CHA 101L - Quiz 1 (2 out of 3)

Medial (sternal) end of the clavicle

Circular

Lateral (acromial) end of the clavicle

The clavicle articulates with the...

- Sternum

- Acromion of the scapula

Superior side of the clavicle

Smooth

Inferior side of the clavicle

Rough with bump towards posterior side

Acromion of the scapula

- Top of the scapular spine

- Posteriorly attached to the scapular spine

Scapular spine

Supraspinous fossa

Superior to scapular spine

Infraspinous fossa

Inferior to scapular spine

Subscapular fossa

Anterior surface of scapula

Glenoid fossa

Socket for humerus in scapula (lateral)

Coracoid process

"Crow's beak"

Scapular notch

- Below the coracoid process

- Suprascapular nerve and artery run through it

Suprascapular n. innervates...

the supraspinatus and infraspinatus mm.

Superior angle

Top of the scapula

Inferior angle

The inferior point of scapula

Medial border

Lateral border

Glenoid fossa location

Head of the humerus

Orientated superiorly and medially, rounded

Anatomical neck

Surgical neck

- Inferior, below 'bulb'

- Narrow part distal to the greater and lesser tubercles

Greater tubercle

More lateral

Lesser tubercle

More anterior and inferior, protrudes out more

Intertubercular (bicipital) groove

Between the two tubercle

Shaft

Deltoid tuberosity

- Rough patch on upper shaft

- More anterior and lateral

Radial (spiral) groove)

- Smooth side next to the deltoid tuberosity

- More posterior

Condyles - Capitulum

Condyles - Trochlea

- Bigger side

- Medial part of the "bow"

Medial epicondyles

Lateral epicondyles

Olecranon fossa (HINT: Best way to tell humerus orientation)

Orientated posterior

Coronoid fossa

Orientated anterior

Anatomical and clinical importance of surgical neck of humerus

- Common fracture site

- Damage to the posterior circumflex humeral artery and axillary nerve

Anatomical and clinical importance of radial groove of humerus

- Damage to deep brachial artery and radial nerve

- Extensor muscles of the forearm can have loss of function

Glenohumeral joint

Acromioclavicular (AC) joint

Sternoclavicular joint

Scapulothoracic articulation

What is a shoulder dislocation?

At the glenohumeral joint, when the head of the humerus moves inferior and anterior to the glenoid fossa (depression)

What is a shoulder separation?

At the AC joint, the attachment of the acromion of the scapula and lateral end of the clavicle is disrupted and the AC is no longer attached (varies in severity of ligament tears)