5 8 The Anatomy <?/ ^ H O R S E. Chap. V. 



Iht inner Ear, The firft of the tvvo Mufcles of the inner 

 ''"''''• Ear, called Externum Tympani Juris^ or 



the external Mufcles of the Drum of the Ear, becaufe it 

 moves that Membrane upwards, arifes from the upper 

 Part of the Paflagc of the Ear, and becoming narrower, 

 it grows into a very fine and fmall Tendon, which runs 

 along the outfide of the Drum, and is inferted into its 

 Center over the Hammer, which, along with the Drum, 

 it draweth upwards and outwards. 



The Internus, or inner Mufcles, takes its Rife from the 

 bottom of the Wedge-like Bone, where it joins to the Pro- 

 cejftis Petrofiis ; it lies within the Ca\-ity of that Bone, 

 and at its middle is divided into two very fmall Tendons, 

 ■whereof one is inferted into the upper Procefs of the Ham- 

 mer, and the other into the Neck of it. The Ufe of this 

 Mufcle alone is to draw the Head of the Hammer oblique- 

 ly forwards, and alfo to bring it fomewhat inwards ; but 

 when they adl both together, they move the Tympanum 

 with its imall Bones upwards and downwards. This 

 A6tion is performed as often as an Animal attentively 

 Mens to any approaching Noife, 



^. V. Of the Mufcles cf the Tongue^ and Os Hyoides> 

 l/i;ith thcfe of the Larynx, Uvula, and Throat. 



*The Tongue, The Tgngue has five Pair of Mufcles 



five Pair of proper to itfelf, befides thofe that are com- 

 Mujcles, pion to it and the Os Hyoides. 



The iiril Pair are called the Gcmoglojum, becaufe they 

 ?.rife from the Chin in Men, and are inferted in the 

 Tongue. In a Horfe they arife from the Riiggednefs on 

 the middle of the lower Jaw ; in the inner and lower Part 

 of it they have feveral fuch Infcriptions as thofe on - the 

 lUeight Mufcles of the Paunch, and are inferted into the 

 lower Side of the middle of the Tongue. Their Ufe is td 

 move the 7'ongue forwards j which Adion is frequently 

 performed by Horfes when they gather their Meat. 



The fecond Pair, called TpftlogJojJian^ becaufe they arife 

 ' from the bottom of the Os tiyoides: They are inferted in 

 the middle of the Tongue, and in their Adion are contra- 

 ry to the former, by drawing it backwards. 



The Mykgloffmiy or third Pair, arife from the inner 

 Part of the lower Jaw, at the Roots of the fartheft grind- 

 ing Teeth, and are inferted into the Ligament which tiej 



the 



