Anatomy

Anatomy & Histology

Vision

Hearing & Balance

NECK

CHEST

Spinal Cord

Spinal cord tracts [Wikimedia Commons]

Spinal Nerve

Actions of the spinal nerves
Level Motor Function
C1C6 Neck flexors
C1T1 Neck extensors
C3, C4, C5 Supply diaphragm (mostly C4)
C5, C6 Move shoulder, raise arm (deltoid); flex elbow (biceps)
C6 externally rotate (supinate) the arm
C6, C7 Extend elbow and wrist (triceps and wrist extensors); pronate wrist
C7, C8 Flex wrist; supply small muscles of the hand
T1T6 Intercostals and trunk above the waist
T7L1 Abdominal muscles
L1L4 Flex thigh
L2, L3, L4 Adduct thigh; Extend leg at the knee (quadriceps femoris)
L4, L5, S1 abduct thigh; Flex leg at the knee (hamstrings); Dorsiflex foot (tibialis anterior); Extend toes
L5, S1, S2 Extend leg at the hip (gluteus maximus); Plantar flex foot and flex toes

Note: Unless otherwise indicated, images are in the Public Domain (for the most part, Wikimedia Commons).

Reading

Advertisements