40 terms

Back Muscles O & I

muscles of the back origins and insertions along with their innervations
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Terms in this set (...)

Semispinalis Capitus Origin, Insertion and action?
Origin: Articular Process of C4-C6 and Transverse process of T1-T7, C7

Insertion: Occiptal Bone

Acting bilaterally: back extension
Acting Unilaterally: rotation to opposite side
Semispinalis Cervicus Origin, Insertion and action?
Origin: Transverse Process of T5,T6

Insertion: Spinous process C1-C5

Acting bilaterally: cervical extensions
Acting unilaterally: rotation to opposite side
Semispinalis thoracis Origin, Insertion and action?
Origin: Transverse process of T6-T10

Insertion: Spinous process of C6 - T4

Action: back extension
Spinalis Thoracis Origin, Insertion and action?
ORigin: Spinous process of L1, L2, T11-T12

Insertion: SPinous process of T1-T8

Action: Extension of the back
Spinalis Cervicis Origin, Insertion, Action?
Origin: SP C7, ligamentum Nuchae and SP of T1, T2

Insertion: SP of axis, SP of C3-C4 (occasionally)

Action: Bilaterally it extends the neck
Spinalis Capitis Origin, Insertion and action?
Origin: Blended with semispinalis capitis
Inserion: Spinous process of T1-T4, C6, C7
Action: back extension
Longissimus Capitis Origin, Insertion and action?
Origin: By tendons from TP of T4-5 , & articular process of lower C3, C4
Insertion: Posterior margin of mastoid process

Acting bilaterally: cervical extension
Acting unilaterally: lateral flexion, and rotation to the same side
Longissiums Cervicus Origin, Insertion and action?
Origin: tendons from TP of T4, T5

Insertion: tendons into posterior tubercles of TP of C2-C6

Acting bilaterally: Cervical extension
Longissimus Thoracis Origin, Insertion and action?
Origin: In lumbar region, it blends with Ilicostalis lumborum; posterior surfaces of TP and accessory process of lumbar vertebrae and thoracolumbar fascia

Insertion: By tendons into tips of TP of all thoracic vertebrae & by fleshy digitations into lower 9-10 ribs between tubercles and angles

Action: Extension and latearl flexion to the same side
Iliocostalis Lumborum Origin, Insertion and action?
Origin: common origin from anterior surface of broad tendon attached to medal crest of sacrum; SP of lumbar & T11, T12; posterior part of medial lip of iliac crest; supraspinous ligament & latearl crests of sacrum

Insertion: By tendons into inferior borders of angles of lower 6,7 ribs

ACtion: extend spine, ipsilatearl flexion and some lateral flexion
Iliocostalis Thoracis Origin, Insertion and action?
Origin: By tendons from upper borders of the angles on the lower 6 ribs

Insertion: Carnial borders of angles of upper 6 ribs & dorsum of TP of C7

Action: Spine extension, latearl flexion to the same side
Iliocostalis Cervicis Origin, Insertion and action?
Origin: Angles of ribs 3-6

Insertion: Posterior tubercles of TP of C4-C6

Action: extends spine; lateral flexion to the same side
Multifidus Origin, Insertion and action?
Origin: Sacral Region: posterior surface of sacrum, medial surface of posterio superior iliac spine & posterior sacroiliac ligaments
Lumbar, Thoracic, Cervical Regions; TP of L5-C4

Insertion: Spanning 2-4 vertebraie, insertion into spinous process of vertebrae above

Action: primary stabilizer of L-spine; Anti- flexion, anti-shear. and spinal extension

Cervical: acting bilatearlly- etension
Acting unilaterally- rotation to the opposite side
Serratus posterior inferior Origin, Insertion and action?
Origin: SP T11, T12 & L1-L3

Insertion: aInferolatearl ribs T9-T12 (ascends laterally)

Action: may elevate ribs in dogs, but role in humans is uncertain.
Rotatores Origin, Insertion and action?
Origin: TP of vertebrae
Insertion: Lamina of vertbrae above

Acting bilaterally: extension
Acting unilaterally: rotation to opposite side
Interspinales Origin, Insertion and action?
Origin/Insertion: between SP's in pairs (only goes one level)

Action: extension in the cervical spine
Intertransversarii Origin, Insertion and Action?
Origin/Insertion: Between Transverse process (onle goes one level)

Action: latearl flexion in cervical
Quadratus Lumborum Origin, Insertion and Action?
Origin: Iliac crest and occasionally TP of L3, L4; iliolumbar lumbar ligament

Insertion: Inferior border of rib 12 and TP of L1-L4

Action: assists in extension, laterally flexes the lumbar vertebral column & depresses the last rib
Bilaterally: acts with diaphragm and fixes the last two ribs during respiration
Splenius Capitis Origin, Insertion and Action?
Origin: Caudal 1/2 of ligamentum nuchae; SP of C7; SP of T1-T3 or T4

Insertion: Mastoid process of temporal bone & occipital bone inferior to lateral 1/3 of superior nuchal line

