Elements of the comparative anatomy Elements of the comparative anatomy of vertebrates elementsofcompar00wied Year: 1886 FIG. 97.—LATERAL MUSCLES-OF Ainphioxus. D, dorsal, and 7', ventral portions ; M, J/, the individual myotonies ; QB, transverse muscles of abdominal region ; C, cirrhi; F, F1, tail-fin. Mo JLM T Da / Me* V Ma FIG. 98. — THE ENTIRE MUSCULATURE OF Siredon pisciformis. LI, lateral line ; D, dorsal, ', ventral portion of caudal muscles; -ZZJ/, dorsal portion of lateral muscles of the trunk ; 0, 0, outermost layer of the external oblique muscle, arising from the lateral l
Elements of the comparative anatomy Elements of the comparative anatomy of vertebrates elementsofcompar00wied Year: 1886 FIG. 97.—LATERAL MUSCLES-OF Ainphioxus. D, dorsal, and 7', ventral portions ; M, J/, the individual myotonies ; QB, transverse muscles of abdominal region ; C, cirrhi; F, F1, tail-fin. Mo JLM T Da / Me* V Ma FIG. 98. — THE ENTIRE MUSCULATURE OF Siredon pisciformis. LI, lateral line ; D, dorsal, ', ventral portion of caudal muscles; -ZZJ/, dorsal portion of lateral muscles of the trunk ; 0, 0, outermost layer of the external oblique muscle, arising from the lateral line, and extending to the fascia, F ; at * a piece of this layer is removed, exposing the second layer of the muscle (!,) ; at Re the oblique fibres of the latter pass into longitudinal fibres, indicating the beginning of the differentiation of a rectns ahdominis ; at //• ' the reetns-system is seen passing to tin- visceral skeleton ; Me, fibrous partitions between the myo- tomes of the dorsal portion of the lateral museh-s ; 7\ temporal : J/</, masseter : Dg, digastric; .17//1, mylohyoid (posterior portion): \ external ceratnhynid muscle; Lv, levator arcuum branchialium ; fH-, Irvator branchiarum ; //, cervical origin of the constrictor of the. pharynx ; Th, tliymus gland latissimus dorsi ; !>*, dorsalis scapulae ; i'n, cucullaris ; procoraco-humeralis. /./, 1, snprascapula ; /'//, The cranio-visceral musculature is to be looked upon as having been derived out of the lateral muscles in consequence of the development of the visceral skeleton. It may be asserted as a general rule that the dorsal portion of the lateral muscles of the trunk,-1— except in the caudal region,
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