Sternoclavicular joint is made of 3 components – sternal end of the clavicle and manubrium sterni and 1st costal cartilage
Type of joint – Synovial Double plane joint
Image Modified from By Henry Vandyke Carter – Henry Gray (1918) Anatomy of the Human Body : Gray’s Anatomy, Plate 325, Public Domain, https://commons.wikimedia.org/w/index.php?curid=85419
Sternoclavicular ligament – Marked in Green in the image – strengthens the joint capsule in the front and back.
Costoclavicular ligament – Labelled in blue color is the main stabilizing force – strong ligament and transfers the stress from clavicle to the manubrium
Nerve supply:- Supraclavicular nerve and nerve to Subclavius
Acromioclavicular joint is a synovial Plane joint between lateral end of the clavicle (numbered 1) and acromion (numbered 5)
Acromioclavicular ligament – pink ( number 7) in the pic reinforces the joint superiorly.
Coracoclavicular ligament – (from number 4 to number 1) Greenish in pic – very strong ligament which suspends the weight of the upper limb from the clavicle.
Nerve supply:- Suprascapular nerve