Class # 8

Spine & Back Muscles

Topics:

24 individual vertebrae:

7 Cervical

12 Thoracic

5 Lumbar

1 Sacrum: 5 fused bones

1 Coccyx: 4 fused bones

Topics:

Vertebral spinous processes and transverse processes

Spinous process: always posterior

Transverse process: 2 projections out of sides

Topics:

Scapula Landmarks:

Spine:

Root of spine (11)

Acromion process/ Lateral end (3)

Coracoid process (4)

Suprascapular notch (15)

Supraglenoid tubercle (9)

Infraglenoid tubercle (8)

Topics:

Occipital bone (EOP) External Occipital Protuberance (p.2)

Temporal bone (mastoid process) (p.235) Clavicle(p.4) Humerus (bicipital groove)(p.6-6)

Muscles of the back: Trapezius (p.69TG)

O:EOPLigamentum nuchae(EOP to Sp.C7)Sp. C7-T12

I:Lateral ClavicleAcromion process(upper)Spine of scapula-middleRoot of spine of scapula-lower

A:Bilaterally upper- Extension of head and neckUnilaterally upper- Lateral flexion of head and neck to same side.Elevation and upward rotation- scapulaRetraction- Middle scapulaDepression and upward rotation- lower scapula

Muscles of the back:

Latissimus dorsiO: Thoracolumbar aponeurosis(flat sheet of connective tissue)Lower 6 thoracic Spinous processesSacrum/Iliac crestLast 3 ribsInferior angle of scapula (covering most of the axillary border)

Muscles of the back:

Latissimus dorsi

I: Bicipital groove of the humerus(medial lip)

A: Medial rotation

Adduction

Extension of humerus at shoulder joint

Muscles of the back:

Teres Major

O: Inferior angle of scapula

Lower third of axillary border of scapula

I: Medial lip of bicipital groove

A: Medial rotation

Adduction

Extension of humerus at shoulder joint

Muscles of the back:

Teres Major performs the exact same actions as latissimus dorsi, together can be called “handcuff muscles”.

(brings your arms into arresting position)

The End!

Here is your class assignment

Great Job!

Quiz next class on back musclesHave a great day