ANAT 5150: Back, Chest, and Shoulder

Trapezius: Origin (4)

• Superior nuchal line,

• External occipital protuberance,

• Ligamentum nuchae,

• Spinous processes of Cervical Vertebrae.

Trapezius: Insertion (3)

• Lateral clavicle,

• Acromion,

• Scapula spine.

Trapezius: Actions (3,1)

Elevation, retraction, depression of the scapula.

Neck extension.

Latissimus dorsi: Origin (3)

• Spinous processes of T7-T12,

• thoracolumbar fascia

• iliac crest.

Latissimus dorsi: Insertion (1)

Floor of the bicipital groove.

Latissimus dorsi: Actions (3)

Extending, adducting, internally rotating the humerus.

Rhomboid major: Origin (1)

Spinous processes of T2-T5.

Rhomboid major: Insertion (1)

Medial border of the scapula.

Rhomboid major: Actions (2)

Retracting, downwardly rotating the scapula.

Splenius capitis: Origin (1)

Nuchal ligament.

Splenius capitis: Insertion (1)

Mastoid process.

Splenius capitis: Actions (1,2)

Bilateral extension of the head and neck.

Unilateral ipsilateral flexion and rotation.

Iliocostalis cervicis: Origin

Costal angles of ribs 3-6.

Iliocostalis cervicis: Insertion

Transverse processes of C4-C6.

Iliocostalis cervicis: Actions (2)

Extension, ipsilateral flexion of the vertebral column.

Deltoid: Origin

• Lateral one-third of the clavicle (anterior),

• acromion (middle),

• scapular spine (posterior).

Deltoid: Insertion

Deltoid tuberosity of the Humerus.

Deltoid: Actions (2,1,2)

Flexion, internal rotation (anterior).

Abduction (middle).

External rotation (posterior) of the humerus.

Supraspinatus: Origin

Supraspinous fossa.

Supraspinatus: Insertion

Greater tubercle (superior facet).

Supraspinatus: Actions

Initiating abduction of the arm (0–15°).

Levator scapulae: Origin

Transverse processes of C1-C4.

Levator scapulae: Insertion

Medial border of the scapula.

Levator scapulae: Actions (2)

Retraction, downward rotation of the scapula.

Serratus anterior: Origin

Ribs 1-8.

Serratus anterior: Insertion

Medial border of the scapula.

Serratus anterior: Actions (2)

Protracting, upwardly rotating the scapula.

Multifidus: Origin (2)

Sacrum, posterior superior iliac spine.

Multifidus: Actions (2)

Stabilizes the spine during extension and contralateral rotation.

Serratus posterior superior: Origin (2)

• Ligamentum nuchae,

• spinous processes of C7-T3.

Serratus posterior superior: Insertion

Superior borders of ribs 2-5.

Serratus posterior superior: Actions

Elevating the ribs.

Infraspinatus: Origin

Infraspinous fossa

Infraspinatus: insertion

Greater tubercle (middle facet)

Pectoralis major: Origin

• Medial ½ clavicle

• Sternum

Pectoralis major: Insertion

Lateral lip of bicipital groove

Pectoralis minor: Origin

Ribs 3 - 5

Pectoralis minor: Insertion

Coracoid process

Subscapularis: Origin

Subscapular fossa

Subscapularis: Insertion

Lesser tubercle

Teres minor: Origin

Lateral border of scapula

Teres minor: Insertion

Greater tubercle (inferior facet)

Teres major: Origin

Inferior angle of scapula.

Teres major: Insertion

medial lip of bicipital groove.

Rhomboid minor: Origin

• Ligamentum nuchae

• Spinous Process C7 and T1

Rhomboid minor: Insertion

Root of scapular spine (medial border of scapula)

Serratus posterior inferior: Origin

• Spinous Process T11 - L2

• thoracolumbar fascia

Serratus posterior inferior: Insertion

Inferior border Ribs 9-12

Splenius cervicis: Origin

Spinous Process  T3 - T6

Splenius cervicis: Insertion

Transverse Process C1 - C3

Iliocostalis thoracis: Origin

Costal Angle Ribs  7 - 12

Iliocostalis thoracis: Insertion

• Costal Angle Ribs  1 - 6

• Transverse Process C7

Iliocostalis lumborum: Origin

• Lateral sacrum

• Iliac crest

Iliocostalis lumborum: Insertion

Costal Angle Ribs  5 - 12 Transverse Process L1 - L4

Longissimus capitis: origin

Transverse Process C4 - T5

Longissimus capitis: Insertion

Mastoid process.

Longissimus cervicis: Origin

Transverse Process T1 - T5

Longissimus cervicis: Insertion

Transverse Process C2 - C6

Longissimus thoracis: Origin

Transverse Process L1 - L5

Longissimus thoracis: Insertion

Costal Angle Ribs  7 - 12

Spinalis capitis: Origin

Spinous Process C7 - T1

Spinalis capitis: Insertion

Occipital bone

Spinalis cervicis: Origin

Spinous Process  C7 - T1

Spinalis cervicis: Insertion

Spinous Process C2 - C4

Spinalis thoracis: Origin

Spinous Process T11 - L2

Spinalis thoracis: Insertion

Spinous Process T2 - T8