PSL_7030_Questions-Dr._Mateika answered

PSL_7030_Questions-Dr._Mateika answered - Questions (1) The...

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Questions (1) The respiratory rhythm can be recorded from what component of the nervous system? The medulla (2) Under resting conditions is breathing typically controlled voluntarily? No (3) Is the respiratory rhythm generated by an intrinsic pacemaker or a network? Both, by a network in adults, by a pacemaker in neonates (4) What is the difference between a pacemaker and network model of respiratory rhythmogenesis? 1) Network model: 2 inspiratory and 2 expiratory neurons types: 1 expiration on, 1 expiration off. 1 Inspiration on, 1 inspiration off ~ Chemical isolation (blockade) by strychnine/bicucline agents abolishes respiratory control signals originating from network model. 2) Pacemaker model: shown to be possible by chemical isolation (blockade) by strychnine/ bicucline agents, this has no impact on pacemaker origination of respiratory stimuli. (5) What groups are comprised of neurons that discharge during inspiration? DRG : composed solely of inspiratory neurons to the diaphragm VRG rostral : to external intercostals and accessory muscles (6) What groups or complexes are comprised of expiratory neurons? VRG caudal : via expiratory motoneurons to abdominal and internal intercostals Botzinger complex: inhibit inspiratory neurons (7) Name 2 functions of expiratory neurons? Inhibitory (Botzinger complex to phrenic motoneurons) Excitatory (VRG caudal to motoneurons) (8) Once the respiratory rhythm is generated where does it travel? Travels via the spinal column (9) What is the name of the motoneurons that are located in C3-C5 of the spinal cord? The phrenic motoneurons ~ (note: be sure to answer what Jason is asking, do not write “the phrenic nerve” unless he asks “What nerves arises from the axons of motoneurons that originate in level C3 C5 of spinal column?” (10) What is the name of the motoneurons located in the thoracic regions of the spinal cord? VRG caudal : to internal intercostal and abdominal muscles; expiratory T7 T12 VRG rostral : to external intercostal and accessory muscles; inspiratory T1 T7
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(11) What nerves innervate the diaphragm and external intercostal muscles? Diaphragm phrenic nerve External intercostal s external intercostal nerve (12) What are the names of the accessory muscles of inspiration? Sternocleidomastoid and Scalenus muscles (13) Is expiration normally an active or passive process? Passive, by chest wall recoil (14) Name two expiratory muscles. Internal intercostals and abdominals , (via the VRG caudal ) (15) How many generations of branching points are there in the tracheobronchial tree? 23 (16) How many generations of branching points comprise the conducting zone of the tracheobronchial tree? 16 ~ lack alveoli
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This note was uploaded on 12/03/2009 for the course PSL 431 taught by Professor Stephenson during the Spring '07 term at Michigan State University.

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PSL_7030_Questions-Dr._Mateika answered - Questions (1) The...

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