Unit 1 Second Order Anatomy

Trapezius Action

- Elevate and superiorly rotates scapula
- Retracts scapula
- Depress Scapula

Trapezius Innervation

Accessory Nerve

Trapezius Origin

Medial: Occiptal bone, Cervical and Thoracic vertabrae, ligamentum niche

Trapezius Insertion

Lateral: Clavicle & Scapula

Latissimus Dorsi Action

Agonist of arm extension
Adducts and medially rotates arm

Latissimus dorsi innervation

Thoracodorsal nerve

Latissimus dorsi Origin

Proximal: Thoracic vertabrae, ribs 8-12, illiac crest,

Latissimus dorsi insertion

Distal: humerus

Rhomboid major Action

Elevates Scapula
Retracts (adducts) scapula
Inferiorly rotates scapula

Rhomboid major innervation

Dorsal scapular nerve

Rhomboid major origin

Medial: Thoracic vertebrae

Rhomboid major insertion

Lateral: scapula

Teres minor action

Laterally rotates arm (agonist)
Adducts arm

Teres minor innervation

Axillary nerve

Teres minor origin

Proximal: Scapula

Teres minor insertion

Distal: Humerus

Supraspinatus Actions

Abducts arm

Supraspinatus innervation

suprascapular nerve

Supraspinatus origin

Proximal: Scapula

Supraspinatus insertion

Distal: Humerus

Serratus anterior Actions

Agoinst in scapula protraction
Superiorly rotates scapula
Stabilizes scapula

Serratus anterior innervation

long thoracic nerve

Serratus anterior origin

Inferior: Ribs 1-8, anterior and superior margins

Serratus anterior insertion

Superior: Scapula

Subscapularis action

Medially rotates arm

Subscapularis innervation

upper and lower subscapular nerves

Subscapularis origin

Proximal: Scapula

Subscapularis insertion

Distal: humerus

Splenius capitis Actions

Unilateral: Turns heads to same side

Bilateral: Extends neck

Splenius capitis innervation:

cervical spinal nerves

Splenius capitis origin

Inferior: Ligamentum nuchae

Splenius capitis insertion

Superior: Occipital bone & temporal bone

Gluteus maximus actions

- Extends thigh
- Laterally rotates thigh

Gluteus maximus Innervation

Inferior gluteal nerve

Gluteus maximus origin

Proximal: Iliac crest, sacrum, coccyx

Gluteus maximus insertion

Distal: femur, Iliotibial tract

Gluteus medius Actions

- Abducts thigh
- Medially rotates thigh

Gluteus medius innervation

superior gluteal nerve

Gluteus medius origin

Proximal: Iliac crest

Glueteus medius insertion

Distal: femur