What muscles Flex the neck?
Sternocleidomastoid
Anterior Scalene
What muscles extend the neck?
Trapezius (upper fibres)
Levator Scapulae
Splenius Capitis
Splenius Cervicis
What muscles rotate the neck to the same side?
Levator Scapulae
Splenius Capitis
Splenius Cervicis
What muscles rotate the neck to the opposite side?
Trapezius (upper fibres) Sternocleidomastoid Anterior Scalene Mid Scalene Posterior Scalene
What muscles laterally flex the neck?
Trapezius (upper fibres) Levator Scapulae Sternocleidomastoid Anterior Scalene (if ribs are fixed) Mid Scalene (if ribs are fixed) Posterior Scalene (if ribs are fixed) Splenius Capitis Splenius Cervicis
O and I of Sternocleidomastoid
O =
I =
O and I of Anterior Scalene
O =
I =
O and I of Trapezius (upper fibres)
O =
I =
O and I of Levator Scapulae
O =
I =
O and I of Splenius Capitis
O =
I =
O and I of Splenius Cervicis
O =
I =
O and I of Mid Scalene
O =
I =
O and I of Posterior Scalene
O =
I =