The brainstem consists of the midbrain, the pons, and the medulla oblongata. It is divided into the midbrain, pons, and medulla oblongata. These fibers terminate at the medulla oblongata. The brainstem consists of the medulla, the pons and the midbrain. This results in the infarction of medial part of the medulla oblongata. The myelencephalon gives rise to the medulla oblongata. Vomiting can also occur due to compression of the vomiting center in the medulla oblongata. It includes the medulla, pons, and cerebellum. Each gland has an outer cortex which produces steroid hormones and an inner medulla. These effects are the result of activation of 5-HT receptors within the rostral ventrolateral medulla. It receives inhibitory GABAergic input from the caudal ventrolateral medulla (CVLM). Each follicle consists of a cortex that surrounds a medulla. The adrenal medulla () is part of the adrenal gland. There is no parasympathetic stimulation to the adrenal medulla. Pheochromocytomas are tumors of the adrenal medulla that arise from chromaffin cells.