Figure 4
Transverse sections of histological examinations of the muscle fibers attached to the fMCs. (A) In a transverse section at the distal aspect of the fMCs, some muscle fibers were found just posterior to the fMCs. (B) Enlarged view of the rectangular area in panel A. Some muscle fibers crossing each other were found at the posterior site between the fMCs. Since the crossing fibers ascended obliquely and superomedially toward the fMC on the contralateral side, the crossing fibers just posterior to fMCs appeared as cut fibers. Arrowheads indicate the crossing fibers of the left DSN toward the right fMC. Arrows indicate the crossing fibers of the right DSN toward the left fMC. (C) In a superior transverse section of the fMCs of the nose, some muscle fibers of the left and right DSNs coursed obliquely and medially. (D) Enlarged view of the rectangular area in panel C. Some lateral muscle fibers (arrows) of the right DSN were located adjacent to the posterolateral aspect of the right fMC. Some medial muscle fibers of the left and right DSNs (black arrowheads) coursed obliquely and medially. The DAN (white arrowheads) was located just lateral to the DSN, attached to the vestibular skin. Ant anterior, Lat lateral.
