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Fig. 3. Molecular analysis of chick cloacal muscle development. (A-F) Ventrolateral
views of whole-mount in situ for MyoD on chick embryos at stages
HH25-35 show the development of the cloacal muscles from the ventral muscle
mass of the leg. (A) Ventral muscle mass (arrow) of the hindlimb at HH25. (B)
Elongation of ventral muscle (arrow) mass ventrocaudally towards the cloaca at
HH27. (C) Further elongation of cloacal anlage (arrow) at HH29; the cleavage
of leg muscle mass has started. (D) Cloacal anlage arrives to the vicinity of
cloacal tubercle (arrow) at HH31, note the discontinuity with the anlage of
FCLP and CFC muscles of the leg (arrowhead). (E) Cloacal anlage extends around
the tubercle at HH33 (arrow). (F) Single muscles of the cloacal complex are
discernible at HH35. (G) Pax7 expression at HH27 (arrow). (H) Details
of the Pax7 expression of the proximal limb anlage at HH28, limb has
been removed. Cloacal anlage (arrow) extends from the ventral muscle mass
(cross). Dorsal muscle mass (red arrowhead) began to split into single
muscles. LC, levator cloacae; SCC, m. sphincter circular;
SCS, m. sphincter sling-shaped; TCL, m. transversus
cloacae.
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