DR. J. MURIE ON THE ANATOMY OF THE SEA-LION. 549 
second (Lc) (posterior or vertical portion of human anatomy) is much larger and fleshy. 
It arises from the ventral surface of the bodies of the second, third, fourth, fifth, sixth, 
and seventh cervical vertebre, and from the third and fourth transverse processes, 
clasping the rectus anticus major within the fork. Entering the chest, the longus colli 
continues backwards to the seventh dorsal vertebra. 
The somewhat large and fleshy rectus anticus major (R.a.ma) arises from the under 
surfaces of the third, fourth, fifth, and sixth cervical vertebrae, and, continuing onwards, 
terminates by a narrow, but strong, insertion on the basilar portion of the occipital bone. 
The two rectus anticus minor muscles are each rather narrow and placed wide apart. 
their fibres not touching at any portion of their course (#.a.mi). Origin, the ventral 
surface of the atlas at the root of the transverse process. Insertion, the basioccipital 
bone, behjnd and beneath the basilar plate. 
4. Muscles of the Abdomen and Chest. (Plates LXX. to LXXIIL.) 
External oblique—Correspondent in length with the elongated costo-abdominal 
region, this extensive and fleshy sheet (figs. 15 & 33, E.0) arises forwards, on the side 
of the thorax, by digitations from the fifth to the fifteenth ribs. The hindermost seven 
of these interdigitate with those of the latissimus dorsi. The muscle of either side 
forms the median abdominal line backwards from the ensiform cartilage, which is 
about opposite the cartilage of the eighteenth rib. The other attachments are, as 
usual, the lumbar fascia and crest of the ilium. The insertion, which is into the 
symphysis pubis, extends as far back as the pubic arch, but outside the rectus. ‘The 
external abdominal ring is barely visible, and little over half an inch in length. It is 
narrow, and oval in-shape. 
Internal oblique—This muscle (J.0, fig. 33), which is of moderate thickness, has the 
following attachments,—the crest of the ilium, the lumbar fascia, and the tips of the 
cartilages of the three hindermost ribs. The fibres have the usual downward and for- 
ward direction; they may be said, however, not to pass the outer edge of the rectus; at 
this place they interblend with the transversalis muscle by fibrous tissue. From the 
crest of the ilium backwards the fibres of the internal oblique are nearly transverse in 
direction, and they reach almost to the pubis. They do not take any share in Poupart’s 
ligament, which is formed solely by the external oblique. 
Cremaster.—This muscle is present although diminutive. It is, as usual, formed by 
the terminal fibres of the internal oblique. 
The transversalis is attached forwards to the six hindermost rib-cartilages; but its 
fibres do not quite reach those of the diaphragm. The muscular bundles of fibrill are, 
as usual, transverse in direction, and quite reach the middle line of the abdomen. Its 
further attachments are the lumbar fascia, and that derived from the transverse pro- 
cesses of the vertebre between the ilium and the ribs. The posterior border of the 
muscle reaches no further back than about opposite the iliac crest (fig. 33, 77). 
