Si: matt landry [email protected]
edu: the brain is composed of four major components, brain stem (includes the midbrain, pons, and medulla oblongata, cerebellum (mini brain, cerebrum (major part of the brain, diencephalon (includes the hypothalamus and thalamus) It is a thin layer of areolar connective tissue that is highly vascularized and tightly adheres to the brain: the arachnoid mater lies external to the pia mater. It is a delicate web of collagen and elastic fibers. Immediately deep to the arachnoid mater is the subarachnoid space: the dura mater is an external tough, dense irregular connective tissue layer composed of two fibrous layers. It is the strongest of the three layers: between the arachoid mater and the overlying dura mater is the subdural space. It separates the hemispheres of the cerebrum: the tentorium cerebelli is a horizontal fold of the dura mater that separates the cerebrum from the cerebellum.