ANTERIOR SCALENE Scalene muscle of the neck
Origin:
• Transverse process of C3-C6
Insertion:
• 1st rib
Action:
• Bilaterally: flex cervical vertebrae &
elevate 1st rib
• Unilaterally: laterally flex and rotate
cervical vertebrae
MIDDLE SCALENE Scalene muscle of the neck
Origin:
• Transverse process of C2-C7
Insertion:
• 1st rib
Action:
• Bilaterally: flex cervical vertebrae &
elevate 1st rib
• Unilaterally: laterally flex and rotate
cervical vertebrae
POSTERIOR SCALENE Scalene muscle of the neck
Origin:
• Transverse processes of C4-C6
Insertion:
• 2nd rib
Action:
• Bilaterally: flex cervical vertebrae &
elevate 2nd rib
• Unilaterally: laterally flex and rotate
cervical vertebrae
Origin:
• Transverse process of C3-C6
Insertion:
• 1st rib
Action:
• Bilaterally: flex cervical vertebrae &
elevate 1st rib
• Unilaterally: laterally flex and rotate
cervical vertebrae
MIDDLE SCALENE Scalene muscle of the neck
Origin:
• Transverse process of C2-C7
Insertion:
• 1st rib
Action:
• Bilaterally: flex cervical vertebrae &
elevate 1st rib
• Unilaterally: laterally flex and rotate
cervical vertebrae
POSTERIOR SCALENE Scalene muscle of the neck
Origin:
• Transverse processes of C4-C6
Insertion:
• 2nd rib
Action:
• Bilaterally: flex cervical vertebrae &
elevate 2nd rib
• Unilaterally: laterally flex and rotate
cervical vertebrae