Rare case of the inferior mesenteric artery and the common hepatic artery arising from the superior mesenteric artery.

We found a case in which inferior mesenteric artery and the common hepatic artery arose from the superior mesenteric artery, forming the common hepatomesenteric trunk, during a routine dissection carried out at Iwate Medical University in 2002. This variation is rare, but can be embryonically explained. A change in the positions of the disappearance of the ventral splanchnic arteries and the longitudinal anastomotic channel results in variations in the system of arteries distributed to the digestive organs. In the present case, the longitudinal anastomotic channel between the superior and the inferior mesenteric arteries survived to form the common mesenteric artery, which was joined by the common hepatic artery, forming the common hepatomesenteric trunk.

Abnormal anterior belly of the digastric muscle: a proposal for the classification of abnormalities.

We recognized an abnormal anterior belly of the digastric muscle in an 83-year-old male cadaver. Three muscle bundles were observed on the left anterior belly: (i) attached to the left digastric fossa; (ii) attached to the right digastric fossa; and (ii) attached to the raphe of the mylohyoid muscle. Four muscle bundles were recognized on the right anterior belly: (i) attached to raphe of the mylohyoid muscle; (ii, iii) attached to the exterior surface on the base of the mandible from the raphe of the mylohyoid muscle; and (iv) attached to the interior surface on the base of the mandible from the raphe of the mylohyoid muscle. The raphe of the mylohyoid muscle was curved significantly to right and the four abnormal bundles found on the right anterior belly (see above) were attached to its curved point.