48 PROCEEDINGS OF THE ACADEMY OF [1897. 



apparent than real. It might with exactitude be said that both 

 Biceps and Semitendinosus have a common ischial stem. Certainly 

 it cannot be said, as Burmeister asserts, that the Biceps is the most 

 powerful of the bam strings. 



The " Annectant Mass " between the Gluteus maximus and the 

 Semimembranosus arises from the transverse processes of the caudal 

 vertebrae just below the sacrum by a line 7 mm. in breadth, as well 

 as from the tuberosity of the ischium above the origin of the ham 

 strings. It is inserted by fleshy fibres on the shaft of the femur for 

 a little over one-half of its length. At the caudal origin it is in 

 contact with the Gluteus maximus at its ischial origin with the ham 

 strings and at its insertion with the Adductor magnus, if, indeed, it 

 may not be said to merge with this muscle. It cannot be freed from 

 fascia without artificial dissection, being continuous with the fasci- 

 culation anteriorly and with the firm connective tissue layer over 

 the Semimembranosus posteriorly. 



Burmeister names this muscle the Pyriformis. The mutilation of 

 the Academy's specimen in the region of the pelvis prevented a 

 satisfactory study being made of the muscles arising from the sac- 

 rum and inserted on the bones of the inferior extremity. This fact 

 does not prevent the observer from deciding for himself the identity 

 of the muscle here described. The well known disposition of the 

 Semimembranosus to secure an origin from the vertebral column 

 makes it probable that a muscle in the same general region which 

 arises from the vertebral column to be inserted upon the femur 

 might be allied to this ham string. I propose to separate it from the 

 Pyriformis and place it in a position annectant between the Gluteus 

 maximus and the Semimembranosus. 



The Gemelli and Obturator internus answer to Burmeister's de- 

 scriptions. 



The Pectus femoris is small and weak and is but one-sixth as 

 wide as the main mass of the Quadriceps extensor. The origin of 

 the Rectus is tendinous with an aponeurotic extension which proceeds 

 upward over the outer surface of the Iliacus. The Vastus externus 

 is the largest part of the muscle and is almost divided into an inner 

 and outer part. The inner part receives two important accessions 

 from fascicles having extensive fleshy origins from the femur, but 

 the main body of the enormous Vastus externus is free from the 

 femur except at the great trochanter and the head of the tibia. The 

 Vastus internus resembles the Vastus externus, but receives no ac- 



