Presentation on theme: "David A. Morton, Ph.D. Jan 10th, 2013"— Presentation transcript:
1David A. Morton, Ph.D. Jan 10th, 2013 BrainstemMidbrain and PonsDavid A. Morton, Ph.D.Jan 10th, 2013
2Objectives Explain how spinal nerves differ from cranial nerves Name all the cranial nerves and know their components and functionsIdentify and locate the CN’s associated with the medulla, pons and midbrainRecognize the major internal and external landmarks on the dorsal and ventral surface of the brain stem, so that you can determine if a gross or stained cross section is medulla, pons or midbrain.Identify on a typical cross section all the brain stem nuclei containing motor neurons that end on striated muscle.List the cranial nerves that contain parasympathetic fibers, the location of their nuclei, and their functionExplain why cranial nerves are so important in localizing lesions.Name reflexes that test these nerves and brain stem levels.Relate branches of the vertebrobasilar blood supply to the medulla and pons explaining the deficits that would occur with vascular occlusion.
19Spinal Cord and Spinal Nerve Review Spinal nerve anatomyDorsal rootSomatic sensory neuronsVisceral sensory neuronsVentral rootVisceral motor neuronsSomatic motor neuronsAlarBasalSulcus limitansSpinal cordSom SVSVMSM
20Internal anatomy of brainstem AlarBasalSulcus limitansSpinal cordSom SVSVMSMThe fate of the alar and basal laminaeWhy are brain stem sensory nuclei lateral to motor nuclei in brainstem?AlarBasalSulcus limitansMedullaSom SVSVMSMBM
34Axons of the sensory part of V Pons (Rostral/Mid)Internal anatomyTrigeminal motor nucleusFunctional significance4th VentricleAxons of the sensory part of VMotor nucleus of VTegmentumR.F.Pons ProperAxons of the motorpart of V
35Pons (caudal) Facial nucleus Branchial motor nucleus Innervate muscles of face
36Pons (caudal) Superior salivatory nucleus Visceral motor (Para) Origin of preganglionic parasympathetic neurons
37Pons (caudal) Abducens nucleus Origin of Abducens n. (CN VI) Homolog to ventral horn
38Pons (caudal) Internal anatomy Facial nucleus Superior salivatory nucleusAbducens nucleus
39Corneal reflex Consensual reflex Sensory: CN V-1 to spinal trigeminal nucleusMotor: Facial nucleus out to the temporal branch of CN VIISpinal trigem.Nucleus & Tract
40Corneal Reflex Touch the cornea L R Semilunar ganglion of CN V Spinal trigeminal nucleusCN V-1LRFacial motor nucleusTemporal branch of CN VIIBlink(Orbicularis occuli muscle)Helpful tutorial:
41Pons Arterial supply. Branches off the: Basilar artery Median and Circumferential branches
42Match the following reflexes with their associated brainstem level: a. corneal reflex testing?b. Gag reflex testing?c. pupillary light reflex testing?IIIIII
43Match the following reflexes with their associated brainstem level: corneal reflex testing?b. Gag reflex testing?c. pupillary light reflex testing?IIIIII
44You have a patient who cannot look to the right with the right eye or smile or wrinkle the right side of their face. Characterize the lesion as to level, side, structure(s) involved.
45You have a patient who cannot look to the right with the right eye or smile or wrinkle the right side of their face. Characterize the lesion as to level, side, structure(s) involved.
46What reflex would be abnormal in a patient with a lesion that included the circled area?
47What reflex would be abnormal in a patient with a lesion that included the circled area? Abducens nucleusFacial nucleus