Back muscles: origin, insertion, action & innervation

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Iliocostalis: action

Extends the vertebral column

Latissimus dorsi: action

action: adducts, extends the arm

Serratus posterior inferior: action

action: depresses ribs (9-12)

Levator scapulae: action

action: elevates and laterally flexes the scapula

Serratus posterior superior: action

action: elevates ribs (2-5)

Trapezius: action

action: elevates, retracts & rotates the scapula

Rhomboid major: action

action: retract, downwardly rotates the scapula

Rhomboid minor: action

action: retract, downwardly rotates the scapula

Splenius cervicis: action

action: rotates and extends the head

Semispinalis capitis: action

action: rotates, extends head and neck

Splenius capitis: action

action: rotates, extends the head

Which muscles cover the serratus posterior superior muscles?

covered by: Trapezius & Rhomboid muscles

What three back muscles are innervated by the dorsal scapular nerve?

innervated by same nerve: Rhomboid major, Rhomboid minor, Levator Scapulae

Trapezius: innervation

innervation: Accessory nerve

Semispinalis capitis: innervation

innervation: dorsal rami spinal nerve

Splenius capitis: innervation

innervation: dorsal rami spinal nerve

Splenius cervisis: innervation

innervation: dorsal rami spinal nerve

Levator scapulae: innervation

innervation: dorsal scapular nerve

Rhomboid major: innervation

innervation: dorsal scapular nerve

Rhomboid minor: innervation

innervation: dorsal scapular nerve

Latissimus dorsi: innervation

innervation: thoracodorsal nerve

Serratus posterior inferior: innervation

innervation: ventral rami spinal nerve

Serratus posterior superior: innervation

innervation: ventral rami spinal nerve

Trapezius: insertion

insertion: clavicle & scapular spine

Latissimus dorsi: insertion

insertion: intertubercular sulcus of the humerus

Serratus posterior inferior: insertion

insertion: lower border of ribs 9-12

Splenius capitis: insertion

insertion: mastoid process

Longissimus: insertion

insertion: mastoid process of skull; lower 9 ribs

Semispinalis capitis: insertion

insertion: occipital bone

Iliocostalis: insertion

insertion: posterior surface of ribs

Rhomboid major: insertion

insertion: scapula (medial border)

Rhomboid minor: insertion

insertion: scapula (medial border)

Spinalis: insertion

insertion: spinous process of thoracic vertebrae & skull

Splenius cervicis: insertion

insertion: transverse process C1-C4

Serratus posterior superior: insertion

insertion: upper border of ribs 2-5

Levator scapulae: insertion

insertion: upper border of scapula

Trapezius: origin

origin: Occipital bone, spines of all thoracic vertebrae

Serratus posterior superior: origin

origin: SA: Nuchal ligament, C7-T3

Rhomboid major: origin

origin: Spinous process T2-T5

Latissimus dorsi: origin

origin: Spinous process T7-Sacrum, iliac crest

Rectus capitis posterior minor: origin, insertion, action, innervation

origin: posterior tubercle of atlas insertion: occipital bone action: extends the head innervation: suboccipital nerve

Iliocostalis: origin

origin: sacrum

Multifidus: origin, insertion, action, innervation

origin: sacrum insertion: spinous process of L5-C2 action: extends vertebral column innervation: dorsal rami spinal nerve

Splenius cervicis: origin

origin: spines of T1-T6; nuchal ligament

Rectus capitis posterior major: origin, insertion, action, innervation

origin: spinous process C2 insertion: occipital bone action: extends the head innervation: suboccipital nerve

Inferior oblique: origin, insertion, action, innervation

origin: spinous process C2 insertion: transverse process C1 action: rotates the head innervation: suboccipital nerve

Rhomboid minor: origin

origin: spinous process of T1

Splenius capitis : origin

origin: spinous processes of T1-T6; nuchal ligament

Serratus posterior inferior: origin

origin: spinous processes of T11-L3

Superior oblique: origin, insertion, action, innervation

origin: transverse process C1 insertion: occipital bone action: extends the head innervation: suboccipital nerve

Levator scapulae: origin

origin: transverse process C1-C4

Semispinalis capitis: origin

origin: transverse process of T1-T6

Rotatores: origin, insertion, action, innervation

origin: transverse process of vertebrae insertion: spinous process of superior vertebrae action: extends vertebral column innervation: dorsal rami spinal nerve

Lavatories costarum: origin, insertion, action, innervation

origin: transverse processes of C7-T11 insertion: the rib inferior to each vertebrae action: elevates the ribs innervation: dorsal rami spinal nerve

Which two back muscles retract, rotate, and fix the scapula to the body wall?

same action: Rhomboid major & Rhomboid minor

The scapula is the insertion point for these two back muscles

same insertion point: Rhomboid minor, Rhomboid major

These two back muscles have the same origin (C7-T3/4 & nuchal ligament), action (head & neck extension, ipsilateral flection & rotation) and innervation (dorsal rami spinal nerve).

same origin, action & innervation: Splenius capitis & Splenius cervisis


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