[Muscle/Ligament] Conoid ligament (the medial part of the coracoclavicular ligament) [Other attachment] conoid tubercle [Attachment on collarbone] 
Inferior surface
S u p e r i o r s u r f a c e a n d a n t e r i o r b o r d e r
S u p e r i o r s u r f a c e
I n f e r i o r s u r f a c e
A n t e r i o r b o r d e r
P o s t e r i o r b o r d e r