104 
PROFESSOR WOOD ON THE NECK- AND SHOULDER-MUSCLES. 
arising with the omo-hyoid from the base of the coracoid process and upper border 
of the scapula, and inserted into the cervical fascia close to the scapula (quoted by 
Quain, ‘ Arteries,’ pi. 4. fig. 21). 
Macwiiinnie described a muscle as a variety additional to the omo-hyoid, arising from 
the scapula behind and internal to that muscle, forming a belly as thick as the little 
finger, and attached by a rounded tendon to the middle of the upper border of the cla- 
vicle (op. cit. p. 187). 
Hallett described a muscle arising from the upper border of the scapula with the 
omohyoid , and inserted into the upper part of the sterno-clavicular articulation. He 
also found other slips of the same general character (op. cit. p. 4). 
Luschka found a slip of muscle connected with the origin of the omo-liyoid , and in- 
serted into the back part of the inner end of the clavicle, which he considered as a variety 
of the omo-hyoid (Muller’s Arcliiv, 1856, S. 284). Similar slips are mentioned by Hyrtl 
(Lehrbuch, S. 344) and by Henle (op. cit. S. 116) as varieties of the omo-hyoid. 
Sterno-clavicular Muscle. — In the ‘Proceedings of the Royal Society’ (June 21st, 1866, 
p. 238), I described under the above name (first given by Mr. Berkeley Hill) an abnormal 
muscle found on the left side of a male subject (see Plate IX. fig. 9, /). It was triangular 
in shape, arising by a thin tendon from the front of the manubrium sterni just below the 
origin of the sterno-mastoid, formed a distinct muscular layer spreading upwards and 
outwards in a fan-shape under the pect oralis major (P), and separated from the subclavius 
(m) by the costo-coracoid membrane, and was inserted into the lower border of the cla- 
vicle about its middle third, passing as far outwards as the origin of the deltoid muscle. 
A cleido-occipital muscle ( c ) coexisted. On both sides of another male described in 
the same paper (p. 231) I found the upper digitation of origin of the pectoralis minor 
somewhat separated from the rest, and arising as high as the first intercostal aponeurosis, 
passing upwards to be inserted into the costo-coracoid membrane and clavicle. This was 
specified as a formation similar to a sterno-clavicular muscle, produced by a differentiation 
of the fibres of the pectoralis minor , as found in the Rodents. 
A similar variety was recorded by Haller (Elements of Physiology), and quoted by 
Henle. Theile also described as a variety of the subclavius a muscle arising from 
the first rib-cartilage, and inserted into the middle part of the front border of the cla- 
vicle (op. cit. p. 173). In May 1864 Mr. Berkeley Hill described a well-marked spe- 
cimen of this muscle under the above name, quoting ITaller, and pointing out its homo- 
logy in the Bats and Birds (Proc. Royal Med.-Chirurg. Soc. vol. iv. No. 6, p. 351). 
Comparative Anatomy of the three foregoing varieties. — In the Coati (Simia paniscus) 
Meckel describes a second insertion of the subclavius into the scapula (sterno-scapular), 
near the attachment of the levator anguli scapulae. This is quoted by R. Wagner (op. 
cit. S. 336) as corresponding to the double subclavius in Man. In the Insectivora I have 
found a corresponding muscle distinctly marked in the Mole (Plate X. fig. 11, i), arising 
outside the true subclavius (to) from the sternum and first rib, separated from it by an 
areolar interval ; it crossed the insertion of the supraspinatus (f), and was inserted into 
