Editing Dendrobranchiata (section)

===Internal anatomy===
Most of the [[muscle|musculature]] of a prawn is used for bending the pleon, and almost all the space in the pleon is filled by muscle.<ref name="TM113">[[#TavaresMartin2010|Tavares & Martin, 2010]], p. 113</ref> More than 17 muscles operate each of the pleopods, and a further 16 power the tail fan in the rapid backward movement of the [[caridoid escape reaction]].<ref name="TM113-114">[[#TavaresMartin2010|Tavares & Martin, 2010]], pp. 113–114</ref> These muscles, collectively, are the meat for which prawns are commercially fished and farmed.<ref>[[#KanduriEckhardt2002|Kanduri & Eckhardt, 2002]], p. 42</ref>

The [[nervous system]] of prawns comprises a dorsal [[brain]], and a [[ventral nerve cord]], connected by two [[commissure]]s around the [[oesophagus]].<ref name="TM114">[[#TavaresMartin2010|Tavares & Martin, 2010]], p. 114</ref> The chief sensory inputs are visual input from the eyes, [[chemoreceptor]]s on the antennae and in the mouth, and [[mechanoreceptor]]s on the antennae and elsewhere.<ref name="TM116-8">[[#TavaresMartin2010|Tavares & Martin, 2010]], pp. 116–118</ref>

The [[digestive system]] comprises a foregut, a midgut and a hindgut, and is situated dorsally.<ref name="TM118">[[#TavaresMartin2010|Tavares & Martin, 2010]], p. 118</ref> The foregut begins at the mouth, passes through the oesophagus, and opens into a sac that contains the grinding apparatus of the [[gastric mill]].<ref name="TM118"/> The [[hepatopancreas]] feeds into the midgut, where [[digestive enzyme]]s are released, and nutrients taken up.<ref name="TM118"/> The hindgut forms faecal pellets, which are then passed out through the muscular [[anus]].<ref name="TM118-9">[[#TavaresMartin2010|Tavares & Martin, 2010]], pp. 118–119</ref>

The [[circulatory system]] is based around a compact, triangular [[heart]], which pumps blood into three main [[artery|arteries]].<ref name="TM120">[[#TavaresMartin2010|Tavares & Martin, 2010]], p. 120</ref> [[Excretion]] is carried out through the gills, and by specialised [[gland]]s located at the base of the antennae, and is mostly in the form of [[ammonia]].<ref name="TM120-1">[[#TavaresMartin2010|Tavares & Martin, 2010]], pp. 120–121</ref>