Respiratory Appendages 
g Nerve Supply 
Fic. 63.— VENTRAL HALF 
or HEAD-REGION OF AM- 
MOCG@TES, 
Br. cart. 
Somatic muscles coloured 
ted. Branchial and visce- 
ral muscles coloured blue. 
Tubular constrictor mus- 
cles distinguished from 
striated constrictor mus- 
cles by simple hatching. 
Tent., tentacles ; Tent.m.c., 
muco-cartilage of tenta- 
cles; Vel. m.c., muco-car- 
tilage of the velum; Hy. 
m.c., muco-cartilage of the 
hyoid segment; Ps. br., 
pseudo-branchial groove ; 
Br. cart., branchial carti- 
lages; Sp., space between 
somatic and splanchnic 
muscles; Th. op., orifice of 
thyroid; H., heart. 
