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Spinalis Thoracis Muscle

Spinalis Thoracis Muscle

Author: Scott A. Sheffield MS

Last update: Oct 24th, 2022

The spinalis thoracic muscle is an intrinsic back muscle located at the level of the thorax.

Spinalis Thoracis:

Unlabelled image of the muscles of the back.

Labelled image of the sternocleidomastoid, splenius capitis, splenius cervicis, iliocostalis cervicis, iliocostalis thoracis, external intercostals, longissimus thoracis, iliocostalis lumborum, spinalis thoracis.

Labelled image of the splenius capitis, splenius cervicis, iliocostalis cervicis, iliocostalis thoracis, longissimus thoracis, iliocostalis lumborum, and spinalis thoracis.

Labelled image of the semispinalis capitis, longissimus capitis, spinalis cervicis, splenius cervicis, iliocostalis cervicis, iliocostalis thoracis, longissimus thoracis, iliocostalis lumborum, and spinalis thoracis.

Labelled image of the longissimus capitis, spinalis cervicis, longissimus cervicis, iliocostalis cervicis, iliocostalis thoracis, longissimus thoracis, iliocostalis lumborum, and spinalis thoracis muscles.

Labelled image of the semispinalis capitis, spinalis cervicis, longissimus capitis, spinalis thoracis, and longissimus thoracis muscles

Labelled image of the spinalis cervicis, and spinalis thoracis muscles

Labelled image of the spinalis thoracis.

Muscularis spinalis thoracis.

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Attachments of Spinalis Thoracis: Origin & Insertion

Origin: Spinous processes of T11 (or T10) – L2 (or L3).

Insertion: Spinous processes of T3 (or T1/T2) – T8.

Learning muscle anatomy is no piece of cake! Simplify your studies with this handy muscle anatomy reference chart for the trunk wall.

Unlabelled image of the muscles of the back.

Labelled image of the origin and insertion of the spinalis thoracis.

Origin and insertion of the spinalis thoracis.

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Actions of the Spinalis Thoracis Muscle:

Bilateral action: extends and hyperextends vertebral column (back).

Extensions of the vertebral column animation slide 1

Extensions of the vertebral column animation slide 2

Extensions of the vertebral column animation slide 3

Extensions of the vertebral column animation slide 4

Extension of the vertebral column.

Nerve Supply to Spinalis Thoracis:

dorsal rami of the thoracic and lumbar spinal nerves.

Overview of the Muscles of the Back:

Test yourself image answers hidden.

Test yourself image showing answers: trapezius, deltoid, latissimus dorsi

Test yourself image showing answers: supraspinatus, infraspinatus, teres minor, teres major

Test yourself image showing answers: levetor scapula, rhomboids minor, rhomboids major, serratus anterior

Test yourself image showing answers: serratus anterior superior, serratus posterior inferior

Test yourself image showing answers: sternocleidomastoid, splenius capitis, splenius cervicis, iliocostalis cervicis, iliocostalis thoracis, external intercostals, longissimus thoracis, spinalis thoracis, iliocostalis lumborum

Test yourself image showing answers: Semispinalis cervicis, longissimus cervicis, spinalis cervicis, longissimus cervicis, iliocostalis cervicis, iliocostalis thoracis, longissimus thoracis, iliocostalis lumborum, spinalis thoracis

Test yourself image showing answers: Longissimus capitis, spinalis cervicis, longissimus cervicis, iliocostalis cervicis, iliocostalis thoracis, longissimus thoracis, iliocostalis lumborum, spinalis lumborum

Test yourself image showing answers: Longissimus capitis, spinalis cervicis, longissimus cervicis, spinalis thoracis, longissimus thoracis

Test yourself image showing answers: Spinalis cervicis, spinalis thoracis

Test yourself image showing answers: spinalis thoracis

Test yourself image showing answers: Insertion, and origin

Review the muscles of the back and test yourself.

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