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Plexus and spinal cord.docx - Video 1: T1-T12 do not form a...

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Video 1:T1-T12 do not form a plexus- no network fibers, just one nerve that innervates the ribs (Thoracic nervesare sympathetic)Cervical plexus- Nerves from cervical vertebrae C1- C55 major nerves:First 4 nerves pass through sternocleidomastoid (only visible muscle in neck left and right side)1.Lesser Occipital nerve: C2 - innervates posterior and superior scalp2.Greater auricular nerve: C2, C3 Innervates both surfaces of ear and parotid glands3.Transverse cervical nerve: C2, C3 innervates the anterior portion of the neck4.Supraclavicular nerve: C3, C4 innervates the superior region of the neck, chest, and shoulders C3-C45.Phrenic nerve: innervates the diaphragm, major muscle of respiration (most important). Expandsthoracic cavity to allow lungs to fill up with air.C3-C5.Breaking those vertebrae could cause breathingissues or kill someone by cutting off the nerve supply to the diaphragm which causes a person to beunable to breathe.How is cervical plexus is formed?By C1-C5 cervical vertebraePlexusis a network of nerve fibers.Video 2:Roots: vertebrae C1-C5Loops: Each of roots come down and make three cords and then the branches. The roots are joining.Video 3:Roots, trunks (divisions under clavicle), division, Cords.Roots (C5, C6) (C7, C8), and T1Lateral cord, (c5, C6) and trunks (superior)Posterior cord, (C7, C8), and trunksMedial cord (C8, T1)What are the nerves that come together to make cervical plexus?C5-C8, and T1.Dorsal scapular nerve: innervates rhomboid major and minorLong thoracic C5-C7: innervates serratus anterior muscle
Superior trunk nerves:Suprascapular nerve: Innervates on top of scapula- Supraspinatus, infraspinatusSubclavius nerve:Divisions:no branches after themCords:divisions coming togetherAnterior:anterior compartment musclesPosterior:Posterior compartment muscles5 terminal nerves: (brachial plexus) My Aunty Raped My Uncle (know the root numbers)Sensory and motor neurons for the arm forearm and hand C5-C8 and T11.Musculocutaneous-Anterior, serves biceps brachi, brachialis, and coracobrachialis muscles2.Axillary- Posterior, Root (arm, forearm, and hand) Deltoid and teres minor3.Radial- Posterior, Root (arm, forearm, and hand) extensors on forearm and supinator4.Median- lateral and medial cords (anterior), all other flexors and pronator mm5.Ulnar- comes off medial cord (anterior), Root (arm, forearm, and hand) flexor carpi ulnaris and intrinsicmm of hand. Flexor digitorum profundus.*All ventral rami come from the brachial plexus*5 Posterior cord nerves (sacral plexus): ULTRA1.Upper (superior) subscapular -most proximal (1)2.Lower(inferior) subscapular – after thoracic dorsal(3)3.Thoracodorsal- after upper (2)4.Radial-then (4)5.Axillary- then (5)Video 4: Lumbosacral plexus (SIPP and S4)Roots: L4,L5, S1,S2, and S3
Thesciatic nerve – L4,L5, S1,S2, and S3 innervates posterior muscles of the thigh (most important nerve)has two branches sciatic and obturator nervesSuperior Gluteal nerve: L4, L5, S1 (most important L5)Inferior gluteal nerve: L5, S1, S2 (primarily S1)- Gluteus maximus

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