PSYC 2307 Lecture Notes - Lecture 2: Foramen Magnum, Dura Mater, Pia Mater
19 Jan 2017
School
Department
Course
Professor
Document Summary
Grey matter: neuron cell bodies and/or unmyelinated axons. Nucleus: concentration of cell bodies in the cns. Ganglion: concentration of cell bodies in the pns. Tract: concentration of axons in the cns. Nerve: concentration of axons in the pns. Decussation: axons that project to the contralateral side. Hemidecussation: half the neurons cross over the contralateral side. Efferent: directed away from the brain (motor nerves) Afferent: directed toward the brain (sensory nerves) Somatic nervous system: afferent and efferent connections via cranial and spinal nerves. Pad: encase the brain and spinal cord in 3 layers. Pia mater (delicate membrane that blood vessels pass through to irrigate the brain), arachnoid space (contains blood vessels and lymphatic structures), dura mater (very tough; closest to the skull) Ependymal cells: a type of glial cell that produces csf. Cerebrospinal fluid (csf): does not circulate like blood, but is absorbed and replenished every 8 hours or so.
