Gross Anatomy Lecture Final

Splenius Capitis Origin:

Ligamentum Nuchae, SP of C7, T3/T4

Splenius Capitis Insertion:

Mastoid process, Superior Nuchal Line

Splenius Capitis Innervation:

Dorsal Rami of Middle Cervical Nerves

Splenius Capitis Blood Supply:

Occipital artery & Superficial Branch of Transverse Cervical Artery

Splenius Capitis Actions:

Ipsilateral Rotation head/neck, Bilateral Extension head/neck

Splenius Cervicis Origin:

SP of T3-T6

Splenius Cervicis Insertion:

TP C1-C2/C3

Splenius Cervicis Innervation:

Dorsal rami of lower cervical nerves

Splenius Cervicis Blood Supply:

Occipital artery & Superficial Branch of Transverse Cervical Artery

Splenius Cervicis Actions:

Ipsilateral Rotation head/neck, Bilateral Extension head/neck

Iliocostalis Lumborum Origin:

Thoracolumbar fascia

Iliocostalis Lumborum Insertion:

Lower 6 ribs at angle

Iliocostalis Lumborum Innervation:

Dorsal rami of lumbar spinal nerves

Iliocostalis Lumborum Blood Supply:

Posterior intercostal arteries, lumbar arteries

Iliocostalis Lumborum Actions:

Extension and lateral flexion of vertebral column

Iliocostalis Thoracis Origin:

Lower 6 ribs medial to insertions of iliocostalis lumborum

Iliocostalis Thoracis Insertion:

Upper 6 ribs (Sometimes TP C7)

Iliocostalis Thoracis Innervation:

Dorsal rami of thoracic spinal nerves

Iliocostalis Thoracis Blood Supply:

Posterior intercostal arteries

Iliocostalis Thoracis Actions:

Extension of the vertebral column

Iliocostalis Cervicis Origin:

Upper 6 ribs medial to the insertion of iliocostalis thoracis

Iliocostalis Cervicis Insertion:

TP C4-C6

Iliocostalis Cervicis Innervation:

Dorsal rami C4-C6

Iliocostalis Cervicis Blood Supply:

Posterior intercostal arteries

Iliocostalis Cervicis Actions:

Extension and lateral flexion of vertebral column

Longissimus Thoracis Origin:

Thoracolumbar fascia, Accessory Process of LV

Longissimus Thoracis Insertion:

TPs of the lower nine TV and lower nine ribs

Longissimus Thoracis Innervation:

Dorsal rami T1-T12

Longissimus Thoracis Blood Supply:

Posterior intercostal and lumbar arteries

Longissimus Thoracis Actions:

Extension and lateral flexion of the vertebral column

Longissimus Cervicis Origin:

TP T1-T4/T6

Longissimus Cervicis Insertion:

TP C2-C6

Longissimus Cervicis Innervation*:

Dorsal rami C4-C8

Longissimus Cervicis Blood Supply*:

Posterior intercostal arteries

Longissimus Cervicis Actions:

Extension and lateral flexion of vertebral column

Longissimus Capitis Origin:

Articular Process of C4-C7

Longissimus Capitis Insertion:

Mastoid process

Longissimus Capitis Innervation*:

Dorsal rami C3-C8

Longissimus Capitis Blood Supply:

Occipital artery & Deep Cervical Branch of Costocervical Trunk

Longissimus Capitis Actions:

Extension of vertebral column, Ipsilateral rotation of head/neck

Spinalis Thoracis Origin:

SP T11-L2

Spinalis Thoracis Insertion:

SP of upper four to eight TV

Spinalis Thoracis Innervation:

Dorsal rami of T1-T12

Spinalis Thoracis Blood Supply:

Posterior intercostal arteries

Spinalis Thoracis Actions:

Extension and lateral flexion of the vertebral column

Semispinalis Capitis Origin:

TP of upper six to seven TV

Semispinalis Capitis Insertion:

Occipital bone between the superior and inferior nuchal lines

Semispinalis Capitis Innervation:

Dorsal rami C1 -C6

Semispinalis Capitis Blood Supply:

Descending branch of occipital artery, deep branch of costocervical trunk

Semispinalis Capitis Actions:

Bilaterally extension, Contralateral rotation of head/neck

Semispinalis Cervicis Origin:

