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NMS 1: PNS Quiz 1
Question | Answer |
---|---|
What is the brachial plexus formed from | Ventral Primary Rami |
What are true muscles | Those acting directly upon the spinal column |
What are true muscles innervated by | The Dorsal Primary Rami |
What types of neurons are in peripheral nerves | -A complete complement of somatic motor, somatic and visceral sensory and sympathetic fibers -NO parasympathetic fibers |
Sympathetics from superior cervical ganglion go to what nerve roots | C1-4 |
Sympathetics from middle cervical ganglion go to what nerve roots | C5-6 |
Sympathetics from inferior/stellate ganglion go to what nerve roots | C7-8,T1 |
Where do the roots of the brachial plexus receive their sympathetic components | As they pass between the scalene muscles |
Posterior division (branches of posterior cord) of brachial plexus innervates? | Extensors of the arm, forearm, wrist and fingers -Brachioradialis is an exception |
Anterior division (branches of lateral and medial cord) of brachial plexus innervates? | Flexors of the arm forearm, wrist and fingers |
Groups from the supraclavicular branches | -Those arising from the roots of the brachial plexus -Those arising from the trunks of the brachial plexus |
Nerves arising from the roots of the brachial plexus | -Dorsal scapular nerve (C4) C5; posterior division -Long Thoracic nerve C5,6,7 (C8); posterior division |
Dorsal Scapular nerve outlet Muscle, action and test | -C5 -Rhomboids major and minor -Retraction of the scapulae; full extension of arms -Position of Attention |
Long thoracic nerve Outlet muscle, action and test | -C5,6,7 -Serratus Anterior -Protraction of the scapulae; lateral rotation; upward rotation of scapulae -"reaching"; pushing against wall |
Nerves arising from the trunks of the brachial plexus | -Nerve to the subclavius C5,6; anterior division -Suprascapular nerve C5 to supraspinatus Anterior division -Suprascapular nerve C5,6 to infraspinatus Anterior division |
Nerve to subclavious Outlet muscle, action and test | -C5,6 -Subclavius -protection of subclavian artery; depression of clavicle -NO TEST |
Suprascapular Nerve Outlet muscle, action and test | -C5 -Supraspinatus -Abduction of the humerus -Pressure applied against abduction |
Suprascapular Nerve Outlet muscle, action and test | -C5,6 -Infraspinatus -lateral rotation of the humerus -pressure applied against external rotation |
Lateral pectoral nerve outlet, muscle, action and test | -C5,6,7 -Pectoralis Major upper and lower fibers -Upper = flex and medially rotate shoulder; Lower=depress shoulder girdle and obliquely adduct humerus -upper=pressure applied against internal rotation and flexion; lower= pressure against adduction |
Medial pectoral nerve outlet, muscle, action and test | -C8, T1 -Pectoralis minor and lower fibers of Pectoralis major -Tilts scapula anteriorly and downward -No test |
Upper (short) subscapular outlet, muscle, action and test | -C5,6 -Subscapularis -Medial rotation of the humerus, joint stabilization -Pressure applied against internal rotation |
Thoracodorsal outlet, muscle, action and test | -C6,7,8 -Latissimus Dorsi -Internal rotation, extension adduction -Pressure applied against shoulder extension |
Lower subscapular Nerve outlet, muscle, action and test | -C5,6 -C6=teres major; C5=Subscapularis -C5 and 6=Internal rotation, extension, weak adductor -Apply pressure against internal rotation and extension |
Spinal portion XI, ventral rami outlet, muscle, action and test | -C3,4 -Trapezius -Retraction, rotation, depression, elevation -Shoulder shrug for upper fibers; position of attention for middle |
Nerve to levator scapulae outlet, muscle, action and test | -C3,4 -Levator scapulae -elevation -shoulder shrug |