Action.—Pulls the concha dorsocraniad.
(c) The remainder of the muscles of the ear interconnect parts of the auricular cartilage.
M. transversus auriculæ ([Fig. 63], i).—A band about six to eight millimeters wide, on the medial convex surface of the auricle, between the distal ends of M. levator auris longus (g′) and M. auricularis superior (k).
Origin on the medial surface of the concha, just proximad of the furrow which corresponds to the antihelix. The muscle bridges this furrow, passes distad about two centimeters, and is inserted on the auricular cartilage on a line which forms a caudal continuation of the line of insertion of the levator auris longus (g′).
Relations.—Outer surface with the levator auris longus (g, g′), the auricularis superior (k), and the integument; inner surface with the auricular cartilage.
Action.—Flexes the scapha mediad on the concha, thus enlarging the external opening of the concha.
M. auricularis externus ([Fig. 169], 10; [Fig. 64], r).—This consists of small scattered bands of interrupted fibres on the convex surface of the auricle, caudad of the transversus auriculæ. The largest of these bands runs parallel with the transversus auriculæ about five or six millimeters caudad of the latter. It has origin on the eminentia conchæ distad of the insertion of the abductor auris longus. Thence the fibres run distad five or six millimeters and are interrupted by an attachment to the cartilage. Distad the fibres begin again, and the muscle runs thence distad for about one centimeter, the distal end being attached to the cartilage.
Caudad of this, especially of its proximal portion, are one or two small bands of fibres usually running parallel with it, but unconnected with it and with each other. The extent and distribution of these bands varies, and the direction of fibres is also variable.
Relations.—Outer surface with the integument; inner surface with the auricular cartilage.
Action.—Flexes the auricular cartilage.