Muscles Of The Head And Neck

Question 1

Semispinalis capitis

Answer 1

Origin: articulate process of inferior cervical & transverse process of superior thoracic vertebrae
Insertion: occipital bone
Action: Bilateral extend head, unilateral laterally flexes neck to same side
Innervation: spinal nerves

Question 2

Sternocleiodmastoid

Answer 2

Origin: sternal end of clavicle and manubrium
Insertion: mastoid region of the skull
Action: bilateral- neck flexion, unilateral- turns face to opposite side
Innervation: accessory nerve (CN XI)

Question 3

Splenius Capitis

Answer 3

Origin: Spinous process/ligaments of cervical vertabrae
Insertion: mastoid process, occipital bone of skull
Action: bilateral- extends head, unilateral- laterally flexes neck to same side
Innervation: cervical spinal nerves

Question 4

Longissimus cervicis

Answer 4

Origin: transverse process of the superior thoracic vertebrae
Insertion: transverse process of middle and superior cervical vertebrae
Action: bilateral- extend head, unilateral- laterally flexes neck to same side
Innervation: cervical and thoracic spinal nerves

Question 5

Longissimus thoracis

Answer 5

Origin: transverse process of all thoracic and lumbar vertebrae
Insertion: transverse process of all thoracic vertebrae
Action: bilateral-extension of spine, unilateral-lateral flexion of spine
Innervation: thoracic and lumber spinal nerves

Question 6

Thyrohyoid

Answer 6

Origin: thyroid cartilage of larynx
Insertion: hyoid bone
Action: elevates thyroid, depresses hyoid bone
Innervation: hypoglossal nerve

Question 7

Scalenes(anterior, middle, posterior)

Answer 7

Origin: Transverse processes of C2-C7
Insertion: first and second ribs
Action: elevates ribs 1 &2
Innervation: cervical spinal nerves