Human Vertebrae and their Arrangement into the Spinal Column

Human Vertebrae and their Arrangement into the Spinal Column

The shape of a vertebra and its function (spatial)

Segmental Spinal Cord Level and Function

Level

Function

C1-C6

Neck flexors

C1-T1

Neck extensors

C3, C4, C5

Supply diaphragm (mostly C4)

C5, C6

Shoulder movement, raise arm (deltoid); flexion of elbow (biceps);

C6

externally rotates the arm (supinates)

C6, C7

Extends elbow and wrist (triceps and wrist extensors); pronates wrist

C7, T1

Flexes wrist

C7, T1

Supply small muscles of the hand

T1 -T6

Intercostals and trunk above the waist

T7-L1

Abdominal muscles

L1, L2, L3, L4

Thigh flexion

L2, L3, L4

Thigh adduction

L4, L5, S1

Thigh abduction

L5, S1, S2

Extension of leg at the hip (gluteus maximus)

L2, L3, L4

Extension of leg at the knee ...