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SBM Week 1 Neuroanatomy
Brachial Plexus Trunks
Superior Trunk
Suprascapular Nerve
Middle Trunk
Inferior Trunk
1 min
Brachial Plexus Divisions
Anterior (Division)
Posterior (Division)
27 secs
Brachial Plexus Cords
Lateral Cord
Lateral Pectoral Nerve
Posterior Cord
Upper Subscapular Nerve
Thoracodorsal Nerve
Lower Subscapular Nerve
Medial Cord
Medial Pectoral Nerve
Medial Cutaneous Nerve of Arm and Forearm
1 min
Brachial Plexus Branches
Musculocutaneous Nerve
Axillary Nerve
Radial Nerve
Median Nerve
Ulnar Nerve
56 secs
Dermatomes - Cervical
C2 - Posterior Cap Distribution
C3 - High Turtleneck
C4 - Low Collar Shirt
C5 - Anterolateral Shoulder
C6 - Thumb
C7 - Middle Finger
C8 - Pinky Finger
1 min
Dermatomes - Thoracic
Characteristics
T1 - Medial Arm
T4 - Nipple
T7 - Xiphoid
T10 - Belly Button
T12 - Pubis
58 secs
Dermatomes - Lumbosacral
L2 - Medial Thigh
L3 - Medial Knee
L4 - Kneecap, Medial Ankle, and Big Toe
L5 - Dorsum of Foot
S1 - Lateral Foot, Posteriolateral Thigh
S 2, 3, 4, 5 - Perianal and Genitals
2 mins
Anterior Thigh Muscles
Innervation
Femoral Nerve
Muscles
Iliopsoas
Psoas Innervated by L1-3
Sartorius
Pectineus
Quadriceps Femoris
Vastus Lateralis
Vastus Intermedius
Vastus Medialis
Rectus Femoris
2 mins
Neuron Resting Potential
Characteristics
More Na+ Outside
Sodium-Potassium Pump
K+ Leaks Out
More K+ Inside
About -70mV
Voltage-Gated Sodium Channels are Closed
2 mins
Neuron Action Potential Initiation
Characteristics
Summation of Signals
-50 mV Threshold Value Reached
Voltage-Gated Sodium Channels Open
Local Depolarization
Na+ Influx
Potassium Channels open
Repolarization
2 mins
Neuron Action Potential Propagation
Characteristics
Unidirectional Depolarization
Absolute Refractory Period In Preceding Na+ Channels
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