PNS Exam 2
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Degeneration of the spinal cord inferiorly forms what anatomical structure?
Nerves generally emerge above the cervical vertebrae, except at which level?
C8: emerges below C7.
Which levels are lumbar punctures taken from?
L3/4 or L4/5.
Which layer contains trebeculae?
Where does the dural sac (spinal dura) end?
What ligament is an extension of the dural sac?
True or false: ventral rootlets are generally motor.
Which levels contain the lumbar cistern?
L2 - S2.
- Innervate muscles & skin of the anterior trunk.
- Carry autonomic innervations.
- Are bigger than dorsal rami.
What is an a/k/a for nerve root compression?
- Pain in muscles.
- Cutaneous sensory loss.
- Motor weakness.
- Loss of tendon reflexes.
True or false: brachial plexus roots consist of anterior rami.
- Passing between the anterior & middle scalenes.
Dorsal scapular nerve (C4, C5):
- Pierces the middle scalene.
- Innervates rhomboid minor/major, & levator scapula.
Long thoracic nerve (C5, C6, C7):
Innervates serratus anterior.
The superior trunk gives off which nerves?
- 1. Nerve to the subclavius.
- 2. Suprascapular nerve.
Which cord does the inferior (lower) trunk make up?
Which cord is the anterior division of the superior & middle trunks?
The lateral cord.
Does the lateral pectoral nerve (C5, C6, C7) supply pectoralis major or pectoralis minor?
Which muscle is pierced by the musculocutaneous nerve (C5, C6, C7)?
- Coracobrachialis: innervates the muscles of the anterior arm, & skin of the lateral forearm.
- Passes between the biceps brachii & the brachialis.
What is the anterior division of the inferior trunk?
The medial & lateral cords make up which nerve?
- The median nerve (C6, C7, C8, T1).Innervates the muscles of the anterior forearm, 5 intrinsic muscles on the lateral half of the palm, & the skin of the palm.
Which nerve runs with the ulnar nerve?
The medial brachial cutaneous nerve (C8, T1).
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