Muscle Origin, Insertion, Action -Trunk

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Cuesta College-Human Anatomy (BIO 205)-Fall 2010-Dr. S. Sachs, Instructor

Action of the Spinalis

Trunk extension, rotation, and lateral flexion of vertebral column

Action of the Semispinalis (Thoracis, cervicis, capitis region)

Extends vertebral column

Action of Quadratus lumborum

Flexes vertebral column laterally, pelvic elevation

Action of External intercostals

Pulls ribs toward one another to elevate rib cage

Internal intercostals

Draws ribs together and depress rib cage

Action of the Diaphragm

Prime mover of inspiration; flattens on contraction

Action of External Oblique

Compresses abdominal contents, Trunk rotation and lateral flexion

Action of Sternocleiodomastoid

Flexes and laterally rotates the head

Action of Scalenes (Ant, Mis, Post)

Elevate first two ribs, aid in inspiration

Action of Splenius capitis and cervicis

Extension/ Hyperextension of the head

Action of Erector spinae (3 columns) iliocostalis

Trunk extension, rotation, and lateral flexion of vertebral column

Action of Longissimus

Trunk extension, rotation, and lateral flexion of vertebral column

Action of Internal oblique

Compresses abdominal contents, trunk rotation and lateral flexion

Action of Transversus abdominis

Compresses abdominal contents

Action of Rectus abdominis

Flex and rotate lumbar region of vertebral column

Insertion of Pectoralis major

Fibers converge to insert by a short tendon into lateral side of the intertubercular sulcus of the humerus

Action of Pectoralis major

Prime mover of arm flexion, rotates arm medially, adducts arm

Action of Pectoralis minor

With ribs fixed, draws scapula forward

Action of Serratus anterior

Rotates scapula so that its inferior angle moves laterally and upward, scapular abduction (keeps scapula close to body)

Action of Trapezius I (Upper fibers)

Scapular elevation, scapular upward rotation

Action of Trapezius II (Middle fibers)

Scapular adduction

Action of Trapezius III (Lower fibers)

Scapular depression and upward rotation

Action of Levator scapulae

Elevates/ adducts scapula

Action of Rhomboid major

Scapluar adduction and downward rotation

Action of Rhomboid minor

Action: Stabalizes and adducts scapula

Action of Latissimus dorsi

Prime mover of arm extension, adduction and medial rotation at shoulder

Origin of the Quadratus lumborum

Iliac crest and lumbar fascia

Insertion of the Quadratus lumborum

Transverse processes of upper lumbar vertebrae and lower margin of 12 rib

Innervation of Quadratus lumborum

T12 and upper lumbar spinal nerve (ventral rami) L1-4

Origin of Diaphragm

Inferior internal surface of rib cage and sternum

Insertion of Diaphragm

Central tendon

Innervation of Diaphragm

Phrenic nerve C4

Insertion of Sternocleiodomastoid

Mastoid process and superior nuchal line

Innervation of Sternocleiodomastoid

Accessory CN11

Origin of Sternocleiodomastoid

Manubrium of sternum and medial part of clavicle

Innervation of Pectoralis major

Lateral & medial pectoral nerves C5-8, T1

Origin of Pectoralis major

Sternal end of clavicle, sternum, cartilage of ribs 1-6 and aponeurosis of external oblique;

Insertion of Pectoralis minor

Coracoid process of scapula

Origin of Pectoralis minor

Anterior surface of ribs 3-5 (or 2-4)

Innervation of Pectoralis minor

Medial and lateral perctoral nerves C6-8

Innervation of Serratus anterior

Long thoracic nerve C5-7

Origin of Serratus anterior

Muscle slips from ribs 1-8 or 9

Insertion of Serratus anterior

Entire anterior surface of vertebral border of scapula

Innervation of Trapezius I (Upper fibers)

Accessory nerve C3-4

Origin of Trapezius I (Upper fibers)

Occipital protruberance, spinous processes C1-7

Insertion of Trapezius I (Upper fibers)

Lateral 1/3 of clavicle and acromium of scapula

Origin of Trapezius II (Middle fibers)

Spinous processes T1-5

Insertion of Trapezius II (Middle fibers)

Medial margin of acromion process, superior spine of scapula

Innervation of Trapezius II (Middle fibers)

Accessory nerve C3-4

Origin of Trapezius III (Lower fibers)

Spinous processes T6-12

Insertion of Trapezius III (Lower fibers)

Medial spine of scapula and tubercle at apex of spine and scapula

Innervation of Trapezius III (Lower fibers)

Accessory nerve C3-4

Innervation of Levator scapulae

Dorsal scapular nerve C4-5

Insertion of Levator scapulae

Medial border of scapula, superior to the spine (superior angle of scapula)

Origin of Levator scapulae

Transverse proesses of C1-4

Innervation of Rhomboid major

Dorsal scapular nerve C4-5

Origin of Rhomboid major

Spinous processes of T2-5

Insertion of Rhomboid major

Medial border of scapula

Origin of Rhomboid minor

Ligamentum nuchae and spinous processes C7-T1

Insertion of Rhomboid minor

Medial border of scapula

Innervation of Rhomboid minor

Dorsal scapular nerve C4-5

Origin of Latissimus dorsi

Spinous processes T7-12, thoracolumbar fascia, iliac crest, and inferior 3 or 4 ribs

Insertion of Latissimus dorsi

Intertubercular sulcus of humerus

Innervation of Latissimus dorsi

Thoracodorsal nerve C6-8

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