APPENDIX. ' 451 



Extensor carpi nullah's brevis. — A much more massive muscle 

 of a flattened conical form, which arises from the external ridsre 

 of the humerus ahove the external condyle in contact with the 

 last muscle. It extends down, and transmits its large rope-like 

 tendon under the extensor ossis metacarpi pollicis, and under the 

 annular ligament, which ties it down in the same osseous groove, 

 but in a distinct sheath from the extensor longus. The tendon, 

 flattening out, extends obliquely down the carpus and metacarpus, 

 to be inserted into the base of the metacarpal bone of the third toe. 



111.— NOTES OX THE GENERAL MOEPHOLOGY OF THE 

 MUSCLES.— January 1857. 



The muscular, like the osseous system, is segmented. 



This is proved — firstly, from embryology ; and, secondly, from 

 comparative anatomy. 



The primordial transversely-segmented myome, with its longi- 

 tudinally-arranged muscular fasciculi, is converted during develop- 

 ment into a complex system of longitudinal, oblique, and transverse 

 muscles. 



The morphological divisions of the muscular system by Professor 

 Johannes Muller are — 



1. Trunk lateral muscles, which in man are represented by the 

 muscles of the dorsal region. 



2. Intercostal muscles. 



3. Abdominal muscles. 



4. Muscles of limbs. 



Miiller's system is morphologically insufficient, inasmuch as it 

 only admits the lateral trunk muscles as homologous with the pri- 

 mordial muscular arrangement (or rather with the upper hah), while 

 it would appear to indicate the other divisions as superadded or 

 teleological. 



The primary subdivisions of the muscular system appear to mo 

 to bo — 



1. A layer on the inner aspect of the haemal chamber. 



2. A layer on the exterior of the sclerous. 



.">. The muscles (if the limbs, which, however, are merely modi- 



