Trail Guide to the Body Muscles Questions
With Solutions
Trapezius Upper fibers: bilaterally will extend head and neck; unilaterally will laterally
flex the neck and head to same side, rotate head to opposite side, elevate scapula, and upwardly
rotate scapula
Middle fibers: adduct and stabilize scapula
Lower fibers: depress and upwardly rotate the scapula
O: external occipital protuberance, medial portion of the superior nuchal line or occiput,
ligamentum nuchae, and spinous process of C7-T12
I: lateral 1/3 of clavicle, acromion, and spine of scap
N: spinal portion of cranial nerve XI (accessory) and ventral ramus C2-4
Lat Dorsi A: extend, adduct and medially rotate the shoulder
O: inferior angle of scapula, spinous processes of last 6 thoracic vert, last 3 or 4 ribs,
thoracolumbar aponeurosis and posterior iliac crest
I: intertubercular groove of humber
N: thoracodorsal: C6-C8
Teres major A: extend, adduct and medially rotate shoulder
, Trail Guide to the Body Muscles Questions
With Solutions
O: inferior angle and lower 1/3 of lateral border of scapula
I: crest of lesser tubercle of humerus
N: lower subscapular C5-C7
Supraspinatus A: abduct shoulder and stabilize head of humerus in glenoid cavity
O: supraspinous fossa of scapula
I: greater tubercle of humerus
N: suprascapular C4-C6
Infraspinatus A: laterally rotate and adduct shoulder and stabilize head of humerus in
glenoid cavity
O: infraspinous fossa of scapula
I: greater tubercle of humerus
O: suprascapular C4-C6
Teres minor A: laterally rotate and adduct shoulder and stabilize head of humerus in
glenoid cavity
O: upper 2/3 of the lateral border of scapula
, Trail Guide to the Body Muscles Questions
With Solutions
I: greater tubercle of humerus
N: axillary C5-C6
Subscapularis A: medially rotate shoulder and stabilize head of humerus in glenoid cavity
O: subscapular fossa of scap
I: lesser tubercle of humerus
N: upper and lower subscapular C5-C7
Rhomboid major A: adduct, elevate, and downwardly rotate scapula
O: spinous processes of T2-T5
I: medial border of scapula b/n spine of scapula and inferior angle
N: dorsal scapular: C4-5
Rhomboid minor A: adduct, elevate, and downwardly rotate scapula
O: spinous processes of C7-T1
I: upper portion of medial border of scapula across from spine of scapular
N: dorsal scapular C4-C5
, Trail Guide to the Body Muscles Questions
With Solutions
Erector Spinae Group A: unilaterally flex the vert column to the same side and bilaterally
extend the vertebral column
O: common tendon that attaches to the posterior surface of sacrum, iliac crest, spinous processes
of lumbar and last two thoracic vertebrae
I: various attachments at the posterior ribs, spinous processes and transverse processes of
thoracic and cervical vertebrae, mastoid process of temporal bone
N: spinal nerve
Serratus Posterior Superior A: elevate the ribs during inspiration
O: SP of C7-T3
I: Posterior surface of 2-5 ribs
N: T1-4
Spinalis Cervicis A: unilaterally flex vertebral column to same side and bilaterally extend
O: ligamentum nuchae and SP of C7
I: SP of cervical vertebrae except C1
N: spinal
With Solutions
Trapezius Upper fibers: bilaterally will extend head and neck; unilaterally will laterally
flex the neck and head to same side, rotate head to opposite side, elevate scapula, and upwardly
rotate scapula
Middle fibers: adduct and stabilize scapula
Lower fibers: depress and upwardly rotate the scapula
O: external occipital protuberance, medial portion of the superior nuchal line or occiput,
ligamentum nuchae, and spinous process of C7-T12
I: lateral 1/3 of clavicle, acromion, and spine of scap
N: spinal portion of cranial nerve XI (accessory) and ventral ramus C2-4
Lat Dorsi A: extend, adduct and medially rotate the shoulder
O: inferior angle of scapula, spinous processes of last 6 thoracic vert, last 3 or 4 ribs,
thoracolumbar aponeurosis and posterior iliac crest
I: intertubercular groove of humber
N: thoracodorsal: C6-C8
Teres major A: extend, adduct and medially rotate shoulder
, Trail Guide to the Body Muscles Questions
With Solutions
O: inferior angle and lower 1/3 of lateral border of scapula
I: crest of lesser tubercle of humerus
N: lower subscapular C5-C7
Supraspinatus A: abduct shoulder and stabilize head of humerus in glenoid cavity
O: supraspinous fossa of scapula
I: greater tubercle of humerus
N: suprascapular C4-C6
Infraspinatus A: laterally rotate and adduct shoulder and stabilize head of humerus in
glenoid cavity
O: infraspinous fossa of scapula
I: greater tubercle of humerus
O: suprascapular C4-C6
Teres minor A: laterally rotate and adduct shoulder and stabilize head of humerus in
glenoid cavity
O: upper 2/3 of the lateral border of scapula
, Trail Guide to the Body Muscles Questions
With Solutions
I: greater tubercle of humerus
N: axillary C5-C6
Subscapularis A: medially rotate shoulder and stabilize head of humerus in glenoid cavity
O: subscapular fossa of scap
I: lesser tubercle of humerus
N: upper and lower subscapular C5-C7
Rhomboid major A: adduct, elevate, and downwardly rotate scapula
O: spinous processes of T2-T5
I: medial border of scapula b/n spine of scapula and inferior angle
N: dorsal scapular: C4-5
Rhomboid minor A: adduct, elevate, and downwardly rotate scapula
O: spinous processes of C7-T1
I: upper portion of medial border of scapula across from spine of scapular
N: dorsal scapular C4-C5
, Trail Guide to the Body Muscles Questions
With Solutions
Erector Spinae Group A: unilaterally flex the vert column to the same side and bilaterally
extend the vertebral column
O: common tendon that attaches to the posterior surface of sacrum, iliac crest, spinous processes
of lumbar and last two thoracic vertebrae
I: various attachments at the posterior ribs, spinous processes and transverse processes of
thoracic and cervical vertebrae, mastoid process of temporal bone
N: spinal nerve
Serratus Posterior Superior A: elevate the ribs during inspiration
O: SP of C7-T3
I: Posterior surface of 2-5 ribs
N: T1-4
Spinalis Cervicis A: unilaterally flex vertebral column to same side and bilaterally extend
O: ligamentum nuchae and SP of C7
I: SP of cervical vertebrae except C1
N: spinal
