back muscles innervation and blood supply flash cards

Superficial Back Muscles

extrinsic, hypaxial, innervated by ventral rami

What are the Superficial Back Muscles?

trapezius, latissimus dorsi, levator scapulae, romboideus major and minor

Intermediate Back Muscles

extrinsic, hypaxial, innervated by ventral rami

What are the Intermediate Back muscles?

Serratus Posterior Superior and Inferior

Intrinsic (Deep) Back Muscles

epaxial, innervated by dorsal rami

What are the Intrinsic Back Muscles

splenius capitis, splenius cervicis, erector spinae group transversospinalis, segmental muscles

Innervation Trapezius

spinal accessory nerve, ventral rami of third and fourth cervical nerves

Blood Supply Trapezius

superficial branch of the transverse cervical artery

Innervation Latissimus Dorsi

Thoracodorsal nerve (from posterior cord of brachial plexus, containing fibers from C6 to C8)

Blood Supply Latissimus Doris

Thoracodorsal artery

Innervation Levator Scapulae

C3, C4 spinal nerves

dorsal scapular nerve

Blood Supply Levator Scapulae

transverse and ascending cervical arteries

Innervation Romboideus Minor

dorsal scapular nerve (C4, C5)

Blood Supply Romboideus Minor

deep branch of transverse cervical artery

Innervation Romboideus Major

dorsal scapular nerve

Blood Supply Romboideus Major

deep branch of transverse cervical artery

Innervation Serratus Anterior

long thoracic nerve

Blood Supply Serratus Anterior

lateral thoracic artery

Innervation Serratus Posterior Superior

first four intercostal nerves (ventral rami of first 4 thoracic nerves)

Blood Supply Serratus Posterior Superior

segmental supply through intercostal arteries

Innervation Serratus Posterior Inferior

lowest 4 intercostal nerves (ventral rami of lowest 4 thoracic nerves) T9-T12

Blood Suppy Serratus Posterior Inferior

posterior intercostal arteries

Innervation Splenius Capitis

deep cervical artery

occipital artery

Blood Supply Splenius Capitis

Deep cervical artery

occipital artery

Innervation Splenius Cervicis

dorsal rami of lower cervical spinal nerves

Blood Supply of Splenius Cervicis

Deep Cervical Artery

Occipital Artery

Intermediate Layer Intrinsic Back Muscles

Erector Spinae Group

Deep Layer Intrinsic Back Muscles

transversospinalis group (SMR), splenius, erector spinae (ILS), short segmental muscles

Innervation Semispinalis Capitis

medial branches dorsal rami C1-C6

Blood Supply Semispinalis Capitis

Deep cervical artery

post intercostal artery

subcostal artery

lumbar artery

Innervation semispinalis cervicis

medial branches dorsal rami C6-C8

semispinalis thoracis blood supply

posterior intercostal arteries

semispinalis thoracis innervation

dorsal rami T1-T6

Multifidus innervation

dorsal rami spinal nerves

multifidus blood supply

deep cervical artery

post intercostal artery

subcostal artery

lumbar artery

rotatores longus and brevis innervation

dorsal rami spinal nerves

rotatores longus and brevis blood supply

posterior intercostal arteries, lumbar arteries

levatores costarum innervation

dorsal rami thoracic spinal nerves

levatores costarum blood supply

posterior intercostal arteries

interspinales innervation

dorsal rami spinal nerves

interspinales blood supply

muscular branches of posterior intercostal arteries, lumbar arteries, deep cervical branches of costocervical trunk

intertransversarii innervation

posterior/dorsal rami of spinal nerves

intertransversarii blood supply

muscular branches of posterior intercostal arteries and lumbar arteries

rectus capitis posterior minor innervation

suboccipital nerve

rectus capitis posterior minor blood supply

muscular branches vertebral artery, descending branch suboccipital artery

rectus capitis posterior major innervation

suboccipital nerve

rectus capitis posterior major blood supply

muscular branches of vertebral artery, descending branch occipital artery

obliquus capitis superior innervation

suboccipital nerve

obliquus capitis superior blood supply

muscular branches vertebral artery, descending branch occipital artery

obliquus capitis inferior innervation

suboccipital nerve, second cervical dorsal ramus

obliquus capitis inferior blood supply

muscular branches vertebral artery, descending branch occipital artery