Intertransversi Origin: (A to A and B to B) cervical region: from the anterior tubercle of transverse process from the posterior tubercle of transverse.

Intertransversi

Origin: (A to A and B to B)

cervical region:

from the anterior tubercle of transverse process

from the posterior tubercle of transverse process

thoracic region: (poorly developed)

lumbar region:

lateral aspect of the transverse process

mamillary process

Insertion:

cervical region:

to the anterior tubercle immediately above

to the posterior tubercle immediately above

thoracic region: (poorly developed)

lumber region:

lateral aspect of the transverse process immediately above

to the accessory process on the vertebra immediately above

Action:

laterally flexes each respective pair of vertebrae

(also eccentric muscle contraction provides stability)

Blood: muscular branches of the aorta

Nerve: dorsal rami of spinal nerves

Intertransversi

Intertransversi

Intertransversi

Obliquus Capitis

Obliquus capitis inferior Origin: spinous process of axis (C2)

Insertion: transverse process of atlas (C1)

Action: rotates the head to the contracted side

Blood: muscular branches of vertebral artery

Nerve: suboccipital nerve, (dorsal rami C1)

Obliquus capitis superior Origin: transverse process of atlas (C1)

Insertion: between superior and inferior nuchal line of occiput

Action:

bilaterally extends the head

laterally flexes to the contracted side

Blood: muscular branches of vertebral artery

Nerve: suboccipital nerve, (dorsal rami C1)

Obliquus Capitis Inferior and Superior

Obliquus Capitis Superior

Obliquus Capitis Inferior

Obliquus Capitis Inferior and Superior

3 = obliquus capitis superioris 4 = obliquus capitis inferioris

Longus Colli & Longus Capitis

Longus colli Origin: lower anterior vertebral bodies and transverse processes

Insertion: anterior vertebral bodies and transverse processes several segments above

Action: flexes the head and neck

Blood: muscular branches of the aorta

Nerve: ventral rami C2-C6

Longus capitis Origin: upper anterior vertebral bodies and transverse processes

Insertion: anterior vertebral bodies and transverse processes several segments above

Action: flexes the head and neck

Blood: muscular branches of the aorta

Nerve: ventral rami C1-C3

Longus Colli & Longus Capitis

Longus Colli & Longus Capitis

Longus Capitis Longus Colli

Sternocleidomastoid

Origin: (two heads)

manubrium of sternum

medial portion of clavicle

Insertion: mastoid process of temporal bone

Action:

rotates to side opposite of contraction

laterally flexes to the contracted side

bilaterally flexes the neck

Blood:

occipital artery

superior thyroid artery

Nerve:

motor: spinal accessory (XI cranial)

sensory: ventral rami of C2,(C3)

Sternocleidomastoid

Sternocleidomastoid

Sternocleidomastoid

Platysma

Origin: subcutaneous skin over delto-pectoral region

Insertion: invests in the skin widely over the mandible

Action:

depress mandible and lower lip

tenses the skin over the lower neck

Blood: superficial vessels of the neck

Nerve: cervical branch of facial nerve (VII cranial)

Platysma

Platysma

Platysma