Clavicle

Question 1

Anatomical position

Answer 1

Extends between sternum and acromion

Question 2

Main functions

Answer 2

Attaches upper limb to trunk
Protects underlying neurovascular structures supplying upper limb
Transmits force from upper limb to axial skeleton

Question 3

Orientation

Answer 3

Facing forward…
Medial aspect = convex
Lateral aspect = concave

Question 4

Sternal end

Answer 4

Medial end
Large facet for articulation with manubrium at sternoclavicular joint
Inferior surface - rough oval depression for costoclavicular ligament

Question 5

Shaft

Answer 5

Point of attachment for…
Trapezius
Subclavius

Point of origin for...
Pectoralis major 
Sternocleidomastoid 
Sternohyoid 
Deltoid

Question 6

Acromial end

Answer 6

Lateral end
Small facet for articulation with acromion at acromioclavicular
Conoid tubercle - attachment of conoid ligament (medial part of coracoclavicular ligament)
Trapezoid line - attachment of trapezoid ligament (lateral part of coracoclavicular ligament)

Question 7

Fracture of clavicle

Answer 7

Most commonly fractured bone in the body
Result of fall onto shoulder or on outstretched hand
Suprascapular nerves may be damaged
These nerves innervate lateral rotators of upper limb - damage results in unopposed medial rotation of upper limb (waiters tip)

Question 8

Most common point of clavicular fracture

Answer 8

Junction of medial 2/3 and lateral 1/3
Lateral end - displaced inferiorly (by weight of arm) and medially (by pec major)
Medial end - pulled superiorly by sternocleidomastoid muscle