Table 7.2 Muscles Of The Trunk Flashcards by Joslin Roz

Q

Origin of Erector Spinae

A

Vertebrae, pelvis

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Q

Insertion of Erector Spinae

A

Superior vertebrae, ribs

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Q

Action of Errector Spinae

A

Maintains erect posture of vertebral column

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Q

Scalene

A

Scalenus anterior
Scalenus medius
Scalenus posterior

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Q

Origin of scalene

A

Cervical vertebrae

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Q

Insertion of scalene

A

First two ribs

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Q

Action of scalene

A

Raise ribs and expand thorax

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Q

Origin of external intercostals

A

Ribs

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Q

Insertion of external intercostals

A

Next rib

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Q

Action of External intercostals

A

Expand thorax

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Q

Origin of Internal intercostals

A

Ribs

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Q

Insertion of of internal intercostals

A

Next rib

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Q

Action of of Internal intercostals

A

Compress thorax

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Q

Origin of Rectus abdominis

A

Pubis

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Q

Insertion of Rectus abdominis

A

Sternum and 5th and 7th ribs

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Q

Action of Rectus abdominis

A

Flexes vertebral and column increases pressure on abdomen

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Q

Origin of transversus abdominis

A

Last 5 or 6 ribs

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Q

Insertion of transversus abdominis

A

Pubis

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Q

Action of transversus abdominis

A

Compresses abdomen

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Q

Origin of internal oblique

A

Iliac crest

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Q

Insertion of internal oblique

A

Last 3 ribs

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Q

Action of internal oblique

A

Compresses abdomen

Q

Origin of external oblique

A

Last 8 ribs

Q

Insertion of external oblique

A

Iliac crest

Action of external oblique

Compresses abdomen

Origin of Rhomboideus

Vertebrae

Insertion of Rhomboideus

Scapula

Action of Rhomboideus

Retracts Scapula

Origin of Levator scapula

Vertebrae

Insertion of Levator scapula

Scapula

Action of Levator scapula

Raises scapula

Origin of serratus anterior

Ribs

Insertion of serratus anterior

Scapula

Action of serratus anterior

Protracts scapula

Origin of pectoralis major

Clavicle,sternum, first 6 ribs

Insertion of pectoralis major

Greater tubercle of humerus

Action of Pectoralis major

Controls the movement of the arm, adducts and medically rotates arm

Origin of pectoralis minor

Ribs

Insertion of pectoralis minor

Scapula

Action of pectoralis minor

Depresses scapula

Origin of teres major

Scapula

Insertion of teres major

Humerus

Action of teres major

Extends shoulders

Origin of Latissimus dorsi

Vertebrae

Insertion of Latissimus dorsi

Humerus

Action of Latissimus dorsi

Extends shoulders and abducts arm

Origin of supraspinatus

Scapula

Insertion of supraspinatus

Humerus

Action of supraspinatus

Abducts arm

Origin of infraspinatus

Scapula

Insertion of infraspinatus

Humerus

Action of infraspinatus

Extends and rotates arm

Erector spinae

Iliocostalis Longissimus Spinalis