intertransversi origin: (a to a and b to b) cervical region: from the anterior tubercle of...
TRANSCRIPT
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
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