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Fig. 2. Schematic summary of the movements of the entire buccal mass during a
biting cycle. This summary is based on the data presented in this paper and
incorporates observations from in vivo high-temporal-resolution MR
images in intact, behaving animals as well as high-spatial-resolution MR
images of anesthetized buccal masses. Details not visible in the MR images are
based on observations of buccal masses or isolated odontophores undergoing
pharamacologically induced feeding-like movements, as well as from dissections
of fresh and fixed buccal masses. All illustrations are in orthographic
projection. (A) Row shows a superficial lateral view of the outer buccal mass.
Fiber directions of the thin, overlying I1 muscle are schematically indicated
(see Fig. 12A). (B) Row shows
a mid-sagittal view. (C) Row shows a dorsal view. The upper half of each panel
shows a superficial dorsal view, whereas the lower half shows a view in which
the radular surface and the I4 muscles are transparent, revealing the ventral
structures beneath them. Columns 1-6 correspond to frames 53, 56, 60, 63, 68,
71 of sequence 3222 (respectively). The circumferential muscle shown in C2 was
designated as such by Starmühlner
(Starmühlner, 1956). The
nomenclature for the other intrinsic muscles (I1 through I10) follows Howells
(Howells, 1942) and Evans et
al. (Evans et al., 1996), and
the nomenclature for the extrinsic muscles (E1-E3 and E6) follows Chiel et al.
(Chiel et al., 1986) and
Howells (Howells, 1942).
Compare with fig. 21 of Neustadter et al.
(Neustadter et al.,
2002b).
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