Volume 1

On the anatomy, physiology, and pathology of the chimpanzee / by Charles F. Sonntag.

  • Sonntag, Charles F. (Charles Frederick), -1925
Date:
1923
Catalogue details

Licence: In copyright

Credit: On the anatomy, physiology, and pathology of the chimpanzee / by Charles F. Sonntag. Source: Wellcome Collection.

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    the depression on the temporal bone corresponding to the digastric fossa in Man. Chaine (10) has recently described the digastric muscle. The tendon of the posterior belly tunnels the stylo-hyoid muscle; it has no direct attachment to the hyoid bone as described by Gratiolet (22). Some fibres of omo-hyoid and sterno-hyoid pass into the anterior bellies of the digastrics. The stylo-hyoid arises by one large and several small tendons from the styloid process and bone around. It is long, thin, fleshy, and wrapped round the digastric tendon. It is inserted into the upper border of the hyoid bone opposite sterno-hyoid and omo-hyoid. The mylo-hyoid (text-fig. 31, M-H) arises from the upper- border of the hyoid bone under cover of, but never fused with. Text-figure 31. Anatomy of the submental region (No. 1). A.B.I) : anterior belly of tlie digastric turned down; A.F.V: anterior facial vein ; E.J.V : external jugular vein; L.B.T: lingual nerve; P.B.D: posterior belly of the digastric; P.F.V: posterior facial vein; S.M.Gr: submaxillary gland; Sy.H : stylo-hyoid muscle; W.D : Wharton’s duct. Other letters in text. the anterior belly of the digastric. The level of origin corre- sponds to the extent of the insertions of the sterno-hyoid and omo-hyoid on the posterior border. The fibres radiate to be inserted into the inner surface of the mandible. The posterior fibres lie just in front of the submaxillary gland. Lying on the surface of the muscle and supplying it are branches of the sub- maxillary twigs of the external maxillary artery. I did not observe any decussation of fibres in the middle line as described by G-ratiolet (22). No submental lymphatic glands were found behind the symphysis menti. The genio-hyoid muscles (text-fig. 31,Gr-H) are separated anteriorly close to their origins from the lower part of the genial fossa on the back of the symphysis menti. In the greater part of [12]
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