aeo 



THE MUSCLES OF THE PIG 



Muscles of the Neck 



The cutaneus consists of two layers which cross each other obliquely. The 

 fibers of the superficial layer are directed nearly vertically, those of the deep laj'er 

 toward the face, on which they are continued to form the facial portion. 



The brachiocephalicus is described 'VAdth the other muscles of the shoulder girdle. 



The stemo-cephalicus arises on the sternum and is inserted by a long round 

 tendon on the mastoid process. 



The thyroid part of the stemo-thyro-hyoideus has a peculiar arrangement. 

 It arises (separately from the opposite muscle) on the manubrium sterni. About 

 the middle of the neck it has an oblique tendinous intersection, beyond which it 



Fig. 316. — Superficial Muscles of Pig, After Removal op M. Cutaneus. 

 a, Levator nasolabialis; h, levator labii superioris proprius; h' , fleshy slip of b which comes from premaxilla; c, 

 dilatator naris lateralis; rf, depressor rostri; e, orbicularis oris; /, depressor labii inferioris; ff, zygomaticus; /t, masseter; 

 i i', i", brachiocephalicus (cleido-occipitalis, cleido-mastoideus, pars^clavicularis deltoidei) ; k, sterno-cephalicus; /, 

 sterno-hyoideus; m, omo-transversarius ; n, n' , trapezius; o, anterior deep pectoral; p, latissimus dorsi; g, lumbo- 

 dorsal fascia; r, obliquus abdominis externus; r', aponeurosis of r; s, serratus dorsalis; i, serratus ventralis; w, posterior 

 deep pectoral; r, supraspinatus ; w, w', deltoideus; x, long head of triceps; y, lateral head of triceps; z, tensor fascice 

 antibrachii; 1, brachialis; ;?, extensor carpi radiahs; S, extensor digiti quarti; 4. extensor digiti quinti; S, extensor 

 carpi ulnaris; 0, ulnar head of deep flexor; 7, gluteus medius; S, tensor fascite lat£e; 9, 10, 10', biceps femoris; 11, 

 semitendinosus; 12, semimembranosus; 13, caudal muscles; 14, panniculus adiposus in section. (After Ellenberger, 

 in Leisering's Atlas.) 



divides into two branches: one of these is inserted in the usual fashion, the other 

 ends on the laryngeal prominence. The hyoid part is well developed. 



The om.o-hyoideus is thin. It arises as in the horse, but has no connection 

 with the brachiocephalicus nor with the opposite muscle. 



The omo-transversarius arises on the first or second cervical vertebra (under 

 cover of the brachiocephalicus), and is inserted into the lower part of the scapular 

 spine. 



There are two scaleni. The scalenus ventralis (s. primse costae) resembles 

 that of the ox, is attached to the last four cervical vertebrae, and is perforated by 

 the nerves of the brachial plexus. The scalenus dorsalis (s. supracostalis) arises 

 on the transverse processes of the third to the sixth cervical vertebra, and ends 

 on the third rib. 



The ventral muscles of the head present no special features. 



The longus colli is separated from the opposite muscle, so that part of the 

 bodies of the cervical vertebrae is exposed as in man. 



