Knott — On Abnormalities in Human Myology. 417 



Pectoralis minor. — In five cases I have seen tte tendon of this 

 muscle send a strong slip over the coracoid process to pierce the 

 coraco-acromial ligament, and blend with the capsule of the shoul- 

 der-joint. In one instance the whole tendon wound over the coracoid 

 process, and divided into two strong bands; one went to the margin of 

 the glenoid cavity, the second to the greater tuberosity of the 

 humerus. 



Pectoralis raimmus (Gruber). — Arises from anterior surface of ma- 

 nubrium sterni, rhomboid ligament, and cartilage of first rib, and 

 passes outwards in front of the costo-coracoid membrane to be inserted 

 into the inner border of the coracoid process of the scapula. It some- 

 times arises from the cartilage of the first rib alone, and such was the 

 origin of the muscle in the two examples which I have met with. 



Pectoralis qiiartus. — Arises from the fascia over the lower part of 

 the serratus magnus, and occasionally from the adjacent portions of 

 one or more ribs, and is inserted into the lower border of the tendon 

 of the great pectoral, or into the oschelbogue of Lauger. 



Subclavius. — This muscle I have found completely absent in two 

 instances. In both the deficiency was on the left side. 



Supra clavicular is proprius, v. tensor fasciae colli (Gruber) ; anomalus 

 claviculae. — Of this muscle I have met with two examples, one of which 

 has been already recorded (vide Journal of Anatomy and Physioloyy, 

 XV. 139). 



The second specimen (observed during the last winter session) had 

 similar attachments, but was much smaller. 



Acromio-clavicularis, \ . praeclavicularis lateralis (Gruber). — Consists 

 of a few muscular fibres passing from the outer third of the clavicle to 

 the tip of the acromion. I have, on one occasion, seen a small band 

 of fibres in situation so very delicate as hardly to deserve the dignity of 

 a special name. It lies superficial to the upper fibres of the deltoid, 



Omo-clavicularis {coraco-clavicularis, v. coraco-clavicularis posticus, 

 Calori, Gruber). — This muscle arises fi'om the outer end of the cla- 

 vicle, less frequently from the inner end, sometimes also from the manu- 

 brium sterni, and passes outwards to be inserted into the coracoid pro- 

 cess of the scapula. The insertion is sometimes into the upper border 

 of this bone. A similar muscular band has been described by Mr. 

 Wood under the name of — 



Scapulo-clavicularis. — This I have never succeeded in finding, 

 although I have sought for it in more than a hundred and twenty 

 subjects. 



Sterno-clavicularis ; sterno-clavicularis anticus; prae-clavicularis me- 

 dius (described and named by Gruber). — Arises from manubrium sterni, 

 anterior sterno-clavicular Kgament, and cartilage of first rib — some- 

 times from only one of these points of attachment — and passes out- 

 wards in front of the subclavius to be inserted into the middle third of 

 the clavicle. It has been found inserted into the coracoid process of 

 the scapula, when it received the name of — 



Coraco-clavicularis anticus, v. singularis. — Of the latter insertion 



