Lecture 11: PNS & Plexuses Flashcards
______ __________ is responsible for movements that are routine. _______________________ ________ sends info from brain to body. ______ modulates motor plans.
Basal ganglia, corticospinal tract, cerebellum.
What are two examples of endogenous pain control? Exogenous?
Spinal cord gate, reticular formation activation. NSAID’s, opitates.
The central H contains _________ and ______. Dorsal horn = _________, ventral horn = ________.
Neuron cell bodies, glial cell bodies, sensory, motor.
What two things connect to form the spinal nerve? What does the spinal nerve split into?
Dorsal root, ventral root. Dorsal rami, ventral rami.
What are dorsal root ganglions?
Clusters of neurons found in dorsal roots.
What is contained in the dorsal rami? Ventral rami?
Deep back muscles, z-joints. Everything else!
What is the intravertebral foramen?
Notches/hole between 2 adjacent vertebrae
What is the conus medullaris? Cauda equina?
Where the spinal cord ends at vertebral level L2. Cauda equina are spinal nerves to help the spinal cord extend further.
What are plexuses?
Where anterior rami merge with each other to create a multi-segmental peripheral nerve = plexus.
What are the three major plexuses?
Cervical, brachial, lumbosacral
Why is there more grey matter in certain locations?
More plexuses are forming, more information is coming/out coming in (connections)
What are the 5 portions of the brachial plexus? (really thirsty? drink cold beer!)
Roots, trunks, divisions, cords, branches
What are the five branches of the brachial plexus?
Radial, axial, musculocutaneous, median, ulnar
Flexion _________ angle of bones between a joint, extension ___________ the angle.
Decreases, increases
What does the axiliary nerve supply? Radial?
Shoulder. Posterior upper limb.
What does the musculocutaneous nerve supply? Ulnar? Median?
Anterior arm. Ant forearm/hand medially. Ant forearm/hand laterally.
Dermatome maps shows what? Peripheral cutaneous?
Dermatome = origin on spinal cord (UMN). Peripheral cutaneous = how it got there (LMN).
How many pairs of spinal nerves in the cervical spine? Thoracic? What is special about the cervical spine?
- Cervical spine is special because there are 7 vertebrae but 8 spinal nerve pairs.
How many pairs of spinal nerves in the lumbar spine? Sacrum/coccyx?
- 5 + 1.
