CHI 109 Spinal and Chest muscles

CHI 109Lab 6

Pectoralis Major

L: Clavicular head: medial half of clavicle → Lateral lip of bicipital groove

Sternocostal head: Sternum, upper costal cartilage of rib 1-6 → Lateral lip of bicipital groove

F: Adducts, medially rotates humerus. Flexes humerus (Clavicular), Extends humerus (Sternocostal)

Pectoralis Minor

L: Anterior surface of sternal ends of ribs 3-5 → Coracoidal process

F: Assists scapular protraction, downward rotation and stabilization. Rib elevation.

Trapezius

L: Upper: Nuchal line, Ext.Occ. protuberance → lateral third of clavicle

F: Elevates scapula, upwardly rotates scapula, bilaterally extends neck

Middle: Spinous process of C7-T4 → Scapula spine and Acromion

F: Adduct scapula

Lower: Spinous process of T4-T12 → Medial part of scapula spine

F: Depress scapula, upward rotation assistance

Rhomboid Major

L: Spinous process T2-5 → Medial border of scapula

F: scapular; retraction, elevation, downward rotation, and stabilization.

Rhomboid Minor

L: Spinous process C7-T1 → Medial border of scapular above spine

F: scapular; retraction, elevation, downward rotation, and stabilization.

Latissimus Dorsi

L: Spinous process T6/7-L5, Iliac crest, Thoracolumbar fascia, inferior angle of scapula → Floor of bicipital groove

F: Humerus; adduction, extension and internal rotation

Erector spinae group (Spinalis)

Broad locational group knowledge expected*

-Spinalis Cervicis muscle

-Spinalis Thoracis muscle

Most medial to spine

L: Spinous process of lower vertebrae T11-L2 → Spinous process of upper vertebrae

F: extension and lateral flexion of vertebral column (Mainly thoracic and cervical region)

I I I(spine)I I I

Erector spinae group (Longissimus)

Broad locational group knowledge expected*

-Longissimus Capitis muscle

-Longissimus Cervicis muscle

-Longissimus Thoracis muscle

intermediate and largest to spine of erector spinae group

L: Common tendon from iliac crest, sacrum and lumbar vertebrae → Transverse process of thoracic and cervical vertebrae, mastoid process (L. capitis)

F: Extension and lateral flexion of vertebral column and head

I I I (spine) I I I

Erector spinae group (Illiocostalis)

Broad locational group knowledge expected*

-Iliocostalis Cervicis muscle

-Iliocostalis Thoracis muscle

-Iliocostalis Lumborum muscle

Most lateral to spine of erector spinae group

L: Iliac crest, sacrum → Ribs and transverse process of cervical vertebrae

F: Spine; extension, flexion and posture maintenance

I I I (spine) I I I

Transversospinalis (Multifidus)

Broad locational group knowledge expected*

Deep, Focusing on lower back

Spans Sacrum → cervical spine

F: Spinal stability, spinal; extension, contralateral rotation and lateral flexion

Transversospinalis (Semispinalis)

capatis focus*

L: T6-7 transverse process → Between superior and inferior nuchal lines of occipital bone

F: Head and spine extension, stability and contralateral rotation of vertebral column