BIOL373 Study Guide - Final Guide: Oncotic Pressure, Angiotensin Ii Receptor Blocker, Lateral Corticospinal Tract
22 Aug 2016
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Cephalization: bilateral symmetry of nerves throughout the whole body. Primitive brain: collection of neurons in one area. Neural crest cells: cells migrating throughout the body contributing to sensory, motor, and peripheral systems. 4 weeks: appearance of forebrain, midbrain, and hindbrain. 6 weeks: midbrain differentiates into diencephalon and cerebrum, hindbrain differentiates into medulla, cerebellum, and pons. 11 weeks: growth of cerebrum, hiding the diencephalon underneath, no longer tube like. Birth: cerebrum dominates, huge undulations due to fast growth but limited space, apparent cranial nerves. Cranial and spinal meninges from the inside to outside: Sub arachnoid space: between arachnoid membrane and pia mater, contains blood vessels and arachnoid trabeculae resembling sticky webs. Choroid plexus: patch of ependymal cells within each ventricle that secretes csf. Ependymal cells: barrier between ventricular surface, they selectively decide the composition of the csf. Cerebrospinal fluid (csf): replaced 4 times a day to clean out metabolites and toxins, extremely low protein level and has no blood cells.
