Sternocleidomastoid
Has large belly with 2 heads, one on clavicle and one on sternum.
Origin- Sternal Head: Top of manubrium
Clavicular Head: Medial one-third of the clavicle
Insertion- Mastiod process of the temporal bone and the lateral portion of the superior nuchal line of the occiput
Actions- Unlaterally: Laterally flex the head and neck to the same side, rotate the head and neck to the opposite side
Bilaterally: Flex the neck, assist to elevate the ribcage during inhalation
Origin- Sternal Head: Top of manubrium
Clavicular Head: Medial one-third of the clavicle
Insertion- Mastiod process of the temporal bone and the lateral portion of the superior nuchal line of the occiput
Actions- Unlaterally: Laterally flex the head and neck to the same side, rotate the head and neck to the opposite side
Bilaterally: Flex the neck, assist to elevate the ribcage during inhalation