A low hemoglobin count can also be due to blood loss, which can occur because of: 1  Bleeding from a wound. 2  Bleeding in your digestive tract, such as from ulcers, cancers or hemorrhoids. 3  Bleeding in your urinary tract.  Frequent blood 1  donation. Heavy menstrual bleeding.
The brain is the control centre for your body and it sits in your skull at the top of your spinal cord. The brain has three main parts. 1  The cerebellum (say se-re-bell-um). The brain stem, that controls a lot of the 'automatic' actions of your body such as breathing and heart beat, and links the brain to the spinal cord and the rest of the body.
The thalamus is typically (depending on the animal) ventral and medial in relation to the cortex, and anterior to the midbrain. It lies just ventral from the third ventricle. Its function is to relay information from the sensory organs (except the olfactory system), the hindbrain, midbrain, and the spinal cord to the cortex, hippocampus and basal ganglia. For example, the lateral geniculate nucleus recieves innervation from the retina and relays it to the visual cortex.