trunk and thorax Flashcards
trapezius (upper middle and lower) oia
O: external occipital protuberance, medial portion of the superior nuchal line of the occiput, ligamentum nuchae, and spinous processes of c7- t12
I: Lateral 1/3 of clavicle, acromion, and spine of scapula
A: upper: Bilaterally extend head and neck
unilaterally: laterally flex head and neck to same side, rotate head and neck to opposite side, elevate the scapulothoracic joint, upwardly rotate the scapulothoracic joint
Middle: ADduct the scapula (scapulothoracic joint) , stabilze the scapula
Lower: Depress the scapulothoracic joint, upwardly rotate the scapula
Latissimus Dorsi (OIA)
O:inferior angle of the scapula, spinous processes of the last six thoracic vertebrae, last 3 or 4 ribs, throracolumbar fascia, and posterior illiac crest I: intertubecular groove of the humerus A: extend the glenohumeral joint ADduct the glenhumeral joint Medially rotate the glenohumeral joint
Rhomboid Major (OIA)
O: spinous processes of T2-T5
I: medial boarder of the scapula between the spine of the scapula and the inferior angle
A: ADduct the scapula (scapulothoracic joint)
Elevate the scapulothoracic joint
Downwardly rotate the scapula
Rhomboid Minor (OIA)
O: spinous processes of c7 and t1
I: upper portion of medial boarder of the scapula, across from spine of scapula
A: ADduct the scapula (scapulothoracic joint)
Elevate the scapulothoracic joint
Downwardly rotate the scapula
Levator Scapula (OIA)
O: Transverse processes of c1-c4
I: Medial boarder of the scapula, between the superior angle and superior portion of the spine of the scapula
A; Unilaterally: elevate the scapulothoracic joint, Downwardly rotate the scapula, lateraly flex head and neck, rotate head and neck to same side
Bilaterally: extend head and neck
serratus anterior (OIA)
O: external surfaces of upper 8 or 9 ribs
I: anterior surface of medial border of scapula
A: with origin fixed: ABduct the scapula, upwardly rotate the scapula, depress scapula, hold the medial boarder of the scapula against the rib cage
With scapula fixed: May act to elevate the throax during forced inhalation
Pectoralis Major (OIA)
O: Medial half of clavicle, sternum, and cartilage of first through fifth ribs
I: Crest of greater tubercle of Humerus
A: all fibers: ADduct the glenohumeral joint, medially rotate the gh joint, assist to elevate the thorax in force inhalation (with arm fixed)
Upper fibers: flex the glenohumeral joint, horizontally ADduct the gh joint
Lower fibers: Extend the gh joint
Pectoralis Minor oia
O: 3,4,5 ribs
I: medial surface of the coracoid process of the scapula
A: depress the scapulothoracic joint, ABduct the st joint, downwardly rotate the st joint,
With scpaula fixed: assist to elevate the thorax during forced inhalation
three muscles in the erector spinae group
Spinalis
Longissimus
illiocostalis
erector spinae group Actions
Unilaterally: Laterally flex the vertebral column to same side
Bilaterally: extend the vertebral column
multifidis & Rotatores (a, crosses how many joints)
A: Unilaterally: rotate the vertebral column to the opposite side
Bilaterally: extend the vertebral column
multifidi: crosses 4 joints
Rotatores: crosses 2 joints
Quadratus Lumborum (oia)
O: Posterior Illiac crest
I: Last rib and transverse processes of L1-4 Vertebrae
A: Unilaterally: Laterally tilt (elevate) the pelvis, laterally flex the vertebral column to same side
Bilaterally: Fix the last rib during forced inhalation and exhalation, assist to extend the vertebral column
Rectus Abdominis (a only)
Flex the vertebral column
Tilt pelvis posteriorly
External Obliques (a only)
Unilaterally: Laterally flex vertebral column to same side, rotate vertebral column to opposite side
Bilaterally: Flex the vertebral column, Compress abdominal contents
Internal obliques (a only)
Unilaterally: laterally flex vertebral column to same side, rotate vertebral column to same side
Bilaterally: Flex vertebral column , compress abdominal contents
