Week 4 - Pectoral Girdle Flashcards

1
Q

Does the pectoral girdle articulate w. the vertebral column?

A

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

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2
Q

What does each pectoral girdle consist of?

A

Clavicle + scapula

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3
Q

Which is the anterior bone? - Clavicle or scapula?

A

Clavicle

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4
Q

What shape is the clavicle + why?

A

Slender S-shaped

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

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5
Q

Define convex anteriorly

A

Curves toward you when viewed in the anatomical position

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6
Q

Define concave anteriorly

A

Curves away from you when viewed in the anatomical position

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7
Q

Where is the clavicle situated?

A

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

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8
Q

What does the clavicle articulate with?

A

Manubrium of sternum at the STERNOCLAVICULAR JOINT.

Acromion of the scapula = ACROMIOCLAVICULAR JOINT.

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9
Q

Is the clavicle subcutaneous?

A

Yes

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10
Q

Define subcutaneous

A

Under the skin.

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11
Q

What are the ends of the clavicle called

A

Rounded sternal end (medial end).

Broad, flat acromial end (lateral end).

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12
Q

Conoid tubercle

What is it?

Where can it be found?

A

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

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

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13
Q

Where is the impression for the costoclavicular ligament

And what does it allow

A

Inferior surface of clavicle’s sternal end

Allows attachment of clavicle to 1st rib.

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14
Q

Describe the scapula

A

Large, triangular flat bone

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15
Q

Describe the spine of the scapula

A

Prominent ridge running diagonally across its posterior surface.

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

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16
Q

What can the acromion be felt as?

A

Easily felt as the high point of the shoulder.

17
Q

Where is the scapula situated?

A

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

18
Q

What does the scapula articulate with?

A

W/ clavicle at ACROMIOCLAVICULAR JOINT

+

W/ humerus at GLENOHUMERAL JOINT (shoulder)

19
Q

Glenoid cavity of scapula

A

Shallow depression inferior to the acromion.

Accepts the head of the humerus to form GLENOHUMERAL JOINT.

20
Q

Describe the medial/vertebral border of the scapula

A

Thin edge of scapula

21
Q

Describe the lateral/axillary border of the scapula

A

Thick edge closer to the arm.

22
Q

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

A

At the inferior angle

23
Q

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

A

At the superior angle

24
Q

What’s the coracoid process?

A

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

25
What are the 2 fossae that can be found superior + inferior to the spine on the posterior surface of the scapula?
Supraspinous fossa Infraspinous fossa
26
Supraspinous fossa
Attachment surface for supraspinatus muscle
27
Infraspinous fossa
Surface of attachment for the infraspinatus muscle
28
Subscapular fossa
Slightly hollowed-out area Surface of attachment for subscapularis muscle Anterior surface of scapula.