Evans_Back and Head Muscles Flashcards
Rectus Capitis Posterior
major
O: C2 spinous process
I: occipital bone (inferior nuchal line, middle third)
A: Bilat- extends the head
Unilat- rotates head to same side
Innervation: C1 (posterior ramus= suboccipital nerve)
Rectus Capitis Posterior
minor
O: C1 spinous process
I: occipital bone (inferior nuchal line, inner third)
A: Bilat- extends the head
Unilat- rotates head to same side
Innervation: C1 (posterior ramus= suboccipital nerve)
Longus Capitis
O: c3-6 transverse process and anterior tubercles
I: Occiptal bone (basilar part (ANTERIOR)
A: bilat: flexes head
Uni: tilts and slightly rotates head to same side
Inner: Direct branches of cervical plexus (c1-c3)
Longus Cervicis
Vertical part
O: C5-T3 anterior sides of vertebral bodies
I: c2-c4 (anterior sides of vertebral bodies)
A:
bi-lateral: flexes cervical spine
unilateral: tilts and rotates cervical spine to same side
Inner: direrct branches of cervical plexus (c2-c6)
Obliquus Capitis
superior
O: C1 transverse process
I: Occipital bone (inferior nuchal line inner third)
A.
bi: extends head
uni: titls head to same side, roates to opposite side
INNER: c1 (posterior ramus= suboccipital nerve)
Obliquus Capitis
Inferior
O: c2 spinous process
I: C1 transverse process
A. occipital bone
bi: extends head
uni: titls head to same side, roates to opposite side
inner: c1 (posterior ramus= suboccipital nerve)
Longus Cervicis
Superior obique part
O: c3-C5 transverse processes, anterior tubercles
I: C1 (transverse process, anterior tubercle)
A.
bi-lateral: flexes cervical spine
unilateral: tilts and rotates cervical spine to same side
INNER: direrct branches of cervical plexus (c2-c6)
Longus Cervicis
Inferior Oblique part
O: T1-T3 anterior sides of vertebral bodies
I: C5-C6 (transverse processes anterior tubercles)
A.
bi-lateral: flexes cervical spine
unilateral: tilts and rotates cervical spine to same side
INNER: direrct branches of cervical plexus (c2-c6)
Rectus Capitis Anterior
O: C1 Lateral Mass
I: Occipital bone (basilar part) anterior
A: Bilateral: flexion at atlantoccipital joint
Unilateral: lateral fextion at atlanto0occipital joint
Iner: c1 ventral ramus
Rectus Capitis Lateralis
O: C1 transverse process
I: same?
A: Bilateral: flexion at atlantoccipital joint
Unilateral: lateral fextion at atlanto0occipital joint
Iner: c1 ventral ramus
Scalene Muscles
Anterior
O: c3-c6 (anterior tubercles of transverse processes)
I: 1st rib (scalene tubercle)
A:with ribs Mobile: elevates upper ribs (during forced inspiration)
With ribs Fixed: bends cervical spine to same side (unilaterl), flexis neck (bilateral)
Inervation: Direct branches from cervical and brachial plexuses (C3-C8)
Scalene muscles
Middle
O: c1-c2 Transverse processes; c3-c7 posterior tubercles of transvers processes
I: 1st rib (posterior to groove for subclavian artery)
With ribs Fixed: bends cervical spine to same side (unilaterl), flexis neck (bilateral)
Inervation: Direct branches from cervical and brachial plexuses (C3-C8)
Scalene Muscles
Posterior
O: c5-c7 posterior tubercles of transverse processes
I:2nd rib (outer surface)
With ribs Fixed: bends cervical spine to same side (unilaterl), flexis neck (bilateral)
Inervation: Direct branches from cervical and brachial plexuses (C3-C8)
Serratus Posterior
superior
O:
Nuchal ligament;C7-T3 (spinous processes)
I: 2nd- 4th ribs (superior borders)
A: Elevates Ribs
N: Spinal nerves (T2-T5)
serratus posterior
inferior
O: T11-L2 (spinous processes)
I: 8th- 12th ribs (inferior borders, near angles)
A: depresses Ribs
N: Spinal nerves (T9-T12)