chapter 9 neck and trunk muscles Flashcards
the origin, insertion, action of Sternoclavicmastoid
O:Sternum and clavicle
I: Mastoid process
A: Bilaterally: flexes neck
Unilaterally: laterally bends the neck, rotation to opposite side
the origin, insertion, action of scalene
O: Transverse processes of cervical vertebrae
I: Ribs 1 and 2
A:Bilaterally: assists neck flexion
Unilaterally: lateral bending of the neck
define the Prevertebral Muscles
Anterior neck muscles
Deep
Postural control primarily
Role in head or neck flexion
what are the four neck muscles of prevertebral
A.Rectus capitis lateralis
B.Rectus capitis anterior
C.Longus capitis
D.Longus colli
the function of subocciptal muscles
Work together to either extend the head with a rocking motion of the occipital condyles on the atlas
Or
to rotate the head to the same side by pivoting the skull and atlas around the odontoid process of the axis
the origin, insertion, action of splenius capitis
O:Lower half of nuchal ligament, spinous processes C7-T3
I: Lateral occipital bone, mastoid process
A: Bilaterally - extend head
Unilaterally - rotate and laterally flex to the same side
the origin, insertion, action of splenius crevices
O: Spinous processes T3-T6
I:Transverse processes C1-C3
A:Bilaterally - extend head & neck
Unilaterally - rotate and laterally flex to the same side
the origin, insertion, action of rectus abdominis
O: Pubis
I: Costal cartilage of ribs 5-7
A:Trunk flexion; compression
of abdomen
the origin, insertion, action of external oblique
O:Lower 8 ribs laterally
I: Iliac crest and linea alba
A:Bilaterally: trunk flexion, compression of abdomen
Unilaterally:lateral flexion; rotation to opposite side
the origin, insertion, action of traverse abdominis
O: Inguinal ligament, iliac crest, thoracolumbar fascia and last six ribs
I: Abdominal aponeurosis and linea alba
A: Compression of abdomen
the origin, insertion, action of internal oblique
O:Inguinal ligament, iliac crest, thoracolumbar fascia
I: Ribs 10-12, abdominal aponeurosis
A:Bilaterally: trunk flexion, compression of abdomen
Unilaterally: lateral flexion; rotation to SAME side
the origin, insertion, action of erector spinae
O: Spinous processes, transverse processes, and ribs from the occiput to the sacrum and ilium
I: same as origin
A: Bilaterally: extend
Unilaterally: laterally bend
the origin, insertion, action of tranverspinalis
O: Transverse processes
I: Spinous processes of vertebra above
A: Bilaterally: extend
Unilaterally: rotate to opposite side
the origin, insertion, action of quadratus lumborum
O: Iliac crest
I: Rib 12, transverse processes, L2-L5
A: Trunk lateral bending, hip
hiking or elevation
