886 MB. F. G. PARSONS ON THE [NoV. 29, 



The ventral trunk of the internal iliac runs backward in the pelvis 

 and soon gives off the sciatic artery ; some little distance beyond 

 this it divides into its two terminal branches, the obturator and 

 internal pudic. 



The External Iliac Artery runs along the brim of the true 

 pelvis to the middle of Poupart's ligament, where it becomes the 

 Femoral \ this, almost at once, gives off a big branch {Internal 

 Oirmnrflex), which sinks into the substance of the thigh, passing 

 round the inner side of the head of the femur. Nearly opposite 

 the origin of this another branch {External Circumflex) runs outward 

 and divides into a superficial and deep division, while almost at the 

 same point another artery (Profunda femoris) passes backward and 

 breaks up to supply almost all the muscles of the thigh. The 

 continuation of the femoral artery which is now the Superficial 

 Femoral runs downward as far as the middle of the inner side of 

 the thigh, where it divides into Popliteal and Internal Saphenous. 

 The former, which is the larger, runs to the popliteal space ; the 

 latter passes superficially across the gracilis {Adductor cruris) and 

 reaches the inner side of the leg just behind the inner border of 

 the tibia ; it then passes down behind the internal malleolus to the 

 sole of the foot, where it forms a plantar arch superficial to the 

 plantar tendons. From this arch branches are given off to the 

 2nd and 3rd, and 3rd and 4tli digits. At the posterior part of the 

 sole of the foot a small external plantar artery is given off, which 

 accompanies the nerve of the same name and supplies the deep 

 muscles of the sole as well as the 5th digit. The Popliteal Artery, 

 after giving off articular branches to the knee-joint, divides into 

 anterior and posterior tibial at the upper border of the popliteus 

 muscle. The Posterior Tibial is a small artery which ends in the 

 muscles of the calf. The Anterior Tibial passes in front of the 

 popliteus, pierces the interosseous membrane, and supplies the 

 muscles in front of the leg, a very small branch continuing on to 

 the dorsum of the foot. 



The Venous System.- — The veins were examined, but nothing 

 special was noticed. There are, as has been mentioned, two 

 anterior venae cavse. 



The Thymus is a small irregular mass in the anterior (cephalic) 

 mediastinum ; it is about k inch long by \ inch broad, and is 

 divided into two lobes, which communicate across the middle line 

 in two places. In the foetal specimen the thymus is not very large, 

 and it does not relatively occupy much more of the thorax than in 

 the adult. The Adrenals are situated as usual just anterior to the 

 kidneys ; the left is a good deal larger than the right, and is rather 

 fiu'ther from the kidney. 



TTie Nervous System. 



The Cranial Nerves. — Xo difference was noticed between these 

 nerves and those of the Eabbit, except that no ansa hypoglossi was 

 found. The sterno-hyoid and sterno-thyroid muscles were supplied 

 by branches from the second and third cervical nerves. As the loop 



