. Anatomy, descriptive and applied. Anatomy. THE BUCCAL It EG ION 375 upper lip. Other fibres of the muscle, situated at its upper and lower part, pass across the lips from side to side without decussation. Superficial to this stratum is a second, formed by the Levator and Depressor anguli oris, which cross each other at the angle of the mouth, those from the Depressor passing to the upper lip, and those from the Levator to the lower lip, along which they run to be in- serted into the skin near the median line. Li addition to these there are fibres from the other muscles inserted into the lips

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. Anatomy, descriptive and applied. Anatomy. THE BUCCAL It EG ION 375 upper lip. Other fibres of the muscle, situated at its upper and lower part, pass across the lips from side to side without decussation. Superficial to this stratum is a second, formed by the Levator and Depressor anguli oris, which cross each other at the angle of the mouth, those from the Depressor passing to the upper lip, and those from the Levator to the lower lip, along which they run to be in- serted into the skin near the median line. Li addition to these there are fibres from the other muscles inserted into the lips
Library Book Collection / Alamy Stock Photo
Image ID: RN5AGR
. Anatomy, descriptive and applied. Anatomy. THE BUCCAL It EG ION 375 upper lip. Other fibres of the muscle, situated at its upper and lower part, pass across the lips from side to side without decussation. Superficial to this stratum is a second, formed by the Levator and Depressor anguli oris, which cross each other at the angle of the mouth, those from the Depressor passing to the upper lip, and those from the Levator to the lower lip, along which they run to be in- serted into the skin near the median line. Li addition to these there are fibres from the other muscles inserted into the lips—the Levator labii superioris, the Levator labii superioris alaeque nasi, the Zygomatici, and the Depressor labii inferioris; these intermingle with the transverse fibres above described, and have principally an oblique direction. The proper fibres of the lips are oblique, and pass from the under surface of the skin to the mucous membrane through the thickness of the lip. In addition to these are fibres by which the muscle is connected directly with the maxilla and mandible and with the septum of the nose. Li the upper lip these consist of two bands, an inner and an older, on each side of the nasal plane; the outer band (m. incisivus superior) arises from the alveolar border of the maxilla, opposite the lateral incisor tooth, and, arching outward on each side, is continuous '•e:vatoh. *ryBUCCINATOF» E. A. S. Fig. 293.—Plan of the fibres constituting the Orbicularis nuscle. at the angle of the mouth with the other muscles inserted into this part. The inner band (m. nasolabialis) connects the upper lip to the septum of the nose. The interval between the two inner bands corresponds with the depression called the philtrum seen on the surface of the skin beneath the septum of the nose. The additional fibres for the lower lip (in. incisivus inferior) arise from the mandible, externally to the Levator menti, and arch outward to the angles of the mouth to join the Buccinator and

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