* 
120 PROFESSOR OWEN ON THE ANATOMY OF 
fore part of the preceding muscle, becomes free as it advances (Pl. XXXIX. fig. 1, s), 
and is inserted into the proper orbicularis oris (ib. q). 
Between the integument of the abdomen and the abdominal ‘ panniculus,’ there is a 
layer of tough elastic cellular tissue like a fascia. On reflecting this, a broad layer of 
muscular fibres (dermo-abdominalis) is exposed, which covers the proper abdominal 
muscles. The flattened and slightly separated fasciculi of this dermal muscle arise from 
the fascia covering the anterior and inferior part of the sternum and contiguous sternal 
ribs ; also from a median raphé of the subcutaneous fascia, attached to the linea alba, 
and extending two-thirds of the way towards the pubis. The anterior two-thirds of the 
above muscular sheet are joined by a broad layer of similar flattened fasciculi coming off 
from a fascia covering the side of the thorax, and the muscle so formed passes obliquely 
downwards and outwards, converging to form a thick fleshy band, about two inches 
broad, which is continued along the inner and upper part of the thigh, and becomes 
slightly twisted prior to its attachment to the aponeurosis covering the knee-joint. 
The posterior portion of the dermo-abdominalis consists of thinner and more scattered 
flattened fasciculi which pass outwards and downwards, and, as they diverge from the 
median line, are lost in the subcutaneous fascia covering the tendinous expansion of 
the obliquus externus abdominis. Between the dermo-abdominalis and the proper abdo- 
minal muscles there is a moderately thick layer of elastic cellular tissue. 
Reserving the details of the muscular system in general for a subsequent communi- 
cation, I proceed next to the visceral anatomy of the Great Anteater. 
Thoracic and Abdominal Cavities, and general disposition of their Viscera. 
On opening the abdomen, the liver is seen arching across the upper part of the 
abdominal cavity from the right to the left hypochondrium. The suspensory ligament 
enters a cleft to the left of the median plane, near the left end of the middle or cystic 
division, but not extending to within two inches of the anterior border of that division. 
To the right of the ligament is a wide subcircular notch, through which the fundus of 
the gall-bladder projects. Below the cystic lobe appears a prominent portion of the 
stomach, opposite the right side of the ensiform cartilage. The right lobe of the liver 
occupies the right hypochondrium, and between it and the stomach is seen a short 
convolution of the duodenum with the head of the pancreas. ‘The spleen, a long and 
narrow organ, appears below the left half of the liver, between it and the stomach, and 
then bends downward and to the right, overlapping the middle constriction of the 
stomach. A short epiploon, without fat, extends from the spleen over the left division 
of the stomach which is seen projecting below the spleen. The epiploon is reflected 
back to a line a little behind the greater curvature of the stomach. The convolutions 
of the alimentary canal occupy the rest of the exposed part of the abdominal cavity. 
A thin layer of fat was interposed between the peritoneum and the soft walls of the 
abdomen. 
