Scalene Muscle Anatomy Animation

Video Description

http://www.medilaw.tv Cervical Spine Muscles Scalenes chiropractor 3D animation. Shows anterior and lateral views during anterior, lateral and posterior scalene contraction and relaxation.

1. SCALENUS ANTERIOR, ANTERIOR SCALENE, SCALENUS ANTICUS
DESCRIPTION
Scalenus anterior is one three deep muscles in the scalene group.

ORIGIN
Scalenus anterior originates from the anterior tubercles of the transverse processes of the third, fourth, fifth and sixth cervical vertebrae. Cervical Spine Muscles Scalenes chiropractor 3D animation.

INSERTION
Scalenus anterior inserts onto the scalene tubercle on the inner border of the first rib, and to a ridge on the upper surface of the rib, anterior to the groove for the subclavian artery.

INNERVATION
Scalenus anterior is innervated by branches from the ventral rami of C4, C5 and C6 spinal nerves.

BLOOD SUPPLY
Scalenus anterior is supplied by the inferior thyroid artery, a branch of the thyrocervical trunk.

ACTION
Scalenus anterior flexes and laterally flexes the neck.
Scalenus anterior assists in rotation of the head to the contralateral side.
Scalenus anterior elevates the first rib when the neck is fixed.

FUNCTION
Scalenus anterior assists with inspiration.



2. SCALENUS MEDIUS, MIDDLE SCALENE
Cervical Spine Muscles Scalenes chiropractor 3D animation.
DESCRIPTION
Scalenus medius is one three deep muscles in the scalene group.

ORIGIN
Scalenus medius originates from the transverse process of the axis and the front of the posterior tubercles of the transverse processes of the lower five cervical vertebrae.

INSERTION
Scalenus medius inserts onto the upper surface of the first rib, between the tubercle and the groove for the subclavian artery.

VARIATIONS
Scalenus medius often extends up to the transverse process of the atlas.

INNERVATION
Scalenus medius is innervated by branches from the ventral rami of C3 to C8 spinal nerves.

BLOOD SUPPLY
Scalenus medius is supplied by the ascending cervical artery.

ACTION
Scalenus medius laterally flexes the neck to the ipsilateral side when the first rib is fixed.
Scalenus medius assists in rotation of the head to the contralateral side.
Scalenus medius elevates the first rib when the neck is fixed.

FUNCTION
Scalenus medius assists with inspiration.



3. SCALENUS POSTERIOR, POSTERIOR SCALENE
Cervical Spine Muscles Scalenes chiropractor 3D animation.
DESCRIPTION
Scalenus posterior is one three deep muscles in the scalene group.

ORIGIN
Scalenus posterior originates from the posterior tubercules of the transverse processes of the fourth, fifth and sixth cervical vertebrae.

INSERTION
Scalenus posterior inserts onto the outer surface of the second rib, behind the tubercle for serratus anterior.

VARIATIONS
Scalenus posterior is occasionally blended with scalenus medius.

INNERVATION
Scalenus posterior is innervated by branches from the ventral rami of C6, C7 and C8 spinal nerves.

BLOOD SUPPLY
Scalenus posterior is supplied by the ascending cervical artery.

ACTION
Scalenus posterior flexes and laterally flexes the lower neck to the ipsilateral side when the second rib is fixed.
Scalenus posterior assists in rotation of the head to the contralateral side.
Scalenus posterior elevates the second rib when the neck is fixed.

FUNCTION
Scalenus posterior assists with inspiration.