Table 1.

LBWM subdivisions and domains

Name and locationMorphology and distributionTermination in the head regionLikely functionsInnervationOther names
Band A: most ventralThe branch A1 splits from band A in the head region; band A courses anteriorlyBand A(1) Ventral head structures: ventral part of the mouth, the oral veil, and ventral tentacleHead turning, oral
veil, and tentacle movements
Branch A1, after
detaching, muscles fascicles become flatter and wider
Most caudal end of ventral and lateral oral tube, just anterior to the buccal massProboscis retraction, mouth openingMouth nerveMuscle 3 (Davis et al., 1973); muscle 23 (Lee and Liegeois, 1974)
Band B: dorsal to band A(2) Lateral head structures: lateral part of the oral veil, the mouth; the base of the rhinophore; and dorsal (caudal) tentacleHead movement,
and turns
Anterior region: nerve branches from P2; posterior region: branches from pLBWN (left), PGC (right)None
Band C: dorsal to band BAs the muscles course toward the head region, three branches detach: the first one is branch C1, the second is branch C2, and the third is branch C3Band C(3) Dorsal head structures: dorsal part of the oral veil, the mouthHead, mouth
Nerve branches from aLBWN, pLBWN (PGC), maybe BWN alsoSee muscle 30 (Lee and Liegeois, 1974)
Branch C1, flat and wide (small portions of it come off from band B)Caudal end of the dorsal oral tubeProboscis extension and withdrawal (feeding)(LOVN)Muscle 29 or 28 (Lee and Liegeois, 1974)
Branch C2, the point it detaches is medial to the eyeAnterior region of the dorsal buccal massWithdrawal of the buccal mass (feeding)(SOVN)Muscle 2 (Davis et al., 1973); muscle 22 (Lee and Liegeois, 1974)
Branch C3, flat and wideRostral end of the ventral oral tube and the mouthNone, but see muscle 32 (Lee and Liegeois, 1974)