Anatomy Lecture: Back, Suboccipital, and Vert. Column

Trapezius: Innervation? Action?

I: spinal accessory nerve

A: elevates, depresses, and retracts scapula; rotates gleniod superiorly

Latissimus dorsi: Innervation? Action?

I: throracodorsal nerve

A: extends, adducts, and medially rotates shoulder joint

Levator scapulae: Innervation? Action?

I: dorsal scapular and cervical spinal nerves

A: elevates scapula & rotates glenoid cavity inferiorly

Rhomboid major and minor: Innervation? Action?

I: dorsal scapular nerve

A: retracts scapula and rotates glenoid cavity inferiorly

Splenius: Innervation? Action?

I: posterior rami of spinal nerves

A: laterally flex the neck and rotate the head; extend the head and neck

Erector spinae (ILS): Innervation? Action?

I: posterior rami of spinal nerves

A: extend vertebral column and head; laterally flex vertebral column

Semispinalis: Innervation? Action?

I: posterior rami of spinal nerves

A: extend head and thoracic & cervical regions

Multifidus: Innervation? Action?

I: posterior rami of spinal nerves

A: stabilizes vertebrae

Rotatores: Innervation? Action?

I: posterior rami of spinal nerves

A: stabilize vertebrae: local extension and rotatory movements

Interspinales: Innervation? Action?

I: posterior rami of spinal nerves

A: extension and rotation of vertebral column

Intertransversarii: Innervation? Action?

I: posterior and anterior rami of spinal nerves

A: lateral flexion of vertebral column

Levatores costarum: Innervation? Action?

I: posterior rami of C8-T11 spinal nerves

A: elevate ribs, assist with respiration

Thoracolumbar fascia function and location

F: muscle attachment and support

L: lower thoracic and lumbar region

Major function of the Erector spinae muscle group

extensor of the vertebral column

What does the triangular area at the most superior part of the back of the neck allow for?

head movement

Suboccipital triangle: muscle at the superomedial boudnary

rectus captis posterior major

Suboccipital triangle: muscle at the superolateral boundary

obliquus capitis superior

Suboccipital triangle: muscle at the inferolateral boundary

obliquus capitis inferior

Suboccipital triangle: muscle at the most medial point

rectus capitis posterior minor

suboccipital nerve is known as

posterior ramus of C1 spinal nerve

Where does the first spinal (suboccipital) nerve emerge?

from the vertebral canal between the atlas and the vertebral artery