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Muscle Origin, Insertion, Action -Trunk

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