ANP 1106 Midterm: Anatomy of Nervous system 3 (All you need to know for midterms)

• School: University of Ottawa
• Department: Anatomy and Physiology
• Course: ANP 1106
• Professor: Joanne Savory

Document Summary

Provides links from and to world outside body. Paired spinal and cranial nerves (**does not occur in cns) Bundle of myelinated and nonmyelinated peripheral axons enclosed by ct. Mature neurons are amitoic, but if the soma (cell body) of the damaged nerve is intact, the peripheral axon may regenerate in pns; Endoneurium loose ct that encloses axons and their myelin sheaths. Perineurium coarse ct that bundles ibers into fascicles. Epineurium tough ibrous sheath around a nerve. Cns oligodendrocytes bear growth-inhibiing proteins that prevent cns iber regeneraion. Pns axons can regenerate if damage is not severe. Most nerves are mixtures of aferent and eferent ibers and somaic and autonomic (visceral) ibers. 12 pairs of cranial nerves pass through various foramina of the skull. Mixed nerves both sensory and motor ibers; impulses both to and from cns. First 2 pairs atach to forebrain; rest originate from brain stem. Sensory (aferent) nerves impulses only toward cns.