TP of upper five to six thoracic vertebrae

Semispinalis Cervicis Insertion:

SP C2-C5

Semispinalis Cervicis Innervation:

Dorsal rami C6-C8

Semispinalis Cervicis Blood Supply:

Deep branch of costocervical trunk, posterior intercostal arteries

Semispinalis Cervicis Actions:

Bilaterally extension, Contralateral rotation of vertebral column

Semispinalis Thoracis Origin:

TP lower six thoracic vertebrae

Semispinalis Thoracis Insertion:

SP upper thoracic and lower cervical vertebrae

Semispinalis Thoracis Innervation:

Dorsal rami T1-T6

Semispinalis Thoracis Blood Supply:

Posterior intercostal arteries

Semispinalis Thoracis Actions:

Bilaterally extension, Contralateral rotation of vertebral column

Multifidus Origin:

Posterior Sacroiliac Ligament, Mammillary Processes of LV, TPs of TV, Articular Processes of CV

Multifidus Insertion:

SP 2-4 segments superior to origin

Multifidus Innervation:

Dorsal rami of all spinal nerves

Multifidus Blood Supply:

Posterior intercostal and lumbar arteries, deep cervical branch of costocervical trunk

Multifidus Actions:

Extension, lateral flexion, and contralateral rotation of the vertebral column, Extension and lateral motions of the pelvis

Rotatores Brevis/Longus Origin:

TP of vertebrae

Rotatores Brevis Insertion:

Lamina of vertebrae 1 level superior

Rotatores Longus Insertion

Lamina of vertebrae 2 levels superior

Rotatores Brevis/Longus Innervation:

Dorsal rami of spinal nerve

Rotatores Brevis/Longus Blood Supply:

Posterior intercostal and lumbar arteries

Rotatores Brevis/Longus Actions:

Rotation of the vertebral column

Levatores Costarum Brevis/Longus Origin:

TP C7-T11

Levatores Costarum Longus Insertion:

Rib 2 levels below origin

Levatores Costarum Brevis Insertion:

Rib 1 level below origin

Levatores Costarum Brevis/Longus Innervation:

Dorsal rami of thoracic spinal nerves

Levatores Costarum Brevis/Longus Blood Supply:

Posterior intercostal arteries

Levatores Costarum Brevis/Longus Actions:

Elevate ribs, assist in inspiration, rotate, and laterally flex the vertebral column

Interspinales Origin:

SP of vertebrae

Interspinales Insertion:

SP of vertebrae 1 level below origin

Interspinales Innervation:

Dorsal rami of spinal nerves

Interspinales Blood Supply:

Posterior intercostal and lumbar arteries, deep cervical branches of costocervical trunk

Interspinales Actions:

Extension of the vertebral column

Intertransversarii Origin:

TP of vertebrae

Intertransversarii Insertion:

TP of vertebrae 1 level below origin

Intertransversarii Innervation:

Ventral rami of spinal nerves

Intertransversarii Blood Supply:

Posterior intercostal and lumbar arteries

Intertransversarii Actions:

Lateral flexion of the vertebral column

What Muscles form the Suboccipital Triangle?

Rectus Capitis Posterior Major, Obliquus Capitis Superior & Obliquus Capitis Inferior

Contents of Suboccipital Triangle

Vertebral Artery & Suboccipital Nerve

Vertebral Artery & Suboccipital Nerve reside in _____

Groove on C1

Rectus Capitis Posterior Major Origin:

SP of C2

Rectus Capitis Posterior Major Insertion:

Inferior Nuchal Line

Rectus Capitis Posterior Major Innervation:

Suboccipital nerve

Rectus Capitis Posterior Major Blood Supply:

Vertebral artery, descending branch of the occipital artery

Rectus Capitis Posterior Major Actions:

Extend and rotate the head

Rectus Capitis Posterior Minor Origin

Posterior Tubercle of C1

Rectus Capitis Posterior Minor Insertion

Occipital Bone below Inferior Nuchal Line

Rectus Capitis Posterior Minor Innervation

Suboccipital Nerve

Rectus Capitis Posterior Minor Blood Supply

Vertebral artery, descending branch of the occipital artery

Rectus Capitis Posterior Minor Action

Extension and lateral flexion of head