1895. | NEW YORK ACADEMY OF SCIENCES. 247 
the pectoral tendon, the remainder into the outer margin of the 
short bicipital head and into the Coraco-brachialis, which muscle 
is strongly developed in its upper part. 
3. 6, Germany. aet. 64. October 14, 1893. 
Plate XXXI. Right upper extremity. 
Double glenoid tendon, the outer division giving off a branch 
to join the deep surface of the pectoral tendon. The tendons of 
origin then unite and form a muscular belly which passes down 
and in over the long bicipital head to join the deep surface and 
outer margin of the short head. 
3. GLENO-EPITROCHLEAR TENDON. 
Diagnosis: Origin as Capsulo-pectoral fibres from glenoid 
margin with capsule of shoulder. Connected with deep surface 
of Pectoralis major tendon at the lower border of which the 
fibres are gathered into a long, slender tendon which passes 
obliquely down- and in, across the Biceps, brachial vessels and 
large nerves, to be inserted into the anterior part of the internal 
epicondyle. 
The structure exhibited by this variation in its upper portion 
is such as to admit of no doubt of its identity with the fibres 
described above’as Capsulo-pectoral and Gleno-ulnar with inter- 
mediate pectoral connection. 
The lower long tendon with its epicondylar implantation rep- 
resents, I believe, a rudimentary Gleno-ulnar muscle, whose in- 
sertion has been shifted to the internal epicondyle. The latter 
is a point frequently selected for the insertion of aberrant and 
rudimentary tendon slips, as instanced by the Dorso-epitroch- 
learis and Chondro-epitrochlearis muscies. 
The supposition that the variation just mentioned and some 
of the previously described bicipital variations can be brought 
into connection with aberrant pectoral muscle or tendon slips 
is refuted by the constant connection with the capsule, and by 
means of the same with the glenoid margin of the scapula. 
The pectoral varieties described as Chondro-humeral, Chondro- 
coracoid and Chondro-epitrochlear muscles are connected at 
times with the lower border of the pectoral muscle and tendon, 
but they are evidently derivatives from the pectoral plane, and 
never assume the characteristic relation to the deep surface of 
the pectoral tendon and shoulder capsule exhibited by the bi- 
cipital variations above described. 
I have met with four well-marked instances of the Gleno- 
epitrochlear tendon in the series examined. 
Cases : 
