38 ANATOMY OF VERTEBRATES. 



its fibres are attached to the capsular ligament. 21 is the ' rotulo- 

 condylar ligament ; ' 22 the ' rotular ligament ; ' 23 the ' external 

 rotular ligament; ' 10 the e condylo-fibular ligament ; ' 15 the ' ex- 

 ternal semilunar cartilage;' 25 the ' calcaneal ligament ;' 26, 26, the 

 * external lateral ligaments ' of the ankle and succeeding joints ; 

 27 the ' ant-oblique ligament ; ' 28 the ligament from the outer 

 splint-bone (metatarsal iv) to the sesamoid behind the metacarpo- 

 phalangial joint : ss and 39 are cartilages of the hoof. 



Muscles of the hyoid arch. The ' sterno-hyoideus ' and the 

 ' sterno-thyroideus ' form a single muscle, Avhich divides to be 

 inserted into both the larynx and os hyoides. The ' omo- 

 hyoideus,' fig. 11, a, is a very strong muscle. The f stylo- 

 hyoideus ' furnishes a sheath to the longer portion of the digas- 

 tricus, and extends from the furcate extremity of the stylohyal to 

 the base of the thyrohyal. There is also a f cerato-hyoideus ' 

 extending between the thyrohyal and the thyroid cartilage. The 

 ' paroccipito-styloideus ' is a short thick muscle, derived from the 

 paroccipital, whence it descends toward the angle of the stylo- 

 hyal, into which it is inserted, above the origin of the stylo- 

 hyoideus. 



Facial muscles. The ( occipito-frontalis ' has the usual origin 

 from the posterior part of the cranium, whence, running forward, 

 it covers the skull with its tendinous aponeurosis, and, in front, 

 spreads in muscular slips upon the forehead, some of which, 

 fig. 11, 12, extend downward, to spread over those of the orbicu- 

 laris palpebrarum. 



Situated upon the outer side of the orbit there is another 

 descending slip of muscle derived from the lateral cartilage of the 

 ear, which, by elevating the external canthus of the eye, con- 

 tributes to the expression of that organ. 



The f levator anguli oris,' fig. 11, n, is inserted into the upper 

 lip and margin of the nostril : it has two origins, derived from the 

 surface of the superior maxillary bone, between which the lateral 

 dilator of the nostril and upper lip passes to its destination. The 

 ' zygomaticus ' is a depressor of the external angle of the eye, as 

 well as an elevator of the corner of the mouth, its fibres being 

 intermixed with those of the orbicularis palpebrarum, as well as 

 of the orbicularis oris. 



The f long dilator of the nostril, and elevator of the upper lip ' 

 arises at a little distance below the inferior margin of the orbit ; 

 and, passing between the two origins of the levator anguli oris, 

 terminates in a tendon, which becomes connected with that of the 

 opposite side, and then spreads out in front of the upper lip. 



