482 



Muscles of the Spine. 



I. Spinocostal Muscles (none). 



II. Spinotransversal Muscles. 



a, M. spinotransversalis lumhalis {multifidus spince ?) c', . 3*20 oz, 



From the backs of the transverse processes of all the vertebras from the 

 last dorsal to the third caudal ; into the spinous processes of the vertebras 

 in front, and into the raphe above the spinous processes (extensor). 



b, M. spinotransversalis dorsalis, . c', . . . . . 0'57 oz. 



c, M. spinotransversalis cervicalis, . e', 0*58 oz. 



From the transverse processes of the cervical and first six dorsal (tu- 

 bercle in front of rib articulation) ; is inserted direct into the occiput. 



d, M. spinotransversalis caudalis, . c' 0*63 oz. 



III. — Costotransversal Muscles. 



a. M. spinocostalis lumhalis, c, 0*811 n 



{Sacrolumhalis), c', 0-88 J * oz ' 



From the anterior crest of the ilium, below the quadratus lumborum, 

 into the outer sides of the transverse processes of all the lumbar verte- 

 bras. This muscle acts as a "guy" to the back at either side. It was 

 in a state of fatty degeneration in all the Kangaroos dissected by me. 



J. — Abdominal Muscles. 



1. M. externus obliquus, . . . a, 5*35 oz. 



Takes its origin from the lumbar fascia, and from all the ribs, except 

 the first ; and is inserted into the whole length of the Marsupial bone, 

 and into the inner edge of the pubis, above the symphysis, and into 

 the edge of the ilium ; it is continuous with the pectoralis at the extre- 

 mity of the sternum. 



2. M. cremaster, a, 0*38 oz. 



„ b, ... . . .- 0-09 oz. 



This muscle is from six to eight inches in length, and forms the 

 lower border of transver salts, and takes its origin from the edge of the 

 ilium. During coition it is reduced to two inches in length. 



3. M. transversalis, a, . . . . 1*60 oz. 



Arises from the superior anterior edge of the ilium, from the lumbar 

 fascia, and from the last two ribs ; and is inserted into the fascia of the 

 internus obliquus. 



4. M. internus obliquus, ... a, 2*63 oz. 



Arises from the last two ribs, and from the rib cartilages up to the 

 xiphoid extremity of the sternum; and is inserted into the fascia 

 abdominis. 



