136 couES, 



very short tendon, into the episternnm, a little below and in front of 

 the edge of the bar, on either side of the median line, in apposition 

 with its fellow. It forms, as usual, the letter X with the omo-hyoid. 

 The deep portion is much smaller; it has a separate but contiguous 

 tendon of origin " from the mastoid," and in the neck lies directly 

 beneath, and in apposition with, the other for its whole length. 

 Though thus entirely covered, its course, particularly below, is a 

 trifle oblique to that of the superficial portion, whereby it gains, at 

 length, the outer border of the latter, becomes superficial, and is in- 

 serted into the border of the episternal bar, at junction of first and 

 middle third, where the insertion of trapezius ends. 



Hyoid Muscles. — The fleshy band that lies upon the wind-pipe is 

 barely or not separable, without forcing the dissection, into right and 

 left halves ; there is no distinction whatever of a sterno-thyroid from 

 sterno-hyoid ; nor is a thyro-hyoid demonstrable. The common band 

 of muscle arises inside the thorax on the median line, from the lower 

 part of the inner surface of the manubrium sterui (not from the 

 episternnm), and runs uninterruptedly up the trachea to the larjmx. 

 The median part of the band is attached above to the thyroid carti- 

 lage, while the lateral portion passes up without attachment to be 

 inserted into the side of the os hyoides, and especially into the 

 enlargement of the greater cornu; this portion, moreover, appears 

 continuous with hyo-glossus. In like manner mylo-hyoid and omo- 

 hyoid are connected, if not continuous, at the hyoid bone; there is 

 trace of a tendinous intersection, but the hyoid insertion (into the 

 side of the body of the bone) of the two is identical, and some 

 at least of the muscular fibres are not interrupted. The mylo-hyoid 

 passes a little outward as it goes to the jaw, and is inserted fleshy 

 upon the outside of the ramus, partly overlapping the latter, and 

 being itself partly overlapped by a muscle to be presently noticed («). 

 There is no evident distinction of genio-hyoid from genio-hyo-glossus-; 

 though these are united (or separated, if the term be preferred) by a 

 tendinous intersection; but the genio-hyo-glossus, on the other hand, 

 is mostly distinct from the hyo-glossus. The genio-hyoid runs obliquely 

 forward and spreads outward, partlj^ in apposition wath its fellow, 

 to be inserted along the greater part of the ramus of the lower jaw, 

 like the mylo-hyoid, instead of culminating at the symphysis menti. 

 The genio-hyo-glossus forms as usual a vertical plane, in apposition 

 with its fellow on the median line ; behind, it has the ordinary attach- 

 ment to the OS hyoides, and is considerably blended with the hyo- 

 glossus ; its anterior connections are rather with the genio-hyoid than 

 with the jaw itself. The hyo-glossus is the longest and most distinct 

 muscle of the three, though continuous behind with the sterno-hyoid, 

 as already stated ; it forms a terete bundle on either side of the under 

 surface of the tongue. 