Action: Rotation to the same side, extension/posterior sagitall rotation
Splenius Cervicis Origin, Insertion and Action?
Origin: spinous process of T3-T6

insertion: posterior tubercles of TP of C1-C2 or C3

Action: extends cervical spine
Masseter Origin, Insertion and Action?
Origin: Zygomatic process of maxilla, lower border of zygomatic arch

Insertion: angle & ramus of mandible(superficial)
superior 1/2 of ramus & lateral surface of coronoid process of mandible (deep)

Action: Elevates the mandible, some small effects on side to side movements, protraction and retraction;
PULLS MOUTH CLOSED
Temporalis Origin, Insertion and Action?
Origin: Temporal fossa & fascia

Insertion: Cornoid process of mandible & anterior border of ramus of mandible

Action: Elevates the mandible (closes jaw)
posterior fibers retrude mandible; and assits in lateral deviation
Medial Pterygoid Origin, Insertion and Action?
Origin: Medial surface of latearl pterygoid plate, pyramidal process of palatine bone & tuberosity of maxilla

Insertion: Inferior & posterior part of medial surface of ramus & angle of mandibular foramen

Action: Elevation (closes jaw), protrusion and deviation to opposte side
Lateral Pterygoid Origin, Insertion and Action?
Origin: (superior head) latearl surface of great wing of spenoid & infratemporal crest
(inferior head): latearl surface of latearl pterygoid plate

Insertion: anterior part of condyle of mandible; anterior margin of articular disk of temporomandibular articulation

Action: Assists in opening mouth and controls backward gliding of disk and condyle during closing; protrusion
Ipsilateral deviation of mandible if acting with temporalis
contralateral deviation of mandbile if acting with Medial pteryoigd
Longus Capitis Origin, Insertion and Action?
Origin: TP C3-C6

Insertion: Occiput

action: upper cervical flexion and head on neck flexion
Longus Colli Origin, Insertion and Action?
Origin/Insertion: TP C3-C5 to C1 anterior arch
Bodies of T1,T2,T3 to TP's of C5, C6
Bodies of C5-C7, T1-T3 to bodies of C2- C4

Action: lower cervical neck flexion
Rectus Capitis Origin, Insertion and Action?
Origin: Root of the TP of atlas

Insertion: Inferior surface of occipital bone

Action: anterior flexion of head on neck (nodding); ipsilateral rotation
Rectus Capitis Posterior Major Origin, Insertion and Action?
Origin: Spine of atlas

Insertion: Inferior nuchal line of occiput

Action: extends head; turns face to same side
Rectus Capitis Posterior Minor Origin, Insertion and Action?
Origin: Tubercle on Poserior arch of atlas

Insertion: Medial inferior nuchal line of occiput

Action: extend and rotate the neck
Oblique Capitis Inferior Origin, Insertion and Action?
Origin: spine of apex of axix passing lateral and upward

Insertion: TP of atlas

Action: rotates head to the same side
Oblique Capitis Superior Origin, Insertion and Action?
Origin: TP of atlas passing upward and backward

Inserition: Occipital bone

Action: extends head and lateral flexion to the same side
Rectus Capitis lateralis Origin, Insertion and Action?
Origin: Superior part of TP of atlas

Inseriton: Jugular process of occipital bone

Action: lateral flexion of head to SAME side
Scalene Anterior Origin, Insertion and Action?
Origin: Anterior part of TP of C3-C6

insertion: 1st rib

action: flex lower cervical vertebrea and lateral bending; elevate 1st rib
Scalene Medius Origin, Insertion and Action?
Origin: TP of C2-C7

Insertion: 1st rib

Action: Lateral bend of C-Spine; elevates 1st rib
Scalene Posterior Origin, Insertion and Action?
Origin: Posterior part of TP of C5-C7

Insertion: 2nd rib

Action: latearl bend of C-spine; elevates 2nd rib
Platysma Origin, Insertion and Action?
Origin: fascia covering superior parts of pectoralis major and deltoid

Insertion: inferior margin of mandible, skin of lower lip of face and corner of mouth

Action: Flex neck
Orbicularis Oculi Origin, Insertion and Action?
Origin: Nasal part of frontal bone, frontal process of maxilla, anterior surface of palpebral ligament
Insertion: muscles surrround circumference of the orbit

Action: close eyelids firmly (orbital part) or gently (palpebral part)
Frontalis Origin, Insertion and Action?
Origin: Galea aponeurotica

Insertin: muscel and skin of eyebrow and root of nose

Actin: raise eyebrows
Nasalis (alar portion:) Origin, Insertion and Action?
Origin: maxilla

Insertion: ala of nose

Action widen the aperture of nostrils (flares the nostrils)
Nasalis (transverse portioN) Origin, Insertion and Action?
Origin: above & lateral to incisive fossa of maxilla

Insertion: by aponeurosis with nasalis on opposite side of maxilla fossa

Action: depress cartilaginous part of nose