HN1
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
Masseter
O
I
A
O: Zygomatic arch
I: Angle and ramus of mandible
A: Close (elevates) mandible
External Oblique
O
I
A
O: Ribs 5-12
I: Iliac crest, pubis
A: Compresses abdominal wall, laterally rotates waist
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
Sternocleidomastoid
Origin
Insertion
Action
Origin: sternum, clavicle
Insertion: mastoid process of temporal bone
action: abduct, rotates, and flexes head
Orbicular Oculi
O
I
A
O: Frontal and maxilla on medial margin of orbit
I: Skin of eyelid
A: Close eyelid
Internal Oblique
O
I
A
O: Inguinal ligament, iliac crest
I: Pubis, ribs 10-12
A: Compresses abdominal wall, laterally rotates waist
Diaphragm
O
I
A
O: Xiphoid process, ribs 7-12, superior lumbar vertebrae
I: Central tendon
A: inspiration
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.
Orbicular Oris
O
I
A
O: Modiolus of mouth
I: Skin near lips
A: closes lips
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
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
Frontal belly of occipitofrontalis
Origin
Insertion
Action
O: Galea aponeurotica
I: Subcutaneous Tissue of eyebrow
A: Raise eyebrows and retracts scalp anteriorly
Zygomaticus
O
I
A
O: zygomatic bone
I: superolateral angle of mouth and muscles of upper lip
A: Elevates corners of mouth (smiling)
Rectus abdominis
O
I
A
O: Crest of pubis, pubic symphysis
I: costal cartilage 5-7, xiphoid process
A: flexes spine, compresses abdominal wall
Rhomboid major
O
I
A
O: spines of T2-T5
I: Medial border of scapula
A: adducts scapula
Occipital belly of Occipitofrontalis
O
I
A
O- occipital bone or temporal bone
I- galea aponeurotica
A- retract scalp
External intercostals:
O
I
A
O: Inferior border of ribs 1-11
I: Superior border of rib below
A: Elevates ribs
Rhomboid minor:
O
I
A
O: Nuchal ligament, spines C7-T1
I: medial border of scapula
A: adducts scapula