Muscles of the Neck and Back

Question 1

Splenius

Answer 1

O: Vertebrae C7-T6
I: Temporal and occipital bone
A: Acting together extend the head; acting alone head is rotated and bent toward the same side
N: Spinal nerves

Question 2

Sternocleidomastoid

Answer 2

O: Sternum and clavicle
I: Mastoid process of the temporal bone
A: Acting together flex the head; acting alone rotates head toward the opposite shoulder
N: Accessory nerve (CN 9)

Question 3

Semispinalis

Answer 3

O: Vertebrae C7-T12
I: Occipital bone and cervical and thoracic vertebrae (to T4)
A: Extends vertebral column and head rotates to opposite side
N: Spinal nerves

Question 4

Spinalis (most medial)

Answer 4

O: Upper lumbar to lower thoracic vertebrae
I: Upper thoracic to cervical vertebrae
A: Extends vertebral column
N: Spinal nerves

Question 5

Longissimus

Answer 5

O: Lumbar through cervical vertebrae
I: Thoracic through cervical vertebrae and rob
A: Extend and laterally flex vertebral column
N: spinal nerves