HYOID MUSCLES — MUSCLES OF THE THORACIC LIMB 



319 



The digastricus is usually not digastric, but is a strong, round, fleshy muscle, 

 which arises on the paramastoid or styloid process and is inserted into the border 

 and inner surface of the ramus at the level of the last molar teeth. 



The stjdo-mandibularis is absent. 



HYOID MUSCLES 

 The mylo-hyoideus is well developed. 



The stylo-hyoideus is very slender, and is inserted into the body of the hyoid 

 bone: it is not perforated by the digastricus. 



Fig. 230. — Superficial Muscles of Dog, After Removal of Panniculus Carnosus. 

 1, Levator nasolabialis; 2, levator labii superioris proprius; 3, dilatator naris lateralis; 4, 4', buccinator; 

 5, retractor anguli oris s. risorius; 6, zygomaticus; 7, malaris; 8, masseter; 9, digastricus; 10, scutularis; 11, 

 other auricular muscles; 12, parotido-auricularis; 13, mylo-hyoideus; 14, sterno-hyoideus; 15, sterno-thyroideus; 

 16, splenius; 17, lumbo-dorsal fascia; 18, rectus abdominis; 19, obliquus abdominis externus; 19' , aponeurosis 

 of preceding; 20, intercostal muscle; 21, sacro-coccygeus accessorius; 22, sacro-coccygeus superior; 23, sacro- 

 coccygeus inferior; ^4. great trochanter; ^-5, jugular vein; a, 6, c, brachio-cephalicus; rf, clavicle; e, /, trapezius; 

 g, serratus cervicis; h, omo-transversarius; ;', latissimus dorsi; k, posterior deep pectoral; /, supraspinatus; 

 TO, m' , deltoid; n, infraspinatus; o, triceps, long head; o', triceps, external head; p, brachialis; </, extensor carpi 

 radialis; r, gluteus medius; s, gluteus superficialis; i, V , tensor fascia^ latse; w, sartorius; r, biceps femoris; r', 

 fascia lata; w, semitendinosus; x, semimembranosus; y, sartorius; z, gracilis; 26, pronator teres; 27 , flexor carpi 

 radialis; 28, flexor carpi ulnaris; 29, tibialis anterior; 30, popliteus; 31, 31', deep digital flexor; 32, superficial 

 digital flexor; S3, gastrocnemius; 34, spine of scapula; a, parotid gland, with a', its duct; /3, submaxillary gland; S, 

 submaxillary lymph glands; ij, parotid lymph gland; C,, inferior buccal glands. (After Ellenberger, m Leisering's 

 Atlas.) 



The hyoideus transversus and omo-hyoideus are absent. 

 The sterno-thyro-hyoideus is large and arises chiefly on the first costal carti- 

 lage. 



Muscles of the Thoracic Limb 



The trapezius is thin, and is not clearly divided into cervical and thoracic 

 portions. Its line of origin extends from about the middle of the neck to the 

 ninth or tenth thoracic spine, the right and left muscles meeting on a median 

 fibrous raphe. 



The omo-transversarius arises by a tendon on the lower part of the spine of 

 the scapula (often partially blended with the trapezius), and is inserted into the 

 wing of the atlas. 



