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Muscles by SCI

key muscles by segmental innervation

QuestionAnswer
C1-C2 Facial muscles, partial SCM, capital muscles
C3 SCM, partial diaphragm, upper trapezius
C4 Diaphragmatic, partial deltoid, SCM, upper trapezius
C5 Deltoid, biceps, rhomboids, brachioradialis, teres minor, infraspinatus, serratus anterior
C6 Extensor carpi radialis, pectoralis major (clavicle part), teres major, supinator, serratus anterior, weak pronator
C7 Triceps, flexor carpi radialis, latissimus, pronator teres
C8 Flexor carpi ulnaris, extensor carpi ulnaris, pt. may have some hand intrinsics.
T1-T8 Hand intrinsics, top half of intercoastals, pectoralis major (sternal part).
T7-T9 Upper abdominals
T9-T12 Lower abdominals
T12 lower abdominals, weak quadratus lumborum
L2 Iliopsoas, weak sartorius, weak adductors, weak rectus femoris.
L3 Sartorius, rectus femoris, adductors
L4 Gluteus medius, tensor fascia latae, hamstrings, tibialis anterior
L5 Weak gluteus maximus, long toe extensors, tibalis posterior
S1 Gluteus maximus, ankle plantar flexors (Gastrocnemius, soleus)
S2 Anal Sphincter
Created by: lcurtis