ANATOMY OF THE HORSE. 
441 
hyoideus magnus. — Kerato-hyoideus Magnus . 
Situation. —Antero-superior part of the neck. 
Form. —Fusiform: flattened upon its sides. 
Attachment. —Posteriorly, to the postero-inferior part or angle 
of the comer of the os hyoides; anteriorly, to a little tubercle 
rising from the middle and inferior part of the semicircular por¬ 
tion of the same bone. 
Direction. —Oblique : from behind, forwards; and from above, 
downwards. 
Relation. —Below, with the stylo-maxillaris, digastricus, and 
parotid gland; above, with the corner of the os hyoides, ninth 
pair of nerves, and lingual vessels : externally, with the pterygoi- 
deus intern us; internally, with the larynx and recurrent nerve. 
Structure. —Tendinous and fleshy at its posterior attachment; 
ending in a slendor tendon, anteriorly. 
Action. —To draw the body of the os hyoides still nearer to the 
side of the jaw, and thereby assist in the dilatation of the glottis. 
hyoideus parvus. — Kerato-hyoideus Parvus. 
Situation. —Above and rather before the preceding muscle. 
Form. — Small, flat, triangular. 
Attachment. —To the body and appendix of the os hyoides, 
filling up the triangular space between them. 
Action.— To approximate these parts. 
STYLO-IIY OIDEUS. 
Situation. —Infero-anterior part of the neck. 
F'igure. —Quadrilateral. 
Attachment. —Posteriorly, to the front of the styloid process of 
the occipital bone ; anteriorly, to the angle of the hyoideal corner. 
Relation. —Externally, with the parotid gland ; internally, with 
the guttural membrane: inferiorly, with the stylo-maxillaris; pos¬ 
teriorly, with the obliquus capitis superior. 
Structure. —Fleshy, with tendinous intersections. 
Action. —To retract, and at the same time elevate, the corner 
of the os hyoides. 
[To be continued.] 
