Muscles Head/neck and trunk

HN1

100

Scalenes:

-Origin

-Insertion 

-Action

Origin: transverse process of cervical vertebrae

Insertion: ribs 1 and 2

Action: flexes and rotates neck, elevates ribs 1 and 2

3 of them on the sides of neck 

200

Sternocleidomastoid

Origin

Insertion

Action 

Origin: sternum, clavicle

Insertion: mastoid process of temporal bone 

action: abduct, rotates, and flexes head 

300

Platysma 

Origin 

Insertion

Action

Origin: Fascia covering pectoralis major and deltoid

Insertion: Mandible and skin of inferior region of face 

Action: Depresses inferior lip, opens jaw

Large and in front of sterno.  

400

Frontal belly of occipitofrontalis 

Origin

Insertion

Action

O: Galea aponeurotica

I: Subcutaneous Tissue of eyebrow 

A: Raise eyebrows and retracts scalp anteriorly

500

Occipital belly of Occipitofrontalis 

O

I

A

O- occipital bone or temporal bone

I- galea aponeurotica 

A- retract scalp 

HN2

100

Masseter

O

I

A

O: Zygomatic arch

I: Angle and ramus of mandible 

A: Close (elevates)  mandible

200

Orbicular Oculi 

O

I

A

O: Frontal and maxilla on medial margin of orbit

I: Skin of eyelid

A: Close eyelid

300

Orbicular Oris

O

I

A

O: Modiolus of mouth 

I: Skin near lips 

A: closes lips 

400

Zygomaticus 

O

I

A

O: zygomatic bone

I: superolateral angle of mouth and muscles of upper lip

A: Elevates corners of mouth (smiling)

Trunk1

100

External Oblique

O

I

A

O: Ribs 5-12

I: Iliac crest, pubis

A: Compresses abdominal wall, laterally rotates waist 

200

Internal Oblique

O

I

A

O: Inguinal ligament, iliac crest

I: Pubis, ribs 10-12

A: Compresses abdominal wall, laterally rotates waist 

300

Transverse abdominal 

O

I

A

O: Inguinal ligament, iliac crest, costal cartilage 7-12

I: Linea alba, pubis

A: compresses abdominal wall, laterally rotates waist

400

Rectus abdominis 

O

I

A

O: Crest of pubis, pubic symphysis

I: costal cartilage 5-7, xiphoid process

A: flexes spine, compresses abdominal wall

500

External intercostals:

O

I

A

O: Inferior border of ribs 1-11

I: Superior border of rib below 

A: Elevates ribs 

Trunk2

100

internal intercostal

O

I

A

O: superior border of a rib

I: inferior border of next superior rib (2-12)

A: elevates and depresses ribs

200

Diaphragm

O

I

A

O: Xiphoid process, ribs 7-12, superior lumbar vertebrae

I: Central tendon

A: inspiration 

300

Erector spinae:

Name the 3 parts

O

I

A

Iliocostalis, Longissimus, spinalis

O: nuchal ligament, thoracic and lumbar vertebrae, sacrum, ilium, ribs 3-12

I: all ribs, all thoracic vertebrae, temporal bones

A: extends and rotates spine and head 

400

Rhomboid major

O

I

A

O: spines of T2-T5

I: Medial border of scapula 

A: adducts scapula 

500

Rhomboid minor:

O

I

A

 

O: Nuchal ligament, spines C7-T1

I: medial border of scapula 

A: adducts scapula