220 



riiE AirriciLATioxs 



(h) The C'oKAco-CLAVJcuLAii Umon 



Till- coraco-clavicular ligament (figs. 222, 223 and 226) consists of two parts, 

 the conoid and X\iv trapezoid ligaments. 



The conoid ligament is the internal and posterior portion, and passes upwards 

 and outwards from the coracoid process to the clavicle. It is a very strong and 

 coarsely fasciculated band of triangular shape, the apex being fixed to the inner and 

 posterior edge of the root of the coracoid process just in front of the suprascapular 

 notch, some fibres joining the transverse ligament. Its base is at the clavicle, 

 wliere it widens out, to be attached to the posterior edge of the under surface, as 

 well as to the conoid tubercle. It is easily separated from the trapezoid without 

 being al)S()lutely distinct. A small bursa often exists between it and the coracoid 

 process; internally, some of the fibres of the svbdavius muscle are often attached 

 to it. 



The trapezoid ligament is the anterior and outer portion. It is a strong, flat, 



Fig. 222. — Anterior View of Shoulder, showing also Coraco-clavicular and 

 cokaco-acromial ligaments. 



Conoid ligament 



Transverse scapular ligament wIl 8 / 



jB&\ \/ Tiapezoid ligament 



Coraeo-aeromial ligament 



Short head of biceps 

 Subscapular tendon 



Capsule of shoulder 



Long tendon of 

 biceps 



• luadrilateral ])lane of closely-woven fil)res, the surfaces of which look ui)wartls and 

 inwards towards the clavicle, and downwards and outwards over the upper surface 

 of the coracoid i)rocess. At the coracoid it is attached for about an inch (2*5 cm. ) 

 to a rough ridge which runs forwards from the angle, along the anterior border of 

 the process. At the clavicle, it is attached to the ol^lique ridge Avhich runs out- 

 wards and forwards from the conoid tul)ercle, reaching as far as, and blending with 

 the inferior part of the acromio-clavicular ligament. Its anterior edge is free, and 

 overlies the coraeo-aeromial ligament; the posterior edge is shorter than the anterior, 

 and is in contact with the posterior and outer ])ortion of the conoid ligament. 



Tlie arterial supply is derived from the su])rascaiHdar, acromial branches of 

 the aeromio-tlioracic, and the anterior circumflex. 



The nerve-supply is derived from the suprascapular and circumflex nerves. 



Movements. — In the movements of the shoulder girdle, the scapula moves 

 U[)on the outer end of the clavicle, and the clavicle, in turn, carried bv the uniting 



