Laboratory Exercise III:

Squalus acanthias

Body cavities and mesenteries:

*parietal peritoneum, *visceral peritoneum

Dorsal mesentery: *greater omentum, *gastrosplenic ligament, *mesentery (narrow sense), *mesocolon

Ventral mesentery: *falciform ligament, *ostium tubae, *lesser omentum, *hepatoduodenal ligament, *gastrohepatic ligament

Others: *mesorchium, *mesovarium, *mesotubarium

Digestive system:

teeth, oral cavity, tongue, *pharynx, spiracle, internal gill slits, *esophagus, stomach (cardiac and pyloric regions), *pyloric sphincter, papillae, *rugae, duodenum, valvular intestine, *spiral valve, rectum, *cloaca, *rectal gland

Accessory digestive organs: *liver (right, left, median lobes), *gall bladder, *common bile duct, *pancreas (both lobes), isthmus, pancreatic duct, *spleen

Respiratory system:

Internal gill slits: gill chamber, parabranchial chamber, *gill rakers, *gill arch

Gills: interbrancial septum, *gill rays, *primary gill filaments, secondary gill filaments, hemibranchs, pseudobranch

Circulatory system:

Heart and arteries: *sinus venosus, *atrium, *ventricle, *conus arteriosus, *ventral aorta, *afferent branchial arteries

Note: do not dissect the heart- a model will be provided to visualize the internal structure of the shark heart

Heart model: chambers, *sinoatrial valve, *atroventricular valve, *semilunar valves

Efferent branchial arteries, dorsal aorta, and its branches: collector loop (pretrematic branch, posttrematic branch; expose one set), *efferent branchial arteries, *dorsal aorta, hyoidean, *internal carotid artery, *intersegmental arteries, *subclavian arteries, *coeliac artery, *ovarian/testicular arteries, *gastrohepatic artery, *pancreaticomesenteric artery, *gastric, *hepatic, *anterior intestinal artery, *intraintestinal arteries, *anterior mesenteric, *gastrosplenic artery, *posterior mesenteric artery, *caudal artery, *renal arteries,

Venous system:

Portal systems:

Renal portal system: *caudal vein, *renal portal veins

Hepatic portal system: *hepatic portal vein, *gastric vein, *lienomesenteric vein, *pancreaticomesenteric vein, *anterior intestinal vein

Systemic veins: *posterior cardinal veins, *posterior cardinal sinus, *lateral abdominal veins, *intersegmental veins, *anterior cardinal sinuses

* Know function (use lab text as a guide).  For mesenteries & suspensory ligaments, a complete "function" would include the organs it spans.  For blood vessels, a complete “function” would include the organ(s) to which it supplies blood or from which it drains blood, and the anatomical direction through which blood flows.