Week 4 - Pectoral Girdle Flashcards
Does the pectoral girdle articulate w. the vertebral column?
No, instead is held in position + stabilised by a group of large muscles extending from the vertebral column + ribs to the scapula.
What does each pectoral girdle consist of?
Clavicle + scapula
Which is the anterior bone? - Clavicle or scapula?
Clavicle
What shape is the clavicle + why?
Slender S-shaped
Due to medial half being convex anteriorly + lateral half being concave anteriorly.
Define convex anteriorly
Curves toward you when viewed in the anatomical position
Define concave anteriorly
Curves away from you when viewed in the anatomical position
Where is the clavicle situated?
Horizontally across anterior part of thorax superior to 1st rib.
What does the clavicle articulate with?
Manubrium of sternum at the STERNOCLAVICULAR JOINT.
Acromion of the scapula = ACROMIOCLAVICULAR JOINT.
Is the clavicle subcutaneous?
Yes
Define subcutaneous
Under the skin.
What are the ends of the clavicle called
Rounded sternal end (medial end).
Broad, flat acromial end (lateral end).
Conoid tubercle
What is it?
Where can it be found?
Attachment point for the conoid ligament, attaching the clavicle + scapula.
On the inferior surface of the lateral end of the clavicle.
Where is the impression for the costoclavicular ligament
And what does it allow
Inferior surface of clavicle’s sternal end
Allows attachment of clavicle to 1st rib.
Describe the scapula
Large, triangular flat bone
Describe the spine of the scapula
Prominent ridge running diagonally across its posterior surface.
It’s lateral end of the spine projects as a flattened expanded process called the ACROMION.
What can the acromion be felt as?
Easily felt as the high point of the shoulder.
Where is the scapula situated?
In superior part of the posterior thorax between the 2nd + 7th ribs.
What does the scapula articulate with?
W/ clavicle at ACROMIOCLAVICULAR JOINT
+
W/ humerus at GLENOHUMERAL JOINT (shoulder)
Glenoid cavity of scapula
Shallow depression inferior to the acromion.
Accepts the head of the humerus to form GLENOHUMERAL JOINT.
Describe the medial/vertebral border of the scapula
Thin edge of scapula
Describe the lateral/axillary border of the scapula
Thick edge closer to the arm.
Where do the medial + lateral borders of the scapula join?
At the inferior angle
Where does the superior border of the scapula join the medial border?
At the superior angle
What’s the coracoid process?
Small hook-like structure on the lateral edge of the superior anterior portion of the scapula.
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
Supraspinous fossa
Attachment surface for supraspinatus muscle
Infraspinous fossa
Surface of attachment for the infraspinatus muscle
Subscapular fossa
Slightly hollowed-out area
Surface of attachment for subscapularis muscle
Anterior surface of scapula.
