Changes

===Ox===

===Ox===

Channels 3 and 4 both supply the arterial circle and each has a rete mirable. Channel 2 carries blood away from the arterial circle. A mixture of maxillary and vertebral blood reaches all parts of the brain.

As with the previous species, the blood supply to the circle of Willis is via three main routes; paired internal carotid arteries and a basilar artery. The right side of the brain is similar to that seen in the dog/man or ovine/feline with patent vertebral and maxillary rami with associated rete mirabile. On the left side of the brain the ox is also missing a connection from the occipital artery/external carotid/common carotid to the internal cartoid in the same manner as the ovine/feline physiology. However, where the ovine/feline physiology included only a maxillary ramus, the ox has maxillary and vertebral rami on the left side also, with associated rete mirabile. Therefore the ox has four functional rete mirabile involved in blood supply to the circle of Willis. A mixture of maxillary and vertebral blood reaches all parts of the brain.

 

[[Category:Nervous_System_-_Anatomy_&_Physiology]] [[Category:To_Do_-_A&P]]

[[Category:Nervous_System_-_Anatomy_&_Physiology]] [[Category:To_Do_-_A&P]]