14 MESSRS. F. E. BEDDARD AND F. TREVES ON THE ([Jan. 15, 
the radius at its neck, and joined also the deep fascia of the fore- 
arm. Biceps tendon of origin two inches wide and one inch 
thick. 
Supraspinatus.—A huge fleshy muscle, occupying superior border 
of scapula; covered biceps tendon; inserted on to external tuberosity ; 
it arose from the whole of the supraspinous fossa; it was covered 
by a dense aponeurosis, and into this a slender muscle from the neck 
was inserted, the origin of which was not discovered. 
Infraspinatus.—This muscle is larger than the supraspinatus ; 
it arises from the whole of the dorsum of the scapula below the 
supraspinatus ; it covered the triceps and is inserted on to the 
external trochanter. 
Extensor Muscles of Forearm (woodcut, fig. 4, p. 13). 
Extensor communis digitorum.—Arises from the extensor condyle 
with the other extensors, from the upper part of the ulna and radius, 
and from the ulnar border of the radius to halfway down that bone. 
It passes down as a fleshy muscle, and forms a flat tendon just above 
the distal end of the ulna and divides into three flat expansions, one 
for each digit. 
Extensor lateralis digitorum.—Arises from the extensor condyle 
below the extensor communis, and from the shaft of the ulna. 
Passes down through a groove on the end of the ulna, where it 
becomes tendinous. The main part of the tendon goes to the first 
phalanx of the ulnar digit, and there is a slender flattened expansion 
to the middle digit. 
Extensor obliquus metacarpi.—This muscle is bipinnate. It arises 
by one head from the extensor condyle and from the shaft of the 
radius, and by another head from the radius. The heads join just 
above the carpus, and passing round to the radial side of the wrist, 
the muscle is inserted into the radial metacarpal bone. 
Extensor metacarpi.—This arises as a broad fleshy mass from the 
extensor condyle and from the radius. Passes underneath the extensor 
obliquus as a very broad and thick tendon over a groove in distal end 
of radius, to be inserted into the carpal end of the middle meta- 
carpal bone. 
Supinator longus.—Rises in common with the other muscles, being 
the most superior (proximal) one of them, from the extensor condyle. 
Passes down as a slender muscle to be inserted into the distal end of 
the radius. 
Flexor Muscles of Forearm (woodcut, fig. 5, p. 15). 
Flexor externis metacarpi.—Rises from the extensor condyle and 
from the olecranon. It is a very big and fleshy muscle ; it is inserted 
by a small tendon into the pisiform bone. 
Flexor obliquus metacarpi.—This muscle arises by two heads: (1) 
by a tendon, in common with the flexor internus metacarpi, from the 
