. The anatomy of the frog. Frogs -- Anatomy; Amphibians -- Anatomy. MUSCLES OF THE HEAD. 61 Fis-. .06. arm of the squamosal, and from the j)osterior and inferior border of the eartilag-inous tympanic ring-. The two parts unite and are inserted into the hinder angle of the lower jaw. Cuvier correctly considers that only the anterior portion corresponds to the digastri- cus, the posterior answering- to the m. cervico-viaxiUaris of snakes. It draws the lower jaw down and opens the mouth. 14. M. temporalis (Figs. 49, 52, ^6, 57 f). Cuvier, m. iemporaUs, I, , p. 138.—Dugès, sous-rupéo-temporo-c
. The anatomy of the frog. Frogs -- Anatomy; Amphibians -- Anatomy. MUSCLES OF THE HEAD. 61 Fis-. .06. arm of the squamosal, and from the j)osterior and inferior border of the eartilag-inous tympanic ring-. The two parts unite and are inserted into the hinder angle of the lower jaw. Cuvier correctly considers that only the anterior portion corresponds to the digastri- cus, the posterior answering- to the m. cervico-viaxiUaris of snakes. It draws the lower jaw down and opens the mouth. 14. M. temporalis (Figs. 49, 52, ^6, 57 f). Cuvier, m. iemporaUs, I, , p. 138.—Dugès, sous-rupéo-temporo-coronoidieii. This muscle, tog-ether with the m. pteryrjouleus, occupies the space between the prootic and the eyeball ; it arises by the greater part of its fibres from the upper surface of the pro- otic ; it passes, narrowdng-, beneath the anterior arm of the squamosal, then over the pterygoid bone, between this and the maxillary and quadrato-jugal, receiving- on the way other fibres which arise from the anterior border of the inferior arm of the squamosal and from the anterior circumference of the tympanic ring. The collected fibres end in a broad, flat tendon, which is inserted into the inner surface of the so- called proc. coTono' iluscles of the lower jaw of Rana esculenta. d >r. deltoideus. n M. depressor maxillae, its origin where covering the m. temporalis reflected at *. Id M. latissimiis dorsi. m M. masseter. ?t M. temporalis, origin. /' Lower portion of same. 15. M. pterygoideus (Figs. 497:1, 52, ST pf)- Cuvier, m. temporalis, II, —Zenker, on. massefericn-t, , p. 25.— Dugès, pré-riipéo-pterygo-maxillaire, 31. This is partly covered by the foreg-oing-, and lies between it and the eyeball. It arises at the inner wall of the orbit from the frontoparietal, and from that portion of the prootic Avhieh may be regarded as the ala magna, above the m. retractor JjidJA. The muscle is broad, and compressed from before backwards : it runs down- wards
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