Sternoclavicular joint and Acromioclavicular joint

Sternoclavicular joint

An appreciation it’s role in producing pectoral movement and the fact that their stability rests upon ligaments.

Curriculum

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

An appreciation of it’s role in producing pectoral movement and the fact that their stability rests upon ligaments. The role of the ACJ in force transmission following a fall.

Curriculum

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

Back to: Anatomy for MRCEM primary exam > Upper limb Anatomy