BIO 255L Week 7 Questions and Answers

BIO 255L Week 7 Questions and Answers Electrical potentials are summed in the neuron and if they reach a threshold, an action potential is conducted away from the cell body starting at this structure Axon Hillock Axons from other neurons synapse mostly with these structures Dendrites What is the name of the glial cells that wrap around the axon? What is the name of the structure these cells form? Schwann Cells (neurolemmocytes) in PNS, or Oligodendrocytes in CNS; They form the myelin sheath In myelinated axons, action potentials "jump" between which structures? Nodes of Ranvier (Neurofibril Nodes) The epidural space is between which two structures? Vertebrae and Dura mater Is the Ventral Root an equivalent term to the Anterior Root or Posterior Root? Anterior root. Which term is equivalent to the Dorsal Root? Posterior root List the Meningeal layers from Superficial to Deep Dura mater, Arachnoid mater, Pia mater Longitudinal Fissure: Does this follow the transverse, coronal, or sagittal plane? Sagittal Central Sulcus: What direction does the sulcus run: Anterior to Posterior or Medial to Lateral? Which plane does it follow? Medial to Lateral. Coronal. Lateral Sulcus: What direction does the sulcus run: Anterior to Posterior or Medial to Lateral? Which plane does it follow? Anterior to Posterior. Transverse. Pre-central Gyrus—What important functional area of the brain is located in the Pre-central Gyrus? Primary Motor Cortex Post-central Gyrus— What important functional area of the brain is located in the Post-central Gyrus? Primary Somatosensory Cortex. What type of Section (cut) is required to see the Corpus callosum? Is it made of white or grey matter? Sagittal. White matter. Choroid Plexuses—Where do you find the Choroid Plexuses? What is their function? Ventricles. Produce Cerebral Spinal Fluid. Cerebellum—Can you view the Cerebellum from an anterior view? No Pons—When looking at a sagittal section of the brain, how is the Pons identified? It is a bulge on the Brian stem that protrudes anteriorly. Medulla Oblongata—Is the Medulla superior or inferior to the Pons? Inferior. Which lobes cannot be seen in a mid-sagittal section? Temporal and Insula. Which lobe is most posterior? Occipital. Which brain area is found deep to the lateral sulcus? Insula. Which lobe(s) are completely posterior to the central sulcus? Parietal and Occipital. Frontal. Sensory nerves CN I—Olfactory CN II—Optic CN VIII—Vestibulocochlear Motor nerves CN III—Oculomotor CN IV—Trochlear CN VI—Abducens CN XI—Accessory CN XII— Hypoglossal Sensory and motor nerves CN V—Trigeminal CN VII—Facial CN IX—Glossopharyngeal CN X—Vagus Which Nerve is involved with the sense of smell? CN I—Olfactory Which Nerve is involved with the sense of vision? CN II—Optic Which Nerve is involved with hearing and balance? CN VIII—Vestibulocochlear Which Nerve(s) move the eye? CN III—Oculomotor CN IV—Trochlear CN VI—Abducens Which Nerve(s) move the head? CN XI—Accessory Which Nerve(s) are involved with chewing? CN V—Trigeminal Which Nerve(s) are involved with taste? CN VII—Facial CN IX—Glossopharyngeal Which Nerve(s) are involved with swallowing? CN IX—Glossopharyngeal CN X—Vagus CN XII— Hypoglossal Which Nerve(s) are involved with speech? CN IX—Glossopharyngeal CN X—Vagus CN XII— Hypoglossal Which Nerve controls facial expression? CN VII—Facial Which Nerve transmits facial cutaneous sensation? CN V—Trigeminal Which Nerve has parasympathetic control on your heart, lungs, and abdominal organs? CN X— Vagus.