PROFESSOR WOOD ON THE NECK- AND SHOULDER-MUSCLES. 
103 
eighth thick (Y), arose from the base of the coracoid and suprascapular ligament, and 
passing upwards and forwards was inserted into the outer third of the clavicle (x), close 
to the subclavnts muscle (on on) ; it was quite distinct from the first-described sterno- 
scapular muscle, but was connected with it to the origin of the omo-hyoid, which was 
normal in all other respects. In my paper of 18G8 I noted another specimen of this 
formation on the left shoulder of a male subject. These abnormal human varieties, the 
sterno-scayular and scayulo-clavicular muscles, 1 have been found in comparatively few 
subjects, partly, I believe, on account of the difficulty of preserving them entire in the 
ordinary way of apportioning the subject to different students, and the liability of the 
latter especially to be removed along with the fat and tissues which fill up the interval 
between the scapula, clavicle, and first rib when the vessels and nerves are dissected. I 
haA^e therefore considered that any estimate of their frequency in the human subject 
Avould necessarily be a fallacious one. 
The sterno-scayular muscle corresponds in most respects with the following abnormal 
muscular slips described by their observers under various names. 
Meckel described a double subclavins muscle, and compared it to the external and 
internal intercostals (Muskellehre, 1816). It had preAuously been described by Boehmer 
as a muscle connected Avith the origin of the subclavins , and inserted into the coracoid or 
acromion ( ! ) process (Observ. Anat. rar. prsefat. Halle, 1756, p. ix) ; and also by Haller 
as a double subclavins (He Corp. Hum. Eabr. t. v. part i. p. 95 a , and t. vi. p. 77, 1756); 
and by Scemmerring as a variety of the oono-hyoid , arising from the first rib and inserted 
into the scapula (De Corp. Hum. Fabr. t. iii. p. 173, 1796); and by Bosenmuller, on 
the left side of a male subject arising from the rib-cartilage behind the subclavins , and 
inserted near the base of the coracoid process (Beitrage fiir die Zergliederungskunst, Bd. i. 
Heft 3, S. 375, Tab. ii., and ‘He nonnullis Musculis,’ 1814, p. 6). 
B. Wagner described it as a variety of the oono-hyoid , arising from the first rib-cartilage, 
and inserted into the mcisura scayulcc Avith the origin of the omo-hyoid (Heusinger’s 
Zeitschrift, Bd. iii. S. 335). 
Theile described a rounded muscle, arising from the first rib-cartilage, and inserted 
into the base of the coracoid and upper border of the scapula, in a male subject in 
Avhom the omo-hyoid was wanting. He considered it as a A-ariety of the serratus magonus 
(Scemmerring’s Encyclop. Anat., Jourdan’s Trans, p. 206, 1843). 
Macwhinnie quotes Haller and Scemmerring as above (oy. cit. p. 187). Hallett 
describes as a A 7 ariety of the omo-hyoid a considerable slip of muscle, connected by one 
tendon to the first rib-cartilage, and by another inserted into the upper border of the 
scapula with the origin of a normal omo-hyoid (oy. cit. p. 4). Gruber also describes a 
similar abnormality as connected with the oono-hyoid (Vier Abhand. 1847, and Neue 
Anomalien, 1849). 
The Scayiclo-clavicular variety I believe to be homologically identical with the mus- 
cular slips described by the following writers. 
Yon Krause described, under the name of the coraco-cervicalis , a slip of muscle 
