Pnb 2xb3 - Study guides, Class notes & Summaries

PNB 2XB3 FULL Study Guide with Complete Solutions A-alpha conduction velocity? - Answer-80-120 m/s A-beta conduction velocity? - Answer-35-75 m/s A-delta conduction velocity? - Answer-5-30 m/s C-fibers conduction velocity? - Answer-0.5-2 m/s A-alpha axon diameter? - Answer-13-20 microns A-beta axon diameter? - Answer-6-12 microns A-delta axon diameter? - Answer-1-5 microns C-fibers axon diameter? - Answer-0.2-1.5 microns Synaptic cleft width? - Answer-20-40 microns Number of neurons i...

PNB 2XB3 - Midterm 2: Somatosensory Exam Study Guide with Complete Solutions Merkell cells - Answer-- slowly adapting - 25% of mechanosensory afferents in hand - highest spatial resolution - edges, points, corners, curvature - static indentation ** Meissener - Answer-- rapidly adapting -40% of mechanosensory innervation in hand - skin motion, indentation, low frequency vibrations for textured objects*** - more than 4x more sensitive than Merkell to skin deformation, but larger recepti...

PNB 2XB3 Lecture 4: Somatosensory System Exam Study Guide with Complete Solutions dermatome - Answer-the area of skin supplied by the sensory axons of a single spinal nerve dorsal horn - Answer-the POSTERIOR column of grey matter in the spinal cord (shape differs depending on spinal segment) - contains SENSORY neuron cell bodies ventral horn - Answer-the ANTERIOR column of grey matter in the spinal cord (shape differs depending on spinal segment) - contains MOTOR neuron cell bodies 3 ty...

PNB 2XB3 - Auditory System Study Guide with Complete Solutions Sound waves are ___; compression is __ of a wave, rarefaction is ___ - Answer- longitudinal - move like a slinky; top; bottom Period - Answer-the time taken for one up-down cycle (wavelength) Wavelength - Answer-the distance b/w two peaks/an up-down cycle Universal wave equation - Answer-speed = distance/time = wavelength/period Higher pitch = - Answer-higher frequency - but perception depends on the environment Sound freque...

PNB 2XB3 Neuroscience Midterm Review Study Guide with Complete Solutions Central Nervous System (CNS) - Answer-all parts of the nervous system within bone (spinal cord, brainstem, thalamus, cortex, etc) Peripheral Nervous System (PNS) - Answer-all parts not within bone (spinal nerves, cranial nerves) Cranial nerve - Answer-One of twelve pairs of nerves arising from the brainstem that carry sensory information towards the central nervous system Spinal nerve - Answer-A nerve which carries...

PNB 2XB3 - Central Vision Practice Questions and Answers | 100% Pass For an on-center ganglion cell, what causes it to maximally fire? - Answer-light in the center and darkness in the surround What is the spontaneous level of activity or baseline for a ganglion cell? - Answer- when the entire field is in the dark color opponency - Answer-the center and surround cones can be of different types (red,green,blue...) fixating the eyes on an object - Answer-turning the eyes so that the image f...

PNB 2XB3 - Vestibular and Motor System Questions and Answers |100% Pass What are the three ways in which the head can rotate in? - Answer-Yaw: z axis (saying no) Pitch: y axis (saying yes) Roll: x axis What are the semicircular canals filled with? - Answer-endolymph What is the vestibular labyrinth composed of? what are the functions of each? - Answer-- utricle and saccule: detect head tilt and linear acceleration - semicircular canals: detect head rotation What are the two otholith o...

PNB 2XB3 - Neural Development Exam Study Guide with Complete Solutions Mitosis - Answer-process of one cell dividing in two (Embryonic) Stem Cells - Answer-precursors to all types of cells Pluripotent - Answer-potential to become any type of cell Ectoderm - Answer-brain and skin (outer layer) Mesoderm - Answer-muscle, blood, bone, cartilage (middle layer) Germline - Answer-sperm and eggs Endoderm - Answer-lung, gut, and liver (inside layer) Day 18 of gestation - Answer-neural plate deve...

PNB 2XB3: Neuroanatomy and Neurophysiology Exam Questions And Answers