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18 Cards in this Set
- Front
- Back
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What is the Cervical Plexus of Nerves?
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-formed from the ventral rami of C1-4
-Superficial, deep & communicating branches |
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Superficial branches of Cervical Plexus
What is not part of CP but a part of innervating? |
ALL SENSORY (most in post. triangle)
Ascending: -Lesser occipital C2-3 -Great auricular C2-3 -Transcerse cervical (ant. cutaneous nerve of neck / C2-3) Descending: -Supraclavicular nerves C3-4 CNXI: Accessory (spinal) -Trap & SM |
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Where do dorsal rami go?
Where do ventral rami go? |
DR: to the deep muscles of the back, and skin over back
VR: visceral & somatic (rest of body) |
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Deep branches of the Cervical Plexus
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ALL MOTOR
-nerve to geniohyoid-C1 (ride on CNXII) -nerve to thyrohyoid-C1 (ride CN XII) C1=sup root of ansa cervicalis -nerve to the sup belly of omohyoid-C1 (via sup. root of ansa) C2&C3 = inf root of ansa cervicalis -nerve to sternothyroid-C1-3 (via inf root of ansa) -nerve to sternohyoid-C1-3 (via inf root of ansa) -nerve to inf belly of omohyoid-C2-3 (via inf. root of ansa) Deep branch not associated w/ ansa -Phrenic nerve C3-5 -Nerve to rectus capitis lateralis-C1-2 -Nerve to rectus capitis ant-C1-2 -Nerve to longus capitis-C1-4 -Nerve to longus colli-C2-8 -C3&4 contribute to innerv. of levator scap & mid scalene |
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Why communicating branches from CP with Spinal Accessory Nerve XI?
Why communicating branches from CP with Sympathetic ganglia? |
Proprioreceptive feedback: as SCM contracts it's important for spinal cord and telling body what the neck is doing, the location and what body is doing.
WCR & GCR in ventral rami allow sympathetic to innervate inside of T1->L2. Can go to somatic smooth muscle(erector pili, sweat glands, and BV) in neck bc cervical plexus via connecting GCR on all other levels. |
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Summary of all neck innervation.
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Leftovers:
Platysma – Facial Nerve VII Sternocleidomastoid – Spinal Accessory XI Trapezius – Spinal Accessory XI Mylohyoid – Trigeminal - V3 Stylohyoid – Facial VII Digastric – anterior belly – V3, posterior belly – VII Splenius Capitis – Dorsal rami of cervical nerves |
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Patterns of Cervical Plexus nerve innervation from spinal levels?
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-Things higher up get innervation from spinal levels higher up.
-Things lower down get innervation from spinal levels lower down. -Shorter things get innervation from fewer spinal levels. -Longer things get innervation from more spinal levels. |
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Where BP emerges to get to posterior triangle?
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-emerges between anterior and middle scalene
-formed from ventral rami C5-T1 |
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What does Vagus innervate in neck?
What are its branches? |
-anterior triangle & root of neck
-Pharyngeal: to pharyngeal plexus -Superior laryngeal nerve: internal laryngeal nerve (general sensory to larynx) & External laryngeal nerves (branchial motor to 1 muscle) -Recurrent laryngeal nerves: branchial motor to other muscles (loopes under arch of aorta on left & subclavian artery on right to ascend back to larynx) |
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Glossopharyngeal nerve branching into neck?
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-found in submandibular & carotid triangles
-Branchial motor to stylopharyngeus -Viseral sensory from: pharynx, carotid body (chemoreceptor, O2 levels), Carotid sinus (pressure sensor) |
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Sympathetic Chain
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-deep in anterior triangle & root of neck
-found in carotid subtriangle -3 cervical chain ganglion: sometime fused w/ 1st thoracic gang from cervicothoracic (stellate) ganglion) -Middle cervical ganglion: smallest of 3 cervical ganglia -Superior cervical ganglion: often largest |
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Do Cervical Sympathetic Ganglia Have WCR?
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No
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Nerves in Posterior Triangle
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Spinal Accessory nerve XI
Roots of brachial plexus-Suprascapular nerve Cervical Plexus- Lesser Occipital nerve, Great Auricular nerve, Transverse Cervical nerve, Supraclavicular nerves, Phrenic nerve |
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Nerves in Anterior Triangle
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Cervical Plexus- Transverse Cervical nerve, Ansa Cervicalis and branches
Hypoglossal nerve Vagus nerve- Superior Laryngeal nerve, Internal Laryngeal nerve, External Laryngeal nerve Glossopharyngeal nerve Sympathetic chain |
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Nerves in root of neck
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Vagus- Recurrent Laryngeal nerves
Phrenic- Sympathetic chain & gang |
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What does the Aortic Arch split into?
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Left Loose= Left Subclavian & Left Common Carotid
Right Tight = Brachiocephalic Trunk, 2 branches (subclavian artery & common carotid (right)) |
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What are the branches of subclavian?
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-Vertebral Artery: headed for head
-Internal thoracic artery: into thorax -Thyrocervical Trunk: Inferior Thyroid artery (Ascending cervical branch, Inferior laryngeal branch, pharyngeal branches), Suprascapular artery, Transverse cervical artery |
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