial end).

Broad, flat acromial end (lateral end).

Question 12

Conoid tubercle

What is it?

Where can it be found?

Answer 12

Attachment point for the conoid ligament, attaching the clavicle + scapula.

On the inferior surface of the lateral end of the clavicle.

Question 13

Where is the impression for the costoclavicular ligament

And what does it allow

Answer 13

Inferior surface of clavicle’s sternal end

Allows attachment of clavicle to 1st rib.

Question 14

Describe the scapula

Answer 14

Large, triangular flat bone

Question 15

Describe the spine of the scapula

Answer 15

Prominent ridge running diagonally across its posterior surface.

It’s lateral end of the spine projects as a flattened expanded process called the ACROMION.

Question 16

What can the acromion be felt as?

Answer 16

Easily felt as the high point of the shoulder.

Question 17

Where is the scapula situated?

Answer 17

In superior part of the posterior thorax between the 2nd + 7th ribs.

Question 18

What does the scapula articulate with?

Answer 18

W/ clavicle at ACROMIOCLAVICULAR JOINT

+

W/ humerus at GLENOHUMERAL JOINT (shoulder)

Question 19

Glenoid cavity of scapula

Answer 19

Shallow depression inferior to the acromion.

Accepts the head of the humerus to form GLENOHUMERAL JOINT.

Question 20

Describe the medial/vertebral border of the scapula

Answer 20

Thin edge of scapula

Question 21

Describe the lateral/axillary border of the scapula

Answer 21

Thick edge closer to the arm.

Question 22

Where do the medial + lateral borders of the scapula join?

Answer 22

At the inferior angle

Question 23

Where does the superior border of the scapula join the medial border?

Answer 23

At the superior angle

Question 24

What’s the coracoid process?

Answer 24

Small hook-like structure on the lateral edge of the superior anterior portion of the scapula.

Question 25

What are the 2 fossae that can be found superior + inferior to the spine on the posterior surface of the scapula?

Answer 25

Supraspinous fossa

Infraspinous fossa

Question 26

Supraspinous fossa

Answer 26

Attachment surface for supraspinatus muscle

Question 27

Infraspinous fossa

Answer 27

Surface of attachment for the infraspinatus muscle

Question 28

Subscapular fossa

Answer 28

Slightly hollowed-out area

Surface of attachment for subscapularis muscle

Anterior surface of scapula.