| OCR Text |
Show 540 MR. F. E. BEDDARD ON THE [Apr. 21 The biceps is large and fleshy, about an inch across at its origin. The tendinous sling through which it passes to its insertion is formed of two strong ligaments attached to the femur; one of them is identical with the head of the gastrocnemius. In addition to these two, there is a broad coarsely fibrous band running from the bottom of the loop to one of the flexors of the foot. The ambiens, the femorocaudal, and the accessory semitendinosus are absent. The accessory femorocaudal is a thin muscle tendinous at both origin and insertion. The semitendinosus and the semimembranosus appear to form one intimately conjoined muscle, which gives off before its insertion a very delicate tendinous slip to the gastrocnemius. Only one peroneus is present in AEchmophorus. The origin of this overlaps that of the tibialis anticus. The tendon in which it ends is inserted into the mass of fibro-cartilage at the ankle through which the flexor tendons bore their way. The tibialis anticus has a tendon which is bifid at its insertion; just in front of the point at which the tendon divides, a tendinous slip is given off which runs for some way down the foot and is finally fixed to skin. The extensor communis digitorum divides into three tendons for the toes. That supplying digit II. remains a single tendon. The tendon supplying digit III. divides into three separate tendons; while the tendon supplying digit IV. divides into two. The gastrocnemius has the usual three heads. The inner is much the largest, and its origin commences at the very summit of the great cnemial crest of the tibia and extends halfway down the leg. The outer head arises, as has been already mentioned, in common with the tendinous sling of the biceps. These two heads end in tendons at precisely the same level below. Shortly after this (about f inch) they join. The third head arises in common with the tendinous insertion of the outer of the two adductors; its tendon (ossified) joins that of the inner head some way in front of the junction of the inner and outer heads. Flexores perforati.-There are the usual three muscles supplying the three digits. Their tendons are not connected with each other, or with the tendons of the flexor perforatus et perforans, in any way. Flexor perforatus et perforans.-Only one digit (III.) is supplied by this. The tendons of the flexor profundus digitorum and of the flexor longus hallucis are intimately fused for a considerable length. From the conjoined tendon no slip is given off to the hallux. Each of the other digits has its own slip. The tendon supplying digit II. arises first; then the remaining part of the tendon divides into two, each half supplying digits III. and IV. § Comqoarison of iEchmophorus ivith other Colymbi. My information as to the myology of other Grebes is derived |